diff options
Diffstat (limited to 'perform/pio_perf.c')
| -rw-r--r-- | perform/pio_perf.c | 361 |
1 files changed, 190 insertions, 171 deletions
diff --git a/perform/pio_perf.c b/perform/pio_perf.c index b9ce309..bb1880a 100644 --- a/perform/pio_perf.c +++ b/perform/pio_perf.c @@ -287,7 +287,7 @@ struct options { size_t blk_size; /* Block size */ unsigned interleaved; /* Interleaved vs. contiguous blocks */ unsigned collective; /* Collective vs. independent I/O */ - unsigned dim2d; /* 1D vs. 2D */ + unsigned dim2d; /* 1D vs. 2D geometry */ 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 */ @@ -453,8 +453,8 @@ run_test_loop(struct options *opts) /* do something harsh */ } - /* only processes doing PIO will run the tests */ - if (doing_pio){ + /* only processes doing PIO will run the tests */ + if (doing_pio){ output_report("Number of processors = %ld\n", parms.num_procs); /* multiply the xfer buffer size by 2 for each loop iteration */ @@ -462,33 +462,33 @@ run_test_loop(struct options *opts) buf_size <= opts->max_xfer_size; buf_size <<= 1) { parms.buf_size = buf_size; - if (parms.dim2d){ - parms.num_bytes = (off_t)pow((double)(opts->num_bpp*parms.num_procs),2); - if (parms.interleaved) - output_report("Transfer Buffer Size: %ldx%ld bytes, File size: %.2f MBs\n", - buf_size, opts->blk_size, - ((double)parms.num_dsets * (double)parms.num_bytes) - / ONE_MB); - else - output_report("Transfer Buffer Size: %ldx%ld bytes, File size: %.2f MBs\n", - opts->blk_size, buf_size, - ((double)parms.num_dsets * (double)parms.num_bytes) - / ONE_MB); - - print_indent(1); - output_report(" # of files: %ld, # of datasets: %ld, dataset size: %.2fx%.2f KBs\n", - parms.num_files, parms.num_dsets, (double)(opts->num_bpp*parms.num_procs)/ONE_KB, - (double)(opts->num_bpp*parms.num_procs)/ONE_KB); - } - else{ - parms.num_bytes = (off_t)opts->num_bpp*parms.num_procs; - output_report("Transfer Buffer Size: %ld bytes, File size: %.2f MBs\n", - buf_size,((double)parms.num_dsets * (double)parms.num_bytes) / ONE_MB); - - print_indent(1); - output_report(" # of files: %ld, # of datasets: %ld, dataset size: %.2f MBs\n", - parms.num_files, parms.num_dsets, (double)(opts->num_bpp*parms.num_procs)/ONE_MB); - } + if (parms.dim2d){ + parms.num_bytes = (off_t)pow((double)(opts->num_bpp*parms.num_procs),2); + if (parms.interleaved) + output_report("Transfer Buffer Size: %ldx%ld bytes, File size: %.2f MBs\n", + buf_size, opts->blk_size, + ((double)parms.num_dsets * (double)parms.num_bytes) + / ONE_MB); + else + output_report("Transfer Buffer Size: %ldx%ld bytes, File size: %.2f MBs\n", + opts->blk_size, buf_size, + ((double)parms.num_dsets * (double)parms.num_bytes) + / ONE_MB); + + print_indent(1); + output_report(" # of files: %ld, # of datasets: %ld, dataset size: %.2fx%.2f KBs\n", + parms.num_files, parms.num_dsets, (double)(opts->num_bpp*parms.num_procs)/ONE_KB, + (double)(opts->num_bpp*parms.num_procs)/ONE_KB); + } + else{ + parms.num_bytes = (off_t)opts->num_bpp*parms.num_procs; + output_report("Transfer Buffer Size: %ld bytes, File size: %.2f MBs\n", + buf_size,((double)parms.num_dsets * (double)parms.num_bytes) / ONE_MB); + + print_indent(1); + output_report(" # of files: %ld, # of datasets: %ld, dataset size: %.2f MBs\n", + parms.num_files, parms.num_dsets, (double)(opts->num_bpp*parms.num_procs)/ONE_MB); + } if (opts->io_types & PIO_POSIX) run_test(POSIXIO, parms, opts); @@ -507,7 +507,7 @@ run_test_loop(struct options *opts) if (destroy_comm_world() != SUCCESS) { /* do something harsh */ } - } + } } } @@ -533,10 +533,10 @@ run_test(iotype iot, parameters parms, struct options *opts) minmax *read_mm_table=NULL; minmax *read_gross_mm_table=NULL; minmax *read_raw_mm_table=NULL; - minmax *read_open_mm_table=NULL; - minmax *read_close_mm_table=NULL; - minmax *write_open_mm_table=NULL; - minmax *write_close_mm_table=NULL; + minmax *read_open_mm_table=NULL; + minmax *read_close_mm_table=NULL; + minmax *write_open_mm_table=NULL; + minmax *write_close_mm_table=NULL; minmax write_mpi_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}; @@ -545,10 +545,10 @@ run_test(iotype iot, parameters parms, struct options *opts) 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}; - minmax read_open_mm = {0.0, 0.0, 0.0, 0}; - minmax read_close_mm = {0.0, 0.0, 0.0, 0}; - minmax write_open_mm = {0.0, 0.0, 0.0, 0}; - minmax write_close_mm = {0.0, 0.0, 0.0, 0}; + minmax read_open_mm = {0.0, 0.0, 0.0, 0}; + minmax read_close_mm = {0.0, 0.0, 0.0, 0}; + minmax write_open_mm = {0.0, 0.0, 0.0, 0}; + minmax write_close_mm = {0.0, 0.0, 0.0, 0}; raw_size = (off_t)parms.num_dsets * (off_t)parms.num_bytes; parms.io_type = iot; @@ -582,14 +582,13 @@ run_test(iotype iot, parameters parms, struct options *opts) write_close_mm_table = calloc((size_t)parms.num_iters , sizeof(minmax)); if (!parms.h5_write_only) { - read_mpi_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)); - read_open_mm_table = calloc((size_t)parms.num_iters , sizeof(minmax)); - read_close_mm_table = calloc((size_t)parms.num_iters , sizeof(minmax)); - - } + read_mpi_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)); + read_open_mm_table = calloc((size_t)parms.num_iters , sizeof(minmax)); + read_close_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) { @@ -600,37 +599,37 @@ run_test(iotype iot, parameters parms, struct options *opts) /* gather all of the "mpi write" times */ t = get_time(res.timers, HDF5_MPI_WRITE); - get_minmax(&write_mpi_mm, t); + get_minmax(&write_mpi_mm, t); write_mpi_mm_table[i] = write_mpi_mm; /* gather all of the "write" times */ t = get_time(res.timers, HDF5_FINE_WRITE_FIXED_DIMS); - get_minmax(&write_mm, t); + 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); + 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); + t = get_time(res.timers, HDF5_RAW_WRITE_FIXED_DIMS); + get_minmax(&write_raw_mm, t); - write_raw_mm_table[i] = write_raw_mm; + write_raw_mm_table[i] = write_raw_mm; - /* gather all of the file open times (time from open to first write) */ - t = get_time(res.timers, HDF5_FILE_WRITE_OPEN); - get_minmax(&write_open_mm, t); + /* gather all of the file open times (time from open to first write) */ + t = get_time(res.timers, HDF5_FILE_WRITE_OPEN); + get_minmax(&write_open_mm, t); - write_open_mm_table[i] = write_open_mm; + write_open_mm_table[i] = write_open_mm; - /* gather all of the file close times (time from last write to close) */ - t = get_time(res.timers, HDF5_FILE_WRITE_CLOSE); - get_minmax(&write_close_mm, t); + /* gather all of the file close times (time from last write to close) */ + t = get_time(res.timers, HDF5_FILE_WRITE_CLOSE); + get_minmax(&write_close_mm, t); write_close_mm_table[i] = write_close_mm; @@ -659,21 +658,21 @@ run_test(iotype iot, parameters parms, struct options *opts) read_raw_mm_table[i] = read_raw_mm; - /* gather all of the file open times (time from open to first read) */ - t = get_time(res.timers, HDF5_FILE_READ_OPEN); - get_minmax(&read_open_mm, t); + /* gather all of the file open times (time from open to first read) */ + t = get_time(res.timers, HDF5_FILE_READ_OPEN); + get_minmax(&read_open_mm, t); - read_open_mm_table[i] = read_open_mm; + read_open_mm_table[i] = read_open_mm; - /* gather all of the file close times (time from last read to close) */ - t = get_time(res.timers, HDF5_FILE_READ_CLOSE); - get_minmax(&read_close_mm, t); + /* gather all of the file close times (time from last read to close) */ + t = get_time(res.timers, HDF5_FILE_READ_CLOSE); + get_minmax(&read_close_mm, t); - read_close_mm_table[i] = read_close_mm; + read_close_mm_table[i] = read_close_mm; - } + } - pio_time_destroy(res.timers); + pio_time_destroy(res.timers); } /* @@ -722,25 +721,22 @@ run_test(iotype iot, parameters parms, struct options *opts) } output_results(opts,"Write Open-Close",write_gross_mm_table,parms.num_iters,raw_size); - /* Print out time from open to first write */ if (pio_debug_level >= 3) { - /* output all of the times for all iterations */ - print_indent(3); - output_report("Write file open details:\n"); - output_all_info(write_open_mm_table, parms.num_iters, 4); + /* output all of the times