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Diffstat (limited to 'tools/src/h5perf/perf.c')
| -rw-r--r-- | tools/src/h5perf/perf.c | 796 |
1 files changed, 796 insertions, 0 deletions
diff --git a/tools/src/h5perf/perf.c b/tools/src/h5perf/perf.c new file mode 100644 index 0000000..50b18bc --- /dev/null +++ b/tools/src/h5perf/perf.c @@ -0,0 +1,796 @@ +/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * + * Copyright by The HDF Group. * + * 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 COPYING file, which can be found at the root of the source code * + * distribution tree, or in https://www.hdfgroup.org/licenses. * + * If you do not have access to either file, you may request a copy from * + * help@hdfgroup.org. * + * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ + +/* + * Author: Albert Cheng of NCSA, May 1, 2001. + * This is derived from code given to me by Robert Ross. + * + * NOTE: This code assumes that all command line arguments make it out to all + * the processes that make up the parallel job, which isn't always the case. + * So if it doesn't work on some platform, that might be why. + */ + +#include "hdf5.h" +#include "H5private.h" + +#ifdef H5_HAVE_PARALLEL + +#include <errno.h> +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <time.h> + +#ifdef H5_HAVE_SYS_STAT_H +#include <sys/stat.h> +#endif + +#ifdef H5_HAVE_SYS_TIME_H +#include <sys/time.h> +#endif + +#ifdef H5_HAVE_SYS_TYPES_H +#include <sys/types.h> +#endif + +#ifdef H5_HAVE_UNISTD_H +#include <unistd.h> +#endif + +#include <mpi.h> +#ifndef MPI_FILE_NULL /*MPIO may be defined in mpi.h already */ +#include <mpio.h> +#endif + +/* Macro definitions */ +/* Verify: + * if val is false (0), print mesg and if fatal is true (non-zero), die. + */ +#define H5FATAL 1 +#define VRFY(val, mesg, fatal) \ + do { \ + if (!val) { \ + printf("Proc %d: ", mynod); \ + printf("*** Assertion failed (%s) at line %4d in %s\n", mesg, (int)__LINE__, __FILE__); \ + if (fatal) { \ + fflush(stdout); \ + goto die_jar_jar_die; \ + } \ + } \ + } while (0) +#define RANK 1 +#define MAX_PATH 1024 + +hsize_t dims[RANK]; /* dataset dim sizes */ +hsize_t block[RANK], stride[RANK], count[RANK]; +hsize_t start[RANK]; +hid_t fid; /* HDF5 file ID */ +hid_t acc_tpl; /* File access templates */ +hid_t sid; /* Dataspace ID */ +hid_t file_dataspace; /* File dataspace ID */ +hid_t mem_dataspace; /* memory dataspace ID */ +hid_t dataset; /* Dataset ID */ +hsize_t opt_alignment = 1; +hsize_t opt_threshold = 1; +int opt_split_vfd = 0; +char * meta_ext, *raw_ext; /* holds the meta and raw file extension if */ + /* opt_split_vfd is set */ + +/* DEFAULT VALUES FOR OPTIONS */ +int64_t opt_block = 1048576 * 16; +int opt_iter = 1; +int opt_stripe = -1; +int opt_correct = 0; +int amode = O_RDWR | O_CREAT; +char opt_file[256] = "perftest.out"; +char opt_pvfstab[256] = "notset"; +int opt_pvfstab_set = 0; + +const char *FILENAME[] = {opt_file, NULL}; + +/* function prototypes */ +static int parse_args(int argc, char **argv); + +#ifndef H5_HAVE_UNISTD_H +/* globals needed for getopt */ +extern char *optarg; +#endif + +#ifndef HDF5_PARAPREFIX +#define HDF5_PARAPREFIX "" +#endif +char * paraprefix = NULL; /* for command line option para-prefix */ +MPI_Info