[svn-r14903] Undoing change committed in r14902.

1 files changed, 1446 insertions, 0 deletions

diff --git a/perform/sio_perf.c b/perform/sio_perf.c
new file mode 100644
index 0000000..9e5ed23
--- /dev/null
+++ b/perform/sio_perf.c
@@ -0,0 +1,1446 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the files COPYING and Copyright.html.  COPYING can be found at the root   *
+ * of the source code distribution tree; Copyright.html can be found at the  *
+ * root level of an installed copy of the electronic HDF5 document set and   *
+ * is linked from the top-level documents page.  It can also be found at     *
+ * http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html.  If you do not have     *
+ * access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * Serial HDF5 Performance Testing Code
+ * --------------------------------------
+ *
+ * Portable code to test performance on the different platforms we support.
+ * This is what the report should look like:
+ *
+ *  nprocs = Max#Procs
+ *      IO API = POSIXIO
+ *          # Files = 1, # of dsets = 1000, Elements per dset = 37000
+ *              Write Results = x MB/s
+ *              Read Results = x MB/s
+ *          # Files = 1, # of dsets = 3000, Elements per dset = 37000
+ *              Write Results = x MB/s
+ *              Read Results = x MB/s
+ *
+ *          . . .
+ *
+ *
+ *      IO API = HDF5
+ *          # Files = 1, # of dsets = 1000, Elements per dset = 37000
+ *              Write Results = x MB/s
+ *              Read Results = x MB/s
+ *          # Files = 1, # of dsets = 3000, Elements per dset = 37000
+ *              Write Results = x MB/s
+ *              Read Results = x MB/s
+ *
+ *          . . .
+ *
+ *
+ *      . . .
+ *
+ */
+
+/* system header files */
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "hdf5.h"
+
+
+/* our header files */
+#include "sio_perf.h"
+
+/* useful macros */
+#define TAB_SPACE           4
+
+#define ONE_KB              1024
+#define ONE_MB              (ONE_KB * ONE_KB)
+#define ONE_GB              (ONE_MB * ONE_KB)
+
+#define SIO_POSIX           0x1
+#define SIO_HDF5            0x4
+
+/* report 0.0 in case t is zero too */
+#define MB_PER_SEC(bytes,t) (((t)==0.0) ? 0.0 : ((((double)bytes) / ONE_MB) / (t)))
+
+#ifndef TRUE
+#define TRUE    1
+#endif  /* TRUE */
+#ifndef FALSE
+#define FALSE   (!TRUE)
+#endif  /* FALSE */
+
+/* global variables */
+FILE       *output;             /* output file                          */
+int         sio_debug_level = 0;/* The debug level:
+                                 *   0 - Off
+                                 *   1 - Minimal
+                                 *   2 - Some more
+                                 *   3 - Maximal
+                                 *   4 - Maximal & then some
+                                 */
+
+/* local variables */
+static const char  *progname = "h5perf_serial";
+
+/*
+ * Command-line options: The user can specify short or long-named
+ * parameters. The long-named ones can be partially spelled. When
+ * adding more, make sure that they don't clash with each other.
+ */
+
+/*
+ * It seems that only the options that accept additional information
+ * such as dataset size (-e) require the colon next to it.
+ */
+#if 1
+static const char *s_opts = "a:A:B:c:Cd:D:e:F:ghi:Imno:p:P:r:stT:v:wx:X:";
+#else
+static const char *s_opts = "a:A:bB:c:Cd:D:e:F:ghi:Imno:p:P:r:stT:wx:X:";
+#endif  /* 1 */
+static struct long_options l_opts[] = {
+    { "align", require_arg, 'a' },
+    { "alig", require_arg, 'a' },
+    { "ali", require_arg, 'a' },
+    { "al", require_arg, 'a' },
+    { "api", require_arg, 'A' },
+    { "ap", require_arg, 'A' },
+#if 0
+    /* a sighting of the elusive binary option */
+    { "binary", no_arg, 'b' },
+    { "binar", no_arg, 'b' },
+    { "bina", no_arg, 'b' },
+    { "bin", no_arg, 'b' },
+    { "bi", no_arg, 'b' },
+#endif  /* 0 */
+    { "block-size", require_arg, 'B' },
+    { "block-siz", require_arg, 'B' },
+    { "block-si", require_arg, 'B' },
+    { "block-s", require_arg, 'B' },
+    { "block-", require_arg, 'B' },
+    { "block", require_arg, 'B' },
+    { "bloc", require_arg, 'B' },
+    { "blo", require_arg, 'B' },
+    { "bl", require_arg, 'B' },
+    { "chunk", no_arg, 'c' },
+    { "chun", no_arg, 'c' },
+    { "chu", no_arg, 'c' },
+    { "ch", no_arg, 'c' },
+    { "collective", no_arg, 'C' },
+    { "collectiv", no_arg, 'C' },
+    { "collecti", no_arg, 'C' },
+    { "collect", no_arg, 'C' },
+    { "collec", no_arg, 'C' },
+    { "colle", no_arg, 'C' },
+    { "coll", no_arg, 'C' },
+    { "col", no_arg, 'C' },
+    { "co", no_arg, 'C' },
+    { "debug", require_arg, 'D' },
+    { "debu", require_arg, 'D' },
+    { "deb", require_arg, 'D' },
+    { "de", require_arg, 'D' },
+    { "file-driver", require_arg, 'v' },
+    { "file-drive", require_arg, 'v' },
+    { "file-driv", require_arg, 'v' },
+    { "file-dri", require_arg, 'v' },
+    { "file-dr", require_arg, 'v' },
+    { "file-d", require_arg, 'v' },
+    { "file-", require_arg, 'v' },
+    { "file", require_arg, 'v' },
+    { "fil", require_arg, 'v' },
+    { "fi", require_arg, 'v' },
+    { "geometry", no_arg, 'g' },
+    { "geometr", no_arg, 'g' },
+    { "geomet", no_arg, 'g' },
+    { "geome", no_arg, 'g' },
+    { "geom", no_arg, 'g' },
+    { "geo", no_arg, 'g' },
+    { "ge", no_arg, 'g' },
+    { "help", no_arg, 'h' },
+    { "hel", no_arg, 'h' },
+    { "he", no_arg, 'h' },
+    { "interleaved", require_arg, 'I' },
+    { "interleave", require_arg, 'I' },
+    { "interleav", require_arg, 'I' },
+    { "interlea", require_arg, 'I' },
+    { "interle", require_arg, 'I' },
+    { "interl", require_arg, 'I' },
+    { "inter", require_arg, 'I' },
+    { "inte", require_arg, 'I' },
+    { "int", require_arg, 'I' },
+    { "in", require_arg, 'I' },
+    { "max-num-processes", require_arg, 'P' },
+    { "max-num-processe", require_arg, 'P' },
+    { "max-num-process", require_arg, 'P' },
+    { "max-num-proces", require_arg, 'P' },
+    { "max-num-proce", require_arg, 'P' },
+    { "max-num-proc", require_arg, 'P' },
+    { "max-num-pro", require_arg, 'P' },
+    { "max-num-pr", require_arg, 'P' },
+    { "max-num-p", require_arg, 'P' },