h5_io_info_g = MPI_INFO_NULL; /* MPI INFO object for IO */ + +static char *h5_fixname_real(const char *base_name, hid_t fapl, const char *_suffix, char *fullname, + size_t size, hbool_t nest_printf, hbool_t subst_for_superblock); + +int +main(int argc, char **argv) +{ + char * buf, *tmp, *buf2 = NULL, *tmp2 = NULL, *check; + int i, j, mynod = 0, nprocs = 1, my_correct = 1, correct, myerrno; + double stim, etim; + double write_tim = 0; + double read_tim = 0; + double read_bw, write_bw; + double max_read_tim, max_write_tim; + double min_read_tim, min_write_tim; + double ave_read_tim, ave_write_tim; + int64_t iter_jump = 0; + char filename[MAX_PATH]; + herr_t ret; /* Generic return value */ + + /* startup MPI and determine the rank of this process */ + MPI_Init(&argc, &argv); + MPI_Comm_size(MPI_COMM_WORLD, &nprocs); + MPI_Comm_rank(MPI_COMM_WORLD, &mynod); + + /* parse the command line arguments */ + parse_args(argc, argv); + + if (mynod == 0) + printf("# Using hdf5-io calls.\n"); + +#ifdef H5_HAVE_UNISTD_H + /* Kind of a weird hack- if the location of the pvfstab file was + * specified on the command line, then spit out this location into + * the appropriate environment variable. + */ + if (opt_pvfstab_set) { + if ((setenv("PVFSTAB_FILE", opt_pvfstab, 1)) < 0) { + perror("setenv"); + goto die_jar_jar_die; + } + } +#endif + + /* this is how much of the file data is covered on each iteration of + * the test. used to help determine the seek offset on each + * iteration */ + iter_jump = nprocs * opt_block; + + /* setup a buffer of data to write */ + if (!(tmp = (char *)malloc((size_t)opt_block + 256))) { + perror("malloc"); + goto die_jar_jar_die; + } + buf = tmp + 128 - (((long)tmp) % 128); /* align buffer */ + + if (opt_correct) { + /* do the same buffer setup for verifiable data */ + if (!(tmp2 = (char *)malloc((size_t)opt_block + 256))) { + perror("malloc2"); + goto die_jar_jar_die; + } + buf2 = tmp + 128 - (((long)tmp) % 128); + } + + /* setup file access template with parallel IO access. */ + if (opt_split_vfd) { + hid_t mpio_pl; + + mpio_pl = H5Pcreate(H5P_FILE_ACCESS); + VRFY((acc_tpl >= 0), "", H5FATAL); + ret = H5Pset_fapl_mpio(mpio_pl, MPI_COMM_WORLD, MPI_INFO_NULL); + VRFY((ret >= 0), "", H5FATAL); + + /* set optional allocation alignment */ + if (opt_alignment * opt_threshold != 1) { + ret = H5Pset_alignment(acc_tpl, opt_threshold, opt_alignment); + VRFY((ret >= 0), "H5Pset_alignment succeeded", !H5FATAL); + } + + /* setup file access template */ + acc_tpl = H5Pcreate(H5P_FILE_ACCESS); + VRFY((acc_tpl >= 0), "", H5FATAL); + ret = H5Pset_fapl_split(acc_tpl, meta_ext, mpio_pl, raw_ext, mpio_pl); + VRFY((ret >= 0), "H5Pset_fapl_split succeeded", H5FATAL); + ret = H5Pclose(mpio_pl); + VRFY((ret >= 0), "H5Pclose mpio_pl succeeded", H5FATAL); + } + else { + /* setup file access template */ + acc_tpl = H5Pcreate(H5P_FILE_ACCESS); + VRFY((acc_tpl >= 0), "", H5FATAL); + ret = H5Pset_fapl_mpio(acc_tpl, MPI_COMM_WORLD, MPI_INFO_NULL); + VRFY((ret >= 0), "", H5FATAL); + + /* set optional allocation alignment */ + if (opt_alignment * opt_threshold != 1) { + ret = H5Pset_alignment(acc_tpl, opt_threshold, opt_alignment); + VRFY((ret >= 0), "H5Pset_alignment