+    { "min-num-processes", require_arg, 'p' },
+    { "min-num-processe", require_arg, 'p' },
+    { "min-num-process", require_arg, 'p' },
+    { "min-num-proces", require_arg, 'p' },
+    { "min-num-proce", require_arg, 'p' },
+    { "min-num-proc", require_arg, 'p' },
+    { "min-num-pro", require_arg, 'p' },
+    { "min-num-pr", require_arg, 'p' },
+    { "min-num-p", require_arg, 'p' },
+    { "max-xfer-size", require_arg, 'X' },
+    { "max-xfer-siz", require_arg, 'X' },
+    { "max-xfer-si", require_arg, 'X' },
+    { "max-xfer-s", require_arg, 'X' },
+    { "max-xfer", require_arg, 'X' },
+    { "max-xfe", require_arg, 'X' },
+    { "max-xf", require_arg, 'X' },
+    { "max-x", require_arg, 'X' },
+    { "min-xfer-size", require_arg, 'x' },
+    { "min-xfer-siz", require_arg, 'x' },
+    { "min-xfer-si", require_arg, 'x' },
+    { "min-xfer-s", require_arg, 'x' },
+    { "min-xfer", require_arg, 'x' },
+    { "min-xfe", require_arg, 'x' },
+    { "min-xf", require_arg, 'x' },
+    { "min-x", require_arg, 'x' },
+    { "mpi-posix", no_arg, 'm' },
+    { "mpi-posi", no_arg, 'm' },
+    { "mpi-pos", no_arg, 'm' },
+    { "mpi-po", no_arg, 'm' },
+    { "mpi-p", no_arg, 'm' },
+    { "mpi-", no_arg, 'm' },
+    { "mpi", no_arg, 'm' },
+    { "mp", no_arg, 'm' },
+    { "num-bytes", require_arg, 'e' },
+    { "num-byte", require_arg, 'e' },
+    { "num-byt", require_arg, 'e' },
+    { "num-by", require_arg, 'e' },
+    { "num-b", require_arg, 'e' },
+    { "num-dsets", require_arg, 'd' },
+    { "num-dset", require_arg, 'd' },
+    { "num-dse", require_arg, 'd' },
+    { "num-ds", require_arg, 'd' },
+    { "num-d", require_arg, 'd' },
+    { "num-files", require_arg, 'F' },
+    { "num-file", require_arg, 'F' },
+    { "num-fil", require_arg, 'F' },
+    { "num-fi", require_arg, 'F' },
+    { "num-f", require_arg, 'F' },
+    { "num-iterations", require_arg, 'i' },
+    { "num-iteration", require_arg, 'i' },
+    { "num-iteratio", require_arg, 'i' },
+    { "num-iterati", require_arg, 'i' },
+    { "num-iterat", require_arg, 'i' },
+    { "num-itera", require_arg, 'i' },
+    { "num-iter", require_arg, 'i' },
+    { "num-ite", require_arg, 'i' },
+    { "num-it", require_arg, 'i' },
+    { "num-i", require_arg, 'i' },
+    { "order", require_arg, 'r' },
+    { "orde", require_arg, 'r' },
+    { "ord", require_arg, 'r' },
+    { "or", require_arg, 'r' },
+    { "output", require_arg, 'o' },
+    { "outpu", require_arg, 'o' },
+    { "outp", require_arg, 'o' },
+    { "out", require_arg, 'o' },
+    { "ou", require_arg, 'o' },
+    { "extendable", no_arg, 't' },
+    { "extendabl", no_arg, 't' },
+    { "extendab", no_arg, 't' },
+    { "extenda", no_arg, 't' },
+    { "extend", no_arg, 't' },
+    { "exten", no_arg, 't' },
+    { "exte", no_arg, 't' },
+    { "ext", no_arg, 't' },
+    { "ex", no_arg, 't' },
+    { "threshold", require_arg, 'T' },
+    { "threshol", require_arg, 'T' },
+    { "thresho", require_arg, 'T' },
+    { "thresh", require_arg, 'T' },
+    { "thres", require_arg, 'T' },
+    { "thre", require_arg, 'T' },
+    { "thr", require_arg, 'T' },
+    { "th", require_arg, 'T' },
+    { "write-only", require_arg, 'w' },
+    { "write-onl", require_arg, 'w' },
+    { "write-on", require_arg, 'w' },
+    { "write-o", require_arg, 'w' },
+    { "write", require_arg, 'w' },
+    { "writ", require_arg, 'w' },
+    { "wri", require_arg, 'w' },
+    { "wr", require_arg, 'w' },
+    { NULL, 0, '\0' }
+};
+
+struct options {
+    long io_types;              /* bitmask of which I/O types to test   */
+    const char *output_file;    /* file to print report to              */
+    long num_dsets;             /* number of datasets                   */
+    long num_files;             /* number of files                      */
+    off_t num_bpp;              /* number of bytes per proc per dset    */
+    int num_iters;              /* number of iterations                 */
+    off_t dset_size[MAX_DIMS];  /* Dataset size                           */
+    size_t buf_size[MAX_DIMS];  /* Buffer size                           */
+    size_t chk_size[MAX_DIMS];  /* Chunk size                           */
+    int order[MAX_DIMS];  /* Dimension access order                           */
+    int dset_rank;             /* Rank                   */
+    int buf_rank;             /* Rank                   */
+    int order_rank;             /* Rank                   */
+    int chk_rank;             /* Rank                   */
+    int print_times;       	/* print times as well as throughputs   */
+    int print_raw;         	/* print raw data throughput info       */
+    off_t h5_alignment;         /* alignment in HDF5 file               */
+    off_t h5_threshold;         /* threshold for alignment in HDF5 file */
+    int h5_use_chunks;     	/* Make HDF5 dataset chunked            */
+    int h5_write_only;        	/* Perform the write tests only         */
+    int h5_extendable;        	/* Perform the write tests only         */
+    unsigned h5_use_mpi_posix;  /* Use MPI-posix VFD for HDF5 I/O (instead of MPI-I/O VFD) */
+    int verify;        		/* Verify data correctness              */
+    vfdtype     vfd;            /* File driver */
+
+};
+
+typedef struct _minmax {
+    double min;
+    double max;
+    double sum;
+    int num;
+} minmax;
+
+/* local functions */
+static off_t parse_size_directive(const char *size);
+static struct options *parse_command_line(int argc, char *argv[]);
+static void run_test_loop(struct options *options);
+static int run_test(iotype iot, parameters parms, struct options *opts);
+static void output_all_info(minmax *mm, int count, int indent_level);
+static void get_minmax(minmax *mm, double val);
+static minmax accumulate_minmax_stuff(minmax *mm, int count);
+static void output_results(const struct options *options, const char *name,
+                           minmax *table, int table_size, off_t data_size);
+static void output_report(const char *fmt, ...);
+static void print_indent(register int indent);
+static void usage(const char *prog);
+static void report_parameters(struct options *opts);
+
+/*
+ * Function:    main
+ * Purpose:     Start things up.