succeeded", !H5FATAL); + } + } + + h5_fixname_real(FILENAME[0], acc_tpl, NULL, filename, sizeof filename, FALSE, FALSE); + + /* create the parallel file */ + fid = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, acc_tpl); + VRFY((fid >= 0), "H5Fcreate succeeded", H5FATAL); + + /* define a contiquous dataset of opt_iter*nprocs*opt_block chars */ + dims[0] = (hsize_t)opt_iter * (hsize_t)nprocs * (hsize_t)opt_block; + sid = H5Screate_simple(RANK, dims, NULL); + VRFY((sid >= 0), "H5Screate_simple succeeded", H5FATAL); + dataset = H5Dcreate2(fid, "Dataset1", H5T_NATIVE_CHAR, sid, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT); + VRFY((dataset >= 0), "H5Dcreate2 succeeded", H5FATAL); + + /* create the memory dataspace and the file dataspace */ + dims[0] = (hsize_t)opt_block; + mem_dataspace = H5Screate_simple(RANK, dims, NULL); + VRFY((mem_dataspace >= 0), "", H5FATAL); + file_dataspace = H5Dget_space(dataset); + VRFY((file_dataspace >= 0), "H5Dget_space succeeded", H5FATAL); + + /* now each process writes a block of opt_block chars in round robbin + * fashion until the whole dataset is covered. + */ + for (j = 0; j < opt_iter; j++) { + /* setup a file dataspace selection */ + start[0] = (hsize_t)((j * iter_jump) + (mynod * opt_block)); + stride[0] = block[0] = (hsize_t)opt_block; + count[0] = 1; + ret = H5Sselect_hyperslab(file_dataspace, H5S_SELECT_SET, start, stride, count, block); + VRFY((ret >= 0), "H5Sset_hyperslab succeeded", H5FATAL); + + if (opt_correct) /* fill in buffer for iteration */ { + for (i = mynod + j, check = buf; i < opt_block; i++, check++) + *check = (char)i; + } + + /* discover the starting time of the operation */ + MPI_Barrier(MPI_COMM_WORLD); + stim = MPI_Wtime(); + + /* write data */ + ret = H5Dwrite(dataset, H5T_NATIVE_CHAR, mem_dataspace, file_dataspace, H5P_DEFAULT, buf); + VRFY((ret >= 0), "H5Dwrite dataset1 succeeded", !H5FATAL); + + /* discover the ending time of the operation */ + etim = MPI_Wtime(); + + write_tim += (etim - stim); + + /* we are done with this "write" iteration */ + } + + /* close dataset and file */ + ret = H5Dclose(dataset); + VRFY((ret >= 0), "H5Dclose succeeded", H5FATAL); + ret = H5Fclose(fid); + VRFY((ret >= 0), "H5Fclose succeeded", H5FATAL); + + /* wait for everyone to synchronize at this point */ + MPI_Barrier(MPI_COMM_WORLD); + + /* reopen the file for reading */ + fid = H5Fopen(filename, H5F_ACC_RDONLY, acc_tpl); + VRFY((fid >= 0), "", H5FATAL); + + /* open the dataset */ + dataset = H5Dopen2(fid, "Dataset1", H5P_DEFAULT); + VRFY((dataset >= 0), "H5Dopen succeeded", H5FATAL); + + /* we can re-use the same mem_dataspace and file_dataspace + * the H5Dwrite used since the dimension size is the same. + */ + + /* we are going to repeat the read the same pattern the write used */ + for (j = 0; j < opt_iter; j++) { + /* setup a file dataspace selection */ + start[0] = (hsize_t)((j * iter_jump) + (mynod * opt_block)); + stride[0] = block[0] = (hsize_t)opt_block; + count[0] = 1; + ret = H5Sselect_hyperslab(file_dataspace, H5S_SELECT_SET, start, stride, count, block); + VRFY((ret >= 0), "H5Sset_hyperslab succeeded", H5FATAL); + /* seek to the appropriate spot give the current iteration and + * rank within the MPI processes */ + + /* discover the start time */ + MPI_Barrier(MPI_COMM_WORLD); + stim = MPI_Wtime(); + + /* read in the file data */ + if (!opt_correct) { + ret = H5Dread(dataset, H5T_NATIVE_CHAR, mem_dataspace, file_dataspace, H5P_DEFAULT, buf); + } + else { + ret = H5Dread(dataset, H5T_NATIVE_CHAR, mem_dataspace, file_dataspace, H5P_DEFAULT, buf2); + } + myerrno = errno; + + /* discover the end time */ + etim = MPI_Wtime(); + read_tim += (etim - stim); + VRFY((ret >= 0), "H5Dwrite dataset1 succeeded", !H5FATAL); + + if (ret < 0) + HDfprintf(stderr, "node %d, read error, loc = %" PRId64 ": %s\n", mynod, mynod * opt_block, + strerror(myerrno)); + + /* if the user wanted to check correctness, compare the write + * buffer to the read buffer */ + if (opt_correct && memcmp(buf, buf2, (size_t)opt_block)) { + HDfprintf(stderr, "node %d, correctness test failed\n", mynod); + my_correct = 0; + MPI_Allreduce(&my_correct, &correct, 1, MPI_INT, MPI_MIN, MPI_COMM_WORLD); + } + + /* we are done with this read iteration */ + } + + /* close dataset and file */ + ret = H5Dclose(dataset); + VRFY((ret >= 0), "H5Dclose succeeded", H5FATAL); + ret = H5Fclose(fid); + VRFY((ret >= 0), "H5Fclose succeeded", H5FATAL); + ret = H5Pclose(acc_tpl); + VRFY((ret >= 0), "H5Pclose succeeded", H5FATAL); + + /* compute the read and write times */ + MPI_Allreduce(&read_tim, &max_read_tim, 1, MPI_DOUBLE, MPI_MAX, MPI_COMM_WORLD); + MPI_Allreduce(&read_tim, &min_read_tim, 1, MPI_DOUBLE, MPI_MIN, MPI_COMM_WORLD); + MPI_Allreduce(&read_tim, &ave_read_tim, 1, MPI_DOUBLE, MPI_SUM, MPI_COMM_WORLD); + + /* calculate the average from the sum */ + ave_read_tim = ave_read_tim / nprocs; + + MPI_Allreduce(&write_tim, &max_write_tim, 1, MPI_DOUBLE, MPI_MAX, MPI_COMM_WORLD); + MPI_Allreduce(&write_tim, &min_write_tim, 1, MPI_DOUBLE, MPI_MIN, MPI_COMM_WORLD); + MPI_Allreduce(&write_tim, &ave_write_tim, 1, MPI_DOUBLE, MPI_SUM, MPI_COMM_WORLD); + + /* calculate the average from the sum */ + ave_write_tim = ave_write_tim / nprocs; + + /* print out the results on one node */ + if (mynod == 0) { + read_bw = (double)((int64_t)(opt_block * nprocs * opt_iter)) / (max_read_tim * 1000000.0); + write_bw = (double)((int64_t)(opt_block * nprocs * opt_iter)) / (max_write_tim * 1000000.0); + + printf("nr_procs = %d, nr_iter = %d, blk_sz = %ld\n", nprocs, opt_iter, (long)opt_block); + + printf("# total_size = %ld\n", (long)(opt_block * nprocs * opt_iter)); + + printf("# Write: min_time = %f, max_time = %f, mean_time = %f\n", min_write_tim, max_write_tim, + ave_write_tim); + printf("# Read: min_time = %f, max_time = %f, mean_time = %f\n", min_read_tim, max_read_tim, + ave_read_tim); + + printf("Write bandwidth = %f Mbytes/sec\n", write_bw); + printf("Read bandwidth = %f Mbytes/sec\n", read_bw); + + if (opt_correct) { + printf("Correctness test %s.