+ * Return:      EXIT_SUCCESS or EXIT_FAILURE
+ * Programmer:  Bill Wendling, 30. October 2001
+ * Modifications:
+ */
+int
+main(int argc, char **argv)
+{
+    int ret;
+    int exit_value = EXIT_SUCCESS;
+    struct options *opts = NULL;
+
+    output = stdout;
+
+    opts = parse_command_line(argc, argv);
+
+    if (!opts) {
+        exit_value = EXIT_FAILURE;
+        goto finish;
+    }
+
+    if (opts->output_file) {
+        if ((output = fopen(opts->output_file, "w")) == NULL) {
+            fprintf(stderr, "%s: cannot open output file\n", progname);
+            perror(opts->output_file);
+            goto finish;
+        }
+    }
+
+    report_parameters(opts);
+
+    run_test_loop(opts);
+
+finish:
+    free(opts);
+    return exit_value;
+}
+
+/*
+ * Function:    run_test_loop
+ * Purpose:     Run the I/O tests. Write the results to OUTPUT.
+ *
+ *            - The slowest changing part of the test is the number of
+ *              processors to use. For each loop iteration, we divide that
+ *              number by 2 and rerun the test.
+ *
+ *            - The second slowest is what type of IO API to perform. We have
+ *              three choices: POSIXIO, and HDF5.
+ *
+ *            - Then we change the size of the buffer. This information is
+ *              inferred from the number of datasets to create and the number
+ *              of integers to put into each dataset. The backend code figures
+ *              this out.
+ *
+ * Return:      Nothing
+ * Programmer:  Bill Wendling, 30. October 2001
+ * Modifications:
+ *    Added 2D testing (Christian Chilan, 10. August 2005)
+ */
+static void
+run_test_loop(struct options *opts)
+{
+    parameters parms;
+    int i;
+    int doing_sio;      /* if this process is doing SIO */
+    size_t      buf_bytes;     
+    /* load options into parameter structure */
+    parms.num_files = opts->num_files;
+    parms.num_dsets = opts->num_dsets;
+    parms.num_iters = opts->num_iters;
+    parms.rank = opts->dset_rank;
+    parms.h5_align = opts->h5_alignment;
+    parms.h5_thresh = opts->h5_threshold;
+    parms.h5_use_chunks = opts->h5_use_chunks;
+    parms.h5_extendable = opts->h5_extendable;
+    parms.h5_write_only = opts->h5_write_only;
+    parms.h5_use_mpi_posix = opts->h5_use_mpi_posix;
+    parms.verify = opts->verify;
+    parms.vfd = opts->vfd;
+
+    /* load multidimensional options */
+    parms.num_bytes = 1;
+    buf_bytes = 1;
+    for (i=0; i<parms.rank; i++){
+        parms.buf_size[i] = opts->buf_size[i];
+        parms.dset_size[i] = opts->dset_size[i];
+        parms.chk_size[i] = opts->chk_size[i];
+        parms.order[i] = opts->order[i];
+        parms.num_bytes *= opts->dset_size[i];
+        buf_bytes *= opts->buf_size[i];
+    }
+
+    /* print size information */
+    output_report("Transfer Buffer Size (bytes): %d\n", buf_bytes);
+    output_report("File Size(MB): %.2f\n",((double)parms.num_bytes) / ONE_MB);
+
+    print_indent(0);
+    if (opts->io_types & SIO_POSIX)
+        run_test(POSIXIO, parms, opts);
+
+    print_indent(0);
+    if (opts->io_types & SIO_HDF5)
+        run_test(HDF5, parms, opts);
+}
+
+/*
+ * Function:    run_test
+ * Purpose:     Inner loop call to actually run the I/O test.
+ * Return:      Nothing
+ * Programmer:  Bill Wendling, 18. December 2001
+ * Modifications:
+ */
+static int
+run_test(iotype iot, parameters parms, struct options *opts)
+{
+    results         res;
+    register int    i, ret_value = SUCCESS;
+    int             comm_size;
+    off_t           raw_size;
+    minmax         *write_sys_mm_table=NULL;
+    minmax         *write_mm_table=NULL;
+    minmax         *write_gross_mm_table=NULL;
+    minmax         *write_raw_mm_table=NULL;
+    minmax         *read_sys_mm_table=NULL;
+    minmax         *read_mm_table=NULL;
+    minmax         *read_gross_mm_table=NULL;
+    minmax         *read_raw_mm_table=NULL;
+    minmax          write_sys_mm = {0.0, 0.0, 0.0, 0};
+    minmax          write_mm = {0.0, 0.0, 0.0, 0};
+    minmax          write_gross_mm = {0.0, 0.0, 0.0, 0};
+    minmax          write_raw_mm = {0.0, 0.0, 0.0, 0};
+    minmax          read_sys_mm = {0.0, 0.0, 0.0, 0};
+    minmax          read_mm = {0.0, 0.0, 0.0, 0};
+    minmax          read_gross_mm = {0.0, 0.0, 0.0, 0};
+    minmax          read_raw_mm = {0.0, 0.0, 0.0, 0};
+
+    raw_size = (off_t)parms.num_bytes;
+    parms.io_type = iot;
+    print_indent(2);
+    output_report("IO API = ");
+
+    switch (iot) {
+        case POSIXIO:
+            output_report("POSIX\n");
+            break;
+        case HDF5:
+            output_report("HDF5\n");
+            break;
+    }
+
+    /* allocate space for tables minmax and that it is sufficient */
+    /* to initialize all elements to zeros by calloc.             */
+    write_sys_mm_table = calloc((size_t)parms.num_iters , sizeof(minmax));
+    write_mm_table = calloc((size_t)parms.num_iters , sizeof(minmax));
+    write_gross_mm_table = calloc((size_t)parms.num_iters , sizeof(minmax));
+    write_raw_mm_table = calloc((size_t)parms.num_iters , sizeof(minmax));
+
+    if (!parms.h5_write_only) {
+        read_sys_mm_table = calloc((size_t)parms.num_iters , sizeof(minmax));
+        read_mm_table = calloc((size_t)parms.num_iters , sizeof(minmax));
+        read_gross_mm_table = calloc((size_t)parms.num_iters , sizeof(minmax));
+        read_raw_mm_table = calloc((size_t)parms.num_iters , sizeof(minmax));
+    }
+
+    /* Do IO iteration times, collecting statistics each time */
+    for (i = 0; i < parms.num_iters; ++i) {
+        double t;
+        res = do_sio(parms);
+
+        /* gather all of the "sys write" times */
+        t = get_time(res.timers, HDF5_MPI_WRITE);
+        get_minmax(&write_sys_mm, t);
+
+        write_sys_mm_table[i] = write_sys_mm;
+
+        /* gather all of the "write" times */
+        t = get_time(res.timers, HDF5_FINE_WRITE_FIXED_DIMS);
+        get_minmax(&write_mm, t);
+
+        write_mm_table[i] = write_mm;
+
+        /* gather all of the "write" times from open to close */
+        t = get_time(res.timers, HDF5_GROSS_WRITE_FIXED_DIMS);
+        get_minmax(&write_gross_mm, t);
+
+        write_gross_mm_table[i] = write_gross_mm;
+
+        /* gather all of the raw "write" times */
+        t = get_time(res.timers, HDF5_RAW_WRITE_FIXED_DIMS);
+        get_minmax(&write_raw_mm, t);
+
+        write_raw_mm_table[i] = write_raw_mm;
+
+        if (!parms.h5_write_only) {
+            /* gather all of the "mpi read" times */
+            t = get_time(res.timers, HDF5_MPI_READ);
+            get_minmax(&read_sys_mm, t);
+
+            read_sys_mm_table[i] = read_sys_mm;
+
+            /* gather all of the "read" times */
+            t = get_time(res.timers, HDF5_FINE_READ_FIXED_DIMS);
+            get_minmax(&read_mm, t);
+
+            read_mm_table[i] = read_mm;
+
+            /* gather all of the "read" times from open to close */
+            t = get_time(res.timers, HDF5_GROSS_READ_FIXED_DIMS);
+            get_minmax(&read_gross_mm, t);
+
+            read_gross_mm_table[i] = read_gross_mm;
+
+            /* gather all of the raw "read" times */
+            t = get_time(res.timers, HDF5_RAW_READ_FIXED_DIMS);
+            get_minmax(&read_raw_mm, t);
+
+            read_raw_mm_table[i] = read_gross_mm;
+        }
+        sio_time_destroy(res.timers);
+    }
+
+    /*
+     * Show various statistics
+     */
+    /* Write statistics	*/
+    /* Print the raw data throughput if desired */
+    if (opts->print_raw) {
+        /* accumulate and output the max, min, and average "raw write" times */
+        if (sio_debug_level >= 3) {
+            /* output all of the times for all iterations */
+            print_indent(3);
+            output_report("Raw Data Write details:\n");
+            output_all_info(write_raw_mm_table, parms.num_iters, 4);
+        }
+
+        output_results(opts,"Raw Data Write",write_raw_mm_table,parms.num_iters,raw_size);
+    } /* end if */
+
+    /* show sys write statics */
+#if 0
+    if (sio_debug_level >= 3) {
+        /* output all of the times for all iterations */
+        print_indent(3);
+        output_report("MPI Write details:\n");
+        output_all_info(write_sys_mm_table, parms.num_iters, 4);
+    }
+#endif
+    /* We don't currently output the MPI write results */
+
+    /* accumulate and output the max, min, and average "write" times */
+    if (sio_debug_level >= 3) {
+        /* output all of the times for all iterations */
+        print_indent(3);
+        output_report("Write details:\n");
+        output_all_info(write_mm_table, parms.num_iters, 4);
+    }
+
+    output_results(opts,"Write",write_mm_table,parms.num_iters,raw_size);
+
+    /* accumulate and output the max, min, and average "gross write" times */
+    if (sio_debug_level >= 3) {
+        /* output all of the times for all iterations */
+        print_indent(3);
+        output_report("Write Open-Close details:\n");
+        output_all_info(write_gross_mm_table, parms.num_iters, 4);
+    }
+
+    output_results(opts,"Write Open-Close",write_gross_mm_table,parms.num_iters,raw_size);
+
+    if (!parms.h5_write_only) {
+        /* Read statistics	*/
+        /* Print the raw data throughput if desired */
+        if (opts->print_raw) {
+            /* accumulate and output the max, min, and average "raw read" times */
+            if (sio_debug_level >= 3) {
+                /* output all of the times for all iterations */
+                print_indent(3);
+                output_report("Raw Data Read details:\n");
+                output_all_info(read_raw_mm_table, parms.num_iters, 4);
+            }
+
+            output_results(opts, "Raw Data Read", read_raw_mm_table,
+                           parms.num_iters, raw_size);
+        } /* end if */
+
+        /* show mpi read statics */
+#if 0
+        if (sio_debug_level >= 3) {
+            /* output all of the times for all iterations */
+            print_indent(3);
+            output_report("MPI Read details:\n");
+            output_all_info(read_sys_mm_table, parms.num_iters, 4);
+        }
+#endif
+        /* We don't currently output the MPI read results */
+
+        /* accumulate and output the max, min, and average "read" times */
+        if (sio_debug_level >= 3) {
+            /* output all of the times for all iterations */
+            print_indent(3);
+            output_report("Read details:\n");
+            output_all_info(read_mm_table, parms.num_iters, 4);
+        }
+
+        output_results(opts, "Read", read_mm_table, parms.num_iters, raw_size);
+
+        /* accumulate and output the max, min, and average "gross read" times */
+        if (sio_debug_level >= 3) {
+            /* output all of the times for all iterations */
+            print_indent(3);
+            output_report("Read Open-Close details:\n");
+            output_all_info(read_gross_mm_table, parms.num_iters, 4);
+        }
+
+        output_results(opts, "Read Open-Close", read_gross_mm_table,
+                       parms.num_iters, raw_size);
+    }
+
+    /* clean up our mess */
+    free(write_sys_mm_table);
+    free(write_mm_table);
+    free(write_gross_mm_table);
+    free(write_raw_mm_table);
+
+    if (!parms.h5_write_only) {
+        free(read_sys_mm_table);
+        free(read_mm_table);
+        free(read_gross_mm_table);
+        free(read_raw_mm_table);
+    }
+
+    return ret_value;
+}
+
+/*
+ * Function:    output_all_info
+ * Purpose:
+ * Return:      Nothing
+ * Programmer:  Bill Wendling, 29. January 2002
+ * Modifications:
+ */
+static void
+output_all_info(minmax *mm, int count, int indent_level)
+{
+    int i;
+
+    for (i = 0; i < count; ++i) {
+        print_indent(indent_level);
+        output_report("Iteration %d:\n", i + 1);
+        print_indent(indent_level + 1);
+        output_report("Minimum Time: %.2fs\n", mm[i].min);
+        print_indent(indent_level + 1);
+        output_report("Maximum Time: %.2fs\n", mm[i].max);
+    }
+}
+
+/*
+ * Function:    get_minmax
+ * Purpose:     Gather all the min, max and total of val.