\n", correct ? "passed" : "failed"); + } + } + +die_jar_jar_die: + +#ifdef H5_HAVE_UNISTD + /* Clear the environment variable if it was set earlier */ + if (opt_pvfstab_set) { + unsetenv("PVFSTAB_FILE"); + } +#endif + + free(tmp); + if (opt_correct) + free(tmp2); + + MPI_Finalize(); + + return (0); +} + +static int +parse_args(int argc, char **argv) +{ + int c; + + while ((c = getopt(argc, argv, "s:b:i:f:p:a:2:c")) != EOF) { + switch (c) { + case 's': /* stripe */ + opt_stripe = atoi(optarg); + break; + case 'b': /* block size */ + opt_block = atoi(optarg); + break; + case 'i': /* iterations */ + opt_iter = atoi(optarg); + break; + case 'f': /* filename */ + strncpy(opt_file, optarg, 255); + FILENAME[0] = opt_file; + break; + case 'p': /* pvfstab file */ + strncpy(opt_pvfstab, optarg, 255); + opt_pvfstab_set = 1; + break; + case 'a': /* aligned allocation. + * syntax: -a<alignment>/<threshold> + * e.g., -a4096/512 allocate at 4096 bytes + * boundary if request size >= 512. + */ + { + char *p; + + opt_alignment = (hsize_t)HDatoi(optarg); + if (NULL != (p = (char *)HDstrchr(optarg, '/'))) + opt_threshold = (hsize_t)HDatoi(p + 1); + } + HDfprintf(stdout, "alignment/threshold=%" PRIuHSIZE "/%" PRIuHSIZE "\n", opt_alignment, + opt_threshold); + break; + case '2': /* use 2-files, i.e., split file driver */ + opt_split_vfd = 1; + /* get meta and raw file extension. */ + /* syntax is <raw_ext>,<meta_ext> */ + meta_ext = raw_ext = optarg; + while (*raw_ext != '\0') { + if (*raw_ext == ',') { + *raw_ext = '\0'; + raw_ext++; + break; + } + raw_ext++; + } + printf("split-file-vfd used: %s,%s\n", meta_ext, raw_ext); + break; + case 'c': /* correctness */ + opt_correct = 1; + break; + case '?': /* unknown */ + default: + break; + } + } + + return (0); +} +/*------------------------------------------------------------------------- + * Function: getenv_all + * + * Purpose: Used to get the environment that the root MPI task has. + * name specifies which environment variable to look for + * val is the string to which the value of that environment + * variable will be copied. + * + * NOTE: The pointer returned by this function is only + * valid until the next call to getenv_all and the data + * stored there must be copied somewhere else before any + * further calls to getenv_all take place. + * + * Return: pointer to a string containing the value of the environment variable + * NULL if the varialbe doesn't exist in task 'root's environment. + * + * Programmer: Leon Arber + * 4/4/05 + * + * Modifications: + * Use original getenv if MPI is not initialized. This happens + * one uses the PHDF5 library to build a serial nature code. + * Albert 2006/04/07 + * + *------------------------------------------------------------------------- + */ +char * +getenv_all(MPI_Comm comm, int root, const char *name) +{ + int mpi_size, mpi_rank, mpi_initialized, mpi_finalized; + int len; + static char *env = NULL; + + HDassert(name); + + MPI_Initialized(&mpi_initialized); + MPI_Finalized(&mpi_finalized); + + if (mpi_initialized && !mpi_finalized) { + MPI_Comm_rank(comm, &mpi_rank); + MPI_Comm_size(comm, &mpi_size); + HDassert(root < mpi_size); + + /* The root task does the getenv call + * and sends the result to the other tasks */ + if (mpi_rank == root) { + env = HDgetenv(name); + if (env) { + len = (int)HDstrlen(env); + MPI_Bcast(&len, 1, MPI_INT, root, comm); + MPI_Bcast(env, len, MPI_CHAR, root, comm); + } + else { + /* len -1 indicates that the variable was not in the environment */ + len = -1; + MPI_Bcast(&len, 1, MPI_INT, root, comm); + } + } + else { + MPI_Bcast(&len, 1, MPI_INT, root, comm); + if (len >= 0) { + if (env == NULL) + env = (char *)HDmalloc((size_t)len + 1); + else