+ * Return:      Nothing
+ * Programmer:  Bill Wendling, 21. December 2001
+ * Modifications:
+ *    Use MPI_Allreduce to do it. -akc, 2002/01/11
+ */
+
+static void
+get_minmax(minmax *mm, double val)
+{
+    mm->max = val;
+    mm->min = val;
+    mm->sum = val;
+}
+
+/*
+ * Function:    accumulate_minmax_stuff
+ * Purpose:     Accumulate the minimum, maximum, and average of the times
+ *              across all processes.
+ * Return:      TOTAL_MM - the total of all of these.
+ * Programmer:  Bill Wendling, 21. December 2001
+ * Modifications:
+ *              Changed to use seconds instead of MB/s - QAK, 5/9/02
+ */
+static minmax
+accumulate_minmax_stuff(minmax *mm, int count)
+{
+    int i;
+    minmax total_mm;
+
+    total_mm.sum = 0.0;
+    total_mm.max = -DBL_MAX;
+    total_mm.min = DBL_MAX;
+    total_mm.num = count;
+
+    for (i = 0; i < count; ++i) {
+        double m = mm[i].max;
+
+        total_mm.sum += m;
+
+        if (m < total_mm.min)
+            total_mm.min = m;
+
+        if (m > total_mm.max)
+            total_mm.max = m;
+    }
+
+    return total_mm;
+}
+
+
+/*
+ * Function:    output_results
+ * Purpose:     Print information about the time & bandwidth for a given
+ *                  minmax & # of iterations.
+ * Return:      Nothing
+ * Programmer:  Quincey Koziol, 9. May 2002
+ * Modifications:
+ */
+static void
+output_results(const struct options *opts, const char *name, minmax *table,
+    int table_size,off_t data_size)
+{
+    minmax          total_mm;
+
+    total_mm = accumulate_minmax_stuff(table, table_size);
+
+    print_indent(3);
+    output_report("%s (%d iteration(s)):\n", name,table_size);
+
+    /* Note: The maximum throughput uses the minimum amount of time & vice versa */
+
+    print_indent(4);
+    output_report("Maximum Throughput: %6.2f MB/s", MB_PER_SEC(data_size,total_mm.min));
+    if(opts->print_times)
+        output_report(" (%7.3f s)\n", total_mm.min);
+    else
+        output_report("\n");
+
+    print_indent(4);
+    output_report("Average Throughput: %6.2f MB/s",
+                  MB_PER_SEC(data_size,total_mm.sum / total_mm.num));
+    if(opts->print_times)
+        output_report(" (%7.3f s)\n", (total_mm.sum / total_mm.num));
+    else
+        output_report("\n");
+
+    print_indent(4);
+    output_report("Minimum Throughput: %6.2f MB/s", MB_PER_SEC(data_size,total_mm.max));
+    if(opts->print_times)
+        output_report(" (%7.3f s)\n", total_mm.max);
+    else
+        output_report("\n");
+}
+
+/*
+ * Function:    output_report
+ * Purpose:     Print a line of the report. Only do so if I'm the 0 process.
+ * Return:      Nothing
+ * Programmer:  Bill Wendling, 19. December 2001
+ * Modifications:
+ */
+static void
+output_report(const char *fmt, ...)
+{
+        va_list ap;
+
+        va_start(ap, fmt);
+        vfprintf(output, fmt, ap);
+        va_end(ap);
+}
+
+/*
+ * Function:    print_indent
+ * Purpose:     Print spaces to indent a new line of text for pretty printing
+ *              things.
+ * Return:      Nothing
+ * Programmer:  Bill Wendling, 29. October 2001
+ * Modifications:
+ */
+static void
+print_indent(register int indent)
+{
+	indent *= TAB_SPACE;
+
+	for (; indent > 0; --indent)
+	    fputc(' ', output);
+}
+
+static void
+recover_size_and_print(long_long val, const char *end)
+{
+    if (val >= ONE_KB && (val % ONE_KB) == 0) {
+        if (val >= ONE_MB && (val % ONE_MB) == 0) {
+            if (val >= ONE_GB && (val % ONE_GB) == 0)
+                HDfprintf(output, "%HdGB%s", val / ONE_GB, end);
+            else
+                HDfprintf(output, "%HdMB%s", val / ONE_MB, end);
+        } else {
+            HDfprintf(output, "%HdKB%s", val / ONE_KB, end);
+        }
+    } else {
+        HDfprintf(output, "%Hd%s", val, end);
+    }
+}
+
+static void
+print_io_api(long io_types)
+{
+    if (io_types & SIO_POSIX)
+	HDfprintf(output, "posix ");
+    if (io_types & SIO_HDF5)
+	HDfprintf(output, "hdf5 ");
+    HDfprintf(output, "\n");
+}
+
+static void
+report_parameters(struct options *opts)
+{
+    int i, rank;
+    rank = opts->dset_rank;
+
+    print_version("HDF5 Library");	/* print library version */
+    HDfprintf(output, "==== Parameters ====\n");
+
+    HDfprintf(output, "IO API=");
+    print_io_api(opts->io_types);
+
+    HDfprintf(output, "Number of iterations=%Hd\n",
+              (long_long)opts->num_iters);
+
+    HDfprintf(output, "Dataset size=");
+
+    for (i=0; i<rank; i++)
+        recover_size_and_print((long_long)opts->dset_size[i], " ");
+    HDfprintf(output, "\n");
+
+
+    HDfprintf(output, "Transfer buffer size=");
+    for (i=0; i<rank; i++)
+        recover_size_and_print((long_long)opts->buf_size[i], " ");
+    HDfprintf(output, "\n");
+
+    HDfprintf(output, "Dimension access order=");
+    for (i=0; i<rank; i++)
+        recover_size_and_print((long_long)opts->order[i], " ");
+    HDfprintf(output, "\n");
+
+    if (opts->io_types & SIO_HDF5) {
+
+        HDfprintf(output, "HDF5 data storage method=");
+
+        if (opts->h5_use_chunks){
+
+            HDfprintf(output, "Chunked\n");
+            HDfprintf(output, "HDF5 chunk size=");
+            for (i=0; i<rank; i++)
+                recover_size_and_print((long_long)opts->chk_size[i], " ");
+            HDfprintf(output, "\n");
+
+            HDfprintf(output, "HDF5 dataset dimensions=");
+            if (opts->h5_extendable) {
+                HDfprintf(output, "Extendable\n");
+            }
+            else {
+                HDfprintf(output, "Fixed\n");
+            }
+        }
+        else {
+            HDfprintf(output, "Contiguous\n");
+        }
+        
+        HDfprintf(output, "HDF5 file driver=");
+        if (opts->vfd==sec2) {
+            HDfprintf(output, "sec2\n");
+        } else if (opts->vfd==stdio) {
+            HDfprintf(output, "stdio\n");
+        } else if (opts->vfd==core) {
+            HDfprintf(output, "core\n");
+        } else if (opts->vfd==split) {
+            HDfprintf(output, "split\n");
+        } else if (opts->vfd==multi) {
+            HDfprintf(output, "multi\n");
+        } else if (opts->vfd==family) {
+            HDfprintf(output, "family\n");
+        } else if (opts->vfd==direct) {
+            HDfprintf(output, "direct\n");
+        }
+    }
+    HDfprintf(output, "==== End of Parameters ====\n");
+    HDfprintf(output, "\n");
+}
+
+/*
+ * Function:    parse_command_line
+ * Purpose:     Parse the command line options and return a STRUCT OPTIONS
+ *              structure which will need to be freed by the calling function.
+ * Return:      Pointer to an OPTIONS structure
+ * Programmer:  Bill Wendling, 31. October 2001
+ * Modifications:
+ *    Added 2D testing (Christian Chilan, 10. August 2005)
+ */
+static struct options *
+parse_command_line(int argc, char *argv[])
+{
+    register int opt;
+    struct options *cl_opts;
+    int i, default_rank, actual_rank, ranks[4];
+    cl_opts = (struct options *)malloc(sizeof(struct options));
+
+    cl_opts->output_file = NULL;
+    cl_opts->io_types =  0;    /* will set default after parsing options */
+    cl_opts->num_iters = 1;
+ 
+    default_rank = 2;
+
+    cl_opts->dset_rank = 0;
+    cl_opts->buf_rank = 0;
+    cl_opts->chk_rank = 0;
+    cl_opts->order_rank = 0;
+
+    for (i=0; i<MAX_DIMS; i++){
+        cl_opts->buf_size[i]=(i+1)*10;
+        cl_opts->dset_size[i]=(i+1)*100;
+        cl_opts->chk_size[i]=(i+1)*10;
+        cl_opts->order[i]=i+1;
+    }
+
+    cl_opts->vfd = sec2;
+   
+    cl_opts->print_times = FALSE;   /* Printing times is off by default */
+    cl_opts->print_raw = FALSE;     /* Printing raw data throughput is off by default */
+    cl_opts->h5_alignment = 1;      /* No alignment for HDF5 objects by default */
+    cl_opts->h5_threshold = 1;      /* No threshold for aligning HDF5 objects by default */
+    cl_opts->h5_use_chunks = FALSE; /* Don't chunk the HDF5 dataset by default */
+    cl_opts->h5_write_only = FALSE; /* Do both read and write by default */
+    cl_opts->h5_extendable = FALSE; /* Use extendable dataset */
+    cl_opts->h5_use_mpi_posix = FALSE; /* Don't use MPI-posix VFD for HDF5 I/O by default */
+    cl_opts->verify = FALSE;        /* No Verify data correctness by default */
+
+    while ((opt = get_option(argc, (const char **)argv, s_opts, l_opts)) != EOF) {
+        switch ((char)opt) {
+        case 'a':
+            cl_opts->h5_alignment = parse_size_directive(opt_arg);
+            break;
+        case 'A':
+            {
+                const char *end = opt_arg;
+                while (end && *end != '\0') {
+                    char buf[10];
+                    int i;
+
+                    memset(buf, '\0', sizeof(buf));
+
+                    for (i = 0; *end != '\0' && *end != ','; ++end)
+                        if (isalnum(*end) && i < 10)
+                            buf[i++] = *end;
+
+                    if (!strcasecmp(buf, "hdf5")) {
+                        cl_opts->io_types |= SIO_HDF5;
+                    } else if (!strcasecmp(buf, "posix")) {
+                        cl_opts->io_types |= SIO_POSIX;
+                    } else {
+                        fprintf(stderr, "sio_perf: invalid --api option %s\n",
+                                buf);
+                        exit(EXIT_FAILURE);
+                    }
+
+                    if (*end == '\0')
+                        break;
+
+                    end++;
+                }
+            }
+
+            break;
+#if 0
+        case 'b':
+            /* the future "binary" option */
+            break;
+#endif  /* 0 */
+        case 'c':
+            /* Turn on chunked HDF5 dataset creation */
+            cl_opts->h5_use_chunks = 1;
+            {
+                const char *end = opt_arg;
+                int j = 0;
+
+                while (end && *end != '\0') {
+                    char buf[10];
+                    int i;
+
+                    memset(buf, '\0', sizeof(buf));
+
+                    for (i = 0; *end != '\0' && *end != ','; ++end)
+                        if (isalnum(*end) && i < 10)
+                            buf[i++] = *end;
+
+                    cl_opts->chk_size[j] = parse_size_directive(buf);
+
+                    j++;
+
+                    if (*end == '\0')
+                        break;
+
+                    end++;
+                }
+                cl_opts->chk_rank = j;
+            }
+
+            break;
+
+
+        case 'D':
+            {
+                const char *end = opt_arg;
+
+                while (end && *end != '\0') {
+                    char buf[10];
+                    int i;
+
+                    memset(buf, '\0', sizeof(buf));
+
+                    for (i = 0; *end != '\0' && *end != ','; ++end)
+                        if (isalnum(*end) && i < 10)
+                            buf[i++] = *end;
+
+                    if (strlen(buf) > 1 || isdigit(buf[0])) {
+                        size_t j;
+
+                        for (j = 0; j < 10 && buf[j] != '\0'; ++j)
+                            if (!isdigit(buf[j])) {
+                                fprintf(stderr, "sio_perf: invalid --debug option %s\n",
+                                        buf);
+                                exit(EXIT_FAILURE);
+                            }
+
+                        sio_debug_level = atoi(buf);
+
+                        if (sio_debug_level > 4)
+                            sio_debug_level = 4;
+                        else if (sio_debug_level < 0)
+                            sio_debug_level = 0;
+                    } else {
+                        switch (*buf) {
+                        case 'r':
+                            /* Turn on raw data throughput info */
+                            cl_opts->print_raw = TRUE;
+                            break;
+                        case 't':
+                            /* Turn on time printing */
+                            cl_opts->print_times = TRUE;
+                            break;
+            case 'v':
+                            /* Turn on verify data correctness*/
+                cl_opts->verify = TRUE;
+                break;
+                        default:
+                            fprintf(stderr, "sio_perf: invalid --debug option %s\n", buf);
+                            exit(EXIT_FAILURE);
+                        }
+                    }
+
+                    if (*end == '\0')
+                        break;
+
+                    end++;
+                }
+            }
+
+            break;
+        case 'e':
+            {
+                const char *end = opt_arg;
+                int j = 0;
+
+                while (end && *end != '\0') {
+                    char buf[10];