if (HDstrlen(env) < (size_t)len) + env = (char *)HDrealloc(env, (size_t)len + 1); + + MPI_Bcast(env, len, MPI_CHAR, root, comm); + env[len] = '\0'; + } + else { + if (env) + HDfree(env); + env = NULL; + } + } +#ifndef NDEBUG + MPI_Barrier(comm); +#endif + } + else { + /* use original getenv */ + if (env) + HDfree(env); + env = HDgetenv(name); + } /* end if */ + + return env; +} + +/*------------------------------------------------------------------------- + * Function: h5_fixname_real + * + * Purpose: Create a file name from a file base name like `test' and + * return it through the FULLNAME (at most SIZE characters + * counting the null terminator). The full name is created by + * prepending the contents of HDF5_PREFIX (separated from the + * base name by a slash) and appending a file extension based on + * the driver supplied, resulting in something like + * `ufs:/u/matzke/test.h5'. + * + * Return: Success: The FULLNAME pointer. + * + * Failure: NULL if BASENAME or FULLNAME is the null + * pointer or if FULLNAME isn't large enough for + * the result. + * + * Programmer: Robb Matzke + * Thursday, November 19, 1998 + * + *------------------------------------------------------------------------- + */ +static char * +h5_fixname_real(const char *base_name, hid_t fapl, const char *_suffix, char *fullname, size_t size, + hbool_t nest_printf, hbool_t subst_for_superblock) +{ + const char *prefix = NULL; + const char *env = NULL; /* HDF5_DRIVER environment variable */ + char * ptr, last = '\0'; + const char *suffix = _suffix; + size_t i, j; + hid_t driver = -1; + int isppdriver = 0; /* if the driver is MPI parallel */ + + if (!base_name || !fullname || size < 1) + return NULL; + + HDmemset(fullname, 0, size); + + /* figure out the suffix */ + if (H5P_DEFAULT != fapl) { + if ((driver = H5Pget_driver(fapl)) < 0) + return NULL; + + if (suffix) { + if (H5FD_FAMILY == driver) { + if (subst_for_superblock) + suffix = "00000.h5"; + else + suffix = nest_printf ? "%%05d.h5" : "%05d.h5"; + } + else if (H5FD_MULTI == driver) { + + /* Get the environment variable, if it exists, in case + * we are using the split driver since both of those + * use the multi VFD under the hood. + */ + env = HDgetenv(HDF5_DRIVER); +#ifdef HDF5_DRIVER + /* Use the environment variable, then the compile-time constant */ + if (!env) + env = HDF5_DRIVER; +#endif + if (env && !HDstrcmp(env, "split")) { + /* split VFD */ + if (subst_for_superblock) + suffix = "-m.h5"; + else + suffix = NULL; + } + else { + /* multi VFD */ + if (subst_for_superblock) + suffix = "-s.h5"; + else + suffix = NULL; + } + } + } + } + + /* Must first check fapl is not H5P_DEFAULT (-1) because H5FD_XXX + * could be of value -1 if it is not defined. + */ + isppdriver = H5P_DEFAULT != fapl && (H5FD_MPIO == driver); + + /* Check what prefix to use for test files. Process HDF5_PARAPREFIX and + * HDF5_PREFIX. + * Use different ones depending on parallel or serial driver used. + * (The #ifdef is needed to prevent compile failure in case MPI is not + * configured.) + */ + if (isppdriver) { + /* + * For parallel: + * First use command line option, then the environment + * variable, then try the constant + */ + static int explained = 0; + + prefix = (paraprefix ? paraprefix : getenv_all(MPI_COMM_WORLD, 0, "HDF5_PARAPREFIX")); + + if (!prefix && !explained) { + /* print hint by process 0 once. */ + int mpi_rank; + + MPI_Comm_rank(MPI_COMM_WORLD, &mpi_rank); + + if (mpi_rank == 0) + HDprintf("*** Hint ***\n" + "You can use environment variable HDF5_PARAPREFIX to " + "run parallel test files in a\n" + "different directory or to add file type prefix. e.g.,\n" + " HDF5_PARAPREFIX=pfs:/PFS/user/me\n" + " export HDF5_PARAPREFIX\n" + "*** End of Hint ***\n"); + + explained = TRUE; +#ifdef HDF5_PARAPREFIX + prefix = HDF5_PARAPREFIX; +#endif /* HDF5_PARAPREFIX */ + } + } + else { + /* + * For serial: + * First use the environment variable, then try the constant + */ + prefix = HDgetenv("HDF5_PREFIX"); + +#ifdef HDF5_PREFIX + if (!prefix) + prefix = HDF5_PREFIX; +#endif /* HDF5_PREFIX */ + } + + /* Prepend the prefix value to the base name */ + if (prefix && *prefix) { + if (isppdriver) { + /* This is a parallel system */ + char *subdir; + + if (!HDstrcmp(prefix, HDF5_PARAPREFIX)) { + /* + * If the prefix specifies the HDF5_PARAPREFIX directory, then + * default to using the "/tmp/$USER" or "/tmp/$LOGIN" + * directory instead. + */ + char *user, *login; + + user = HDgetenv("USER"); + login = HDgetenv("LOGIN"); + subdir = (user ? user : login); + + if (subdir) { + for (i = 0; i < size && prefix[i]; i++) + fullname[i] = prefix[i]; + + fullname[i++] = '/'; + + for (j = 0; i < size && subdir[j]; ++i, ++j) + fullname[i] = subdir[j]; + } + } + + if (!fullname[0]) { + /* We didn't append the prefix yet */ + HDstrncpy(fullname, prefix, size); + fullname[size - 1] = '\0'; + } + + if (HDstrlen(fullname) + HDstrlen(base_name) + 1 < size) { + /* + * Append the base_name with a slash first. Multiple + * slashes are handled below. + */ + h5_stat_t buf; + + if (HDstat(fullname, &buf) < 0) + /* The directory doesn't exist just yet */ + if (HDmkdir(fullname, (mode_t)0755) < 0 && errno != EEXIST) + /* + * We couldn't make the "/tmp/${USER,LOGIN}" + * subdirectory. Default to PREFIX's original + * prefix value. + */ + HDstrcpy(fullname, prefix); + + HDstrcat(fullname, "/"); + HDstrcat(fullname, base_name); + } + else { + /* Buffer is too small */ + return NULL; + } + } + else { + if (HDsnprintf(fullname, size, "%s/%s", prefix, base_name) == (int)size) + /* Buffer is too small */ + return NULL; + } + } + else if (HDstrlen(base_name) >= size) { + /* Buffer is too small */ + return NULL; + } + else { + HDstrcpy(fullname, base_name); + } + + /* Append a suffix */ + if (suffix) { + if (HDstrlen(fullname) + HDstrlen(suffix) >= size) + return NULL; + + HDstrcat(fullname, suffix); + } + + /* Remove any double slashes in the filename */ + for (ptr = fullname, i = j = 0; ptr && i < size; i++, ptr++) { + if (*ptr != '/' || last != '/') + fullname[j++] = *ptr; + + last = *ptr; + } + + return fullname; +} + +/* + * Local variables: + * c-indent-level: 3 + * c-basic-offset: 3 + * tab-width: 3 + * End: + */ + +#else /* H5_HAVE_PARALLEL */ +/* dummy program since H5_HAVE_PARALLEL is not configured in */ +int +main(int H5_ATTR_UNUSED argc, char H5_ATTR_UNUSED **argv) +{ + printf("No parallel performance because parallel is not configured in\n"); + return (0); +} +#endif /* H5_HAVE_PARALLEL */ |