+                    int i;
+
+                    memset(buf, '\0', sizeof(buf));
+
+                    for (i = 0; *end != '\0' && *end != ','; ++end)
+                        if (isalnum(*end) && i < 10)
+                            buf[i++] = *end;
+
+                    cl_opts->dset_size[j] = parse_size_directive(buf);
+
+                    j++;
+
+                    if (*end == '\0')
+                        break;
+
+                    end++;
+                }
+                cl_opts->dset_rank = j;
+            }
+
+            break;
+
+        case 'i':
+            cl_opts->num_iters = atoi(opt_arg);
+            break;
+        case 'm':
+            /* Turn on MPI-posix VFL driver for HDF5 I/O */
+            cl_opts->h5_use_mpi_posix = TRUE;
+            break;
+        case 'o':
+            cl_opts->output_file = opt_arg;
+            break;
+        case 'T':
+            cl_opts->h5_threshold = parse_size_directive(opt_arg);
+            break;
+        case 'v':
+            if (!strcasecmp(opt_arg, "sec2")) {
+                cl_opts->vfd=sec2;
+            } else if (!strcasecmp(opt_arg, "stdio")) {
+                cl_opts->vfd=stdio;
+            } else if (!strcasecmp(opt_arg, "core")) {
+                cl_opts->vfd=core;
+            } else if (!strcasecmp(opt_arg, "split")) {
+                cl_opts->vfd=split;
+            } else if (!strcasecmp(opt_arg, "multi")) {
+                cl_opts->vfd=multi;
+            } else if (!strcasecmp(opt_arg, "family")) {
+                cl_opts->vfd=family;
+            } else if (!strcasecmp(opt_arg, "direct")) {
+                cl_opts->vfd=direct;
+            } else {
+                fprintf(stderr, "sio_perf: invalid --api option %s\n",
+                                opt_arg);
+                exit(EXIT_FAILURE);
+            }
+            break;
+        case 'w':
+            cl_opts->h5_write_only = TRUE;
+            break;
+        case 't':
+            cl_opts->h5_extendable = TRUE;
+            break;
+        case 'x':
+            {
+                const char *end = opt_arg;
+                int j = 0;
+
+                while (end && *end != '\0') {
+                    char buf[10];
+                    int i;
+
+                    memset(buf, '\0', sizeof(buf));
+
+                    for (i = 0; *end != '\0' && *end != ','; ++end)
+                        if (isalnum(*end) && i < 10)
+                            buf[i++] = *end;
+
+                    cl_opts->buf_size[j] = parse_size_directive(buf);
+
+                    j++;
+
+                    if (*end == '\0')
+                        break;
+
+                    end++;
+                }
+                cl_opts->buf_rank = j;
+            }
+
+            break;
+
+        case 'r':
+            {
+                const char *end = opt_arg;
+                int j = 0;
+
+                while (end && *end != '\0') {
+                    char buf[10];
+                    int i;
+
+                    memset(buf, '\0', sizeof(buf));
+
+                    for (i = 0; *end != '\0' && *end != ','; ++end)
+                        if (isalnum(*end) && i < 10)
+                            buf[i++] = *end;
+
+                    cl_opts->order[j] = parse_size_directive(buf);
+
+                    j++;
+
+                    if (*end == '\0')
+                        break;
+
+                    end++;
+                }
+
+                cl_opts->order_rank = j;
+            }
+
+            break;
+
+        case 'h':
+        case '?':
+        default:
+            usage(progname);
+            free(cl_opts);
+            return NULL;
+        }
+    }
+
+    /* perform rank consistency analysis */
+    actual_rank = 0;
+
+    ranks[0] = cl_opts->dset_rank;
+    ranks[1] = cl_opts->buf_rank;
+    ranks[2] = cl_opts->order_rank;
+    ranks[3] = cl_opts->chk_rank;
+
+    for (i=0; i<4; i++) {
+        if (ranks[i]>0) {
+            if (!actual_rank) {
+                actual_rank = ranks[i];
+            }
+            else {
+                if (actual_rank != ranks[i])
+                    exit(EXIT_FAILURE);
+            }
+        }
+    }
+
+    if (!actual_rank)
+        actual_rank = default_rank;
+
+    cl_opts->dset_rank = actual_rank;
+    cl_opts->buf_rank = actual_rank;
+    cl_opts->order_rank = actual_rank;
+    cl_opts->chk_rank = actual_rank;
+
+
+    /* set default if none specified yet */
+    if (!cl_opts->io_types)
+        cl_opts->io_types = SIO_HDF5 | SIO_POSIX; /* run all API */
+
+    /* verify parameters sanity.  Adjust if needed. */
+    /* cap xfer_size with bytes per process */
+    if (cl_opts->num_iters <= 0)
+        cl_opts->num_iters = 1;
+
+    return cl_opts;
+}
+
+/*
+ * Function:    parse_size_directive
+ * Purpose:     Parse the size directive passed on the commandline. The size
+ *              directive is an integer followed by a size indicator:
+ *
+ *                  K, k - Kilobyte
+ *                  M, m - Megabyte
+ *                  G, g - Gigabyte
+ *
+ * Return:      The size as a off_t because this is related to file size.
+ *              If an unknown size indicator is used, then the program will
+ *              exit with EXIT_FAILURE as the return value.
+ * Programmer:  Bill Wendling, 18. December 2001
+ * Modifications:
+ */
+
+static off_t
+parse_size_directive(const char *size)
+{
+    off_t s;
+    char *endptr;
+
+    s = strtol(size, &endptr, 10);
+
+    if (endptr && *endptr) {
+        while (*endptr != '\0' && (*endptr == ' ' || *endptr == '\t'))
+            ++endptr;
+
+        switch (*endptr) {
+            case 'K':
+            case 'k':
+                s *= ONE_KB;
+                break;
+            case 'M':
+            case 'm':
+                s *= ONE_MB;
+                break;
+            case 'G':
+            case 'g':
+                s *= ONE_GB;
+                break;
+            default:
+                fprintf(stderr, "Illegal size specifier '%c'\n", *endptr);
+                exit(EXIT_FAILURE);
+        }
+    }
+
+    return s;
+}
+
+/*
+ * Function:    usage
+ * Purpose:     Print a usage message and then exit.
+ * Return:      Nothing
+ * Programmer:  Bill Wendling, 31. October 2001
+ * Modifications:
+ * 	Added 2D testing (Christian Chilan, 10. August 2005)
+ */
+static void
+usage(const char *prog)
+{
+
+
+	print_version(prog);
+        printf("usage: %s [OPTIONS]\n", prog);
+        printf("  OPTIONS\n");
+        printf("     -h, --help                  Print a usage message and exit\n");
+        printf("     -a S, --align=S             Alignment of objects in HDF5 file [default: 1]\n");
+        printf("     -A AL, --api=AL             Which APIs to test [default: all of them]\n");
+#if 0
+        printf("     -b, --binary                The elusive binary option\n");
+#endif  /* 0 */
+        printf("     -B S, --block-size=S        Block size within transfer buffer\n");
+        printf("                                 (see below for description)\n");
+        printf("                                 [default: half the number of bytes per processor per dataset]\n");
+        printf("     -c, --chunk                 Create HDF5 datasets chunked [default: off]\n");
+        printf("     -C, --collective            Use collective I/O for MPI and HDF5 APIs\n");
+        printf("                                 [default: off (i.e. independent I/O)]\n");
+        printf("     -d N, --num-dsets=N         Number of datasets per file [default:1]\n");
+        printf("     -D DL, --debug=DL           Indicate the debugging level\n");
+        printf("                                 [default: no debugging]\n");
+        printf("     -e S, --num-bytes=S         Number of bytes per process per dataset\n");
+        printf("                                 [default: 256K for 1D, 8K for 2D]\n");
+        printf("     -F N, --num-files=N         Number of files [default: 1]\n");
+        printf("     -g, --geometry              Use 2D geometry [default: 1D]\n");
+        printf("     -i N, --num-iterations=N    Number of iterations to perform [default: 1]\n");
+        printf("     -I, --interleaved           Interleaved block I/O (see below for example)\n");
+        printf("                                 [default: Contiguous block I/O]\n");
+        printf("     -m, --mpi-posix             Use MPI-posix driver for HDF5 I/O\n");
+        printf("                                 [default: use MPI-I/O driver]\n");
+        printf("     -o F, --output=F            Output raw data into file F [default: none]\n");
+        printf("     -p N, --min-num-processes=N Minimum number of processes to use [default: 1]\n");
+        printf("     -P N, --max-num-processes=N Maximum number of processes to use\n");
+        printf("                                 [default: all MPI_COMM_WORLD processes ]\n");
+        printf("     -T S, --threshold=S         Threshold for alignment of objects in HDF5 file\n");
+        printf("                                 [default: 1]\n");
+        printf("     -w, --write-only            Perform write tests not the read tests\n");
+        printf("     -x S, --min-xfer-size=S     Minimum transfer buffer size\n");
+        printf("                                 [default: half the number of bytes per processor per dataset]\n");
+        printf("     -X S, --max-xfer-size=S     Maximum transfer buffer size\n");
+        printf("                                 [default: the number of bytes per processor per dataset]\n");
+        printf("\n");
+        printf("  F  - is a filename.\n");
+        printf("  N  - is an integer >=0.\n");
+        printf("  S  - is a size specifier, an integer >=0 followed by a size indicator:\n");
+        printf("          K - Kilobyte (%d)\n", ONE_KB);
+        printf("          M - Megabyte (%d)\n", ONE_MB);
+        printf("          G - Gigabyte (%d)\n", ONE_GB);
+        printf("\n");
+        printf("      Example: '37M' is 37 megabytes or %d bytes\n", 37*ONE_MB);
+        printf("\n");
+        printf("  AL - is an API list. Valid values are:\n");
+        printf("          phdf5 - Parallel HDF5\n");
+        printf("          mpiio - MPI-I/O\n");
+        printf("          posix - POSIX\n");
+        printf("\n");
+        printf("      Example: --api=mpiio,phdf5\n");
+        printf("\n");
+        printf("  Block size vs. Transfer buffer size:\n");
+        printf("      The transfer buffer size is the size of a buffer in memory, which is\n");
+        printf("      broken into 'block size' pieces and written to the file.  The pattern\n");
+        printf("      of the blocks in the file is described below in the 'Interleaved vs.\n");
+        printf("      Contiguous blocks' example.\n");
+        printf("\n");
+        printf("      If the collective I/O option is given, the blocks in each transfer buffer\n");
+        printf("      are written at once with an MPI derived type, for the MPI-I/O and PHDF5\n");
+        printf("      APIs.\n");
+        printf("\n");
+        printf("  Interleaved vs. Contiguous blocks:\n");
+        printf("      When contiguous blocks are written to a dataset, the dataset is divided\n");
+        printf("      into '# processes' regions and each process writes data to its own region.\n");
+        printf("      When interleaved blocks are written to a dataset, space for the first\n");
+        printf("      block of the first process is allocated in the dataset, then space is\n");
+        printf("      allocated for the first block of the second process, etc. until space is\n");
+        printf("      allocated for the first block of each process, then space is allocated for\n");
+        printf("      the second block of the first process, the second block of the second\n");
+        printf("      process, etc.\n");
+        printf("\n");
+        printf("      For example, with a 4 process run, 1MB bytes-per-process, 256KB transfer\n");
+        printf("        buffer size, and 64KB block size,\n");
+        printf("          16 contiguous blocks per process are written to the file like so:\n");
+        printf("              1111111111111111222222222222222233333333333333334444444444444444\n");
+        printf("          16 interleaved blocks per process are written to the file like so:\n");
+        printf("              1234123412341234123412341234123412341234123412341234123412341234\n");
+        printf("        If collective I/O is turned on, all of the four blocks per transfer\n");
+        printf("        buffer will be written in one collective I/O call.\n");
+        printf("\n");
+        printf("  DL - is a list of debugging flags. Valid values are:\n");
+        printf("          1 - Minimal\n");
+        printf("          2 - Not quite everything\n");
+        printf("          3 - Everything\n");
+        printf("          4 - The kitchen sink\n");
+        printf("          r - Raw data I/O throughput information\n");
+        printf("          t - Times as well as throughputs\n");
+        printf("          v - Verify data correctness\n");
+        printf("\n");
+        printf("      Example: --debug=2,r,t\n");
+        printf("\n");
+        printf("  Environment variables:\n");
+        printf("  HDF5_NOCLEANUP   Do not remove data files if set [default remove]\n");
+        printf("  HDF5_MPI_INFO    MPI INFO object key=value separated by ;\n");
+        printf("  HDF5_PARAPREFIX  Paralllel data files prefix\n");
+        fflush(stdout);
+}
+