for all iterations */ + print_indent(3); + output_report("Write file open details:\n"); + output_all_info(write_open_mm_table, parms.num_iters, 4); } /* Print out time from last write to close */ if (pio_debug_level >= 3) { - /* output all of the times for all iterations */ - print_indent(3); - output_report("Write file close details:\n"); - output_all_info(write_close_mm_table, parms.num_iters, 4); + /* output all of the times for all iterations */ + print_indent(3); + output_report("Write file close details:\n"); + output_all_info(write_close_mm_table, parms.num_iters, 4); } - - if (!parms.h5_write_only) { /* Read statistics */ /* Print the raw data throughput if desired */ @@ -785,25 +781,24 @@ run_test(iotype iot, parameters parms, struct options *opts) 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); - + output_results(opts, "Read Open-Close", read_gross_mm_table, + parms.num_iters, raw_size); - /* Print out time from open to first read */ - if (pio_debug_level >= 3) { - /* output all of the times for all iterations */ - print_indent(3); - output_report("Read file open details:\n"); - output_all_info(read_open_mm_table, parms.num_iters, 4); - } + /* Print out time from open to first read */ + if (pio_debug_level >= 3) { + /* output all of the times for all iterations */ + print_indent(3); + output_report("Read file open details:\n"); + output_all_info(read_open_mm_table, parms.num_iters, 4); + } - /* Print out time from last read to close */ - if (pio_debug_level >= 3) { - /* output all of the times for all iterations */ - print_indent(3); - output_report("Read file close details:\n"); - output_all_info(read_close_mm_table, parms.num_iters, 4); - } + /* Print out time from last read to close */ + if (pio_debug_level >= 3) { + /* output all of the times for all iterations */ + print_indent(3); + output_report("Read file close details:\n"); + output_all_info(read_close_mm_table, parms.num_iters, 4); + } } @@ -820,8 +815,8 @@ run_test(iotype iot, parameters parms, struct options *opts) free(read_mm_table); free(read_gross_mm_table); free(read_raw_mm_table); - free(read_open_mm_table); - free(read_close_mm_table); + free(read_open_mm_table); + free(read_close_mm_table); } return ret_value; @@ -1126,58 +1121,58 @@ report_parameters(struct options *opts) opts->min_num_procs, opts->max_num_procs); if (opts->dim2d){ - HDfprintf(output, "rank %d: Number of bytes per process per dataset=", rank); - recover_size_and_print((long_long)(opts->num_bpp * opts->num_bpp * opts->min_num_procs), ":"); - recover_size_and_print((long_long)(opts->num_bpp * opts->num_bpp * opts->max_num_procs), "\n"); - - HDfprintf(output, "rank %d: Size of dataset(s)=", rank); - recover_size_and_print((long_long)(opts->num_bpp * opts->min_num_procs), "x"); - recover_size_and_print((long_long)(opts->num_bpp * opts->min_num_procs), ":"); - recover_size_and_print((long_long)(opts->num_bpp * opts->max_num_procs), "x"); - recover_size_and_print((long_long)(opts->num_bpp * opts->max_num_procs), "\n"); - - HDfprintf(output, "rank %d: File size=", rank); - recover_size_and_print((long_long)(pow(opts->num_bpp * opts->min_num_procs,2) - * opts->num_dsets), ":"); - recover_size_and_print((long_long)(pow(opts->num_bpp * opts->max_num_procs,2) - * opts->num_dsets), "\n"); - - HDfprintf(output, "rank %d: Transfer buffer size=", rank); - if(opts->interleaved){ - recover_size_and_print((long_long)opts->min_xfer_size, "x"); - recover_size_and_print((long_long)opts->blk_size, ":"); - recover_size_and_print((long_long)opts->max_xfer_size, "x"); - recover_size_and_print((long_long)opts->blk_size, "\n"); - } - else{ - recover_size_and_print((long_long)opts->blk_size, "x"); - recover_size_and_print((long_long)opts->min_xfer_size, ":"); - recover_size_and_print((long_long)opts->blk_size, "x"); - recover_size_and_print((long_long)opts->max_xfer_size, "\n"); - } - HDfprintf(output, "rank %d: Block size=", rank); - recover_size_and_print((long_long)opts->blk_size, "x"); - recover_size_and_print((long_long)opts->blk_size, "\n"); + HDfprintf(output, "rank %d: Number of bytes per process per dataset=", rank); + recover_size_and_print((long_long)(opts->num_bpp * opts->num_bpp * opts->min_num_procs), ":"); + recover_size_and_print((long_long)(opts->num_bpp * opts->num_bpp * opts->max_num_procs), "\n"); + + HDfprintf(output, "rank %d: Size of dataset(s)=", rank); + recover_size_and_print((long_long)(opts->num_bpp * opts->min_num_procs), "x"); + recover_size_and_print((long_long)(opts->num_bpp * opts->min_num_procs), ":"); + recover_size_and_print((long_long)(opts->num_bpp * opts->max_num_procs), "x"); + recover_size_and_print((long_long)(opts->num_bpp * opts->max_num_procs), "\n"); + + HDfprintf(output, "rank %d: File size=", rank); + recover_size_and_print((long_long)(pow(opts->num_bpp * opts->min_num_procs,2) + * opts->num_dsets), ":"); + recover_size_and_print((long_long)(pow(opts->num_bpp * opts->max_num_procs,2) + * opts->num_dsets), "\n"); + + HDfprintf(output, "rank %d: Transfer buffer size=", rank); + if(opts->interleaved){ + recover_size_and_print((long_long)opts->min_xfer_size, "x"); + recover_size_and_print((long_long)opts->blk_size, ":"); + recover_size_and_print((long_long)opts->max_xfer_size, "x"); + recover_size_and_print((long_long)opts->blk_size, "\n"); + } + else{ + recover_size_and_print((long_long)opts->blk_size, "x"); + recover_size_and_print((long_long)opts->min_xfer_size, ":"); + recover_size_and_print((long_long)opts->blk_size, "x"); + recover_size_and_print((long_long)opts->max_xfer_size, "\n"); + } + HDfprintf(output, "rank %d: Block size=", rank); + recover_size_and_print((long_long)opts->blk_size, "x"); + recover_size_and_print((long_long)opts->blk_size, "\n"); } else{ - HDfprintf(output, "rank %d: Number of bytes per process per dataset=", rank); - recover_size_and_print((long_long)opts->num_bpp, "\n"); - - HDfprintf(output, "rank %d: Size of dataset(s)=", rank); - recover_size_and_print((long_long)(opts->num_bpp * opts->min_num_procs), ":"); - recover_size_and_print((long_long)(opts->num_bpp * opts->max_num_procs), "\n"); - - HDfprintf(output, "rank %d: File size=", rank); - recover_size_and_print((long_long)(opts->num_bpp * opts->min_num_procs - * opts->num_dsets), ":"); - recover_size_and_print((long_long)(opts->num_bpp * opts->max_num_procs - * opts->num_dsets), "\n"); - - HDfprintf(output, "rank %d: Transfer buffer size=", rank); - recover_size_and_print((long_long)opts->min_xfer_size, ":"); - recover_size_and_print((long_long)opts->max_xfer_size, "\n"); - HDfprintf(output, "rank %d: Block size=", rank); - recover_size_and_print((long_long)opts->blk_size, "\n"); + HDfprintf(output, "rank %d: Number of bytes per process per dataset=", rank); + recover_size_and_print((long_long)opts->num_bpp, "\n"); + + HDfprintf(output, "rank %d: Size of dataset(s)=", rank); + recover_size_and_print((long_long)(opts->num_bpp * opts->min_num_procs), ":"); + recover_size_and_print((long_long)(opts->num_bpp * opts->max_num_procs), "\n"); + + HDfprintf(output, "rank %d: File size=", rank); + recover_size_and_print((long_long)(opts->num_bpp * opts->min_num_procs + * opts->num_dsets), ":"); + recover_size_and_print((long_long)(opts->num_bpp * opts->max_num_procs + * opts->num_dsets), "\n"); + + HDfprintf(output, "rank %d: Transfer buffer size=", rank); + recover_size_and_print((long_long)opts->min_xfer_size, ":"); + recover_size_and_print((long_long)opts->max_xfer_size, "\n"); + HDfprintf(output, "rank %d: Block size=", rank); + recover_size_and_print((long_long)opts->blk_size, "\n"); } HDfprintf(output, "rank %d: Block Pattern in Dataset=", rank); @@ -1245,13 +1240,13 @@ parse_command_line(int argc, char *argv[]) cl_opts->io_types = 0; /* will set default after parsing options */ cl_opts->num_dsets = 1; cl_opts->num_files = 1; - cl_opts->num_bpp = 256 * ONE_KB; + cl_opts->num_bpp = 0; cl_opts->num_iters = 1; cl_opts->max_num_procs = comm_world_nprocs_g; cl_opts->min_num_procs = 1; - cl_opts->max_xfer_size = 1 * ONE_MB; - cl_opts->min_xfer_size = 128 * ONE_KB; - cl_opts->blk_size = 128 * ONE_KB; /* Default to writing 128K per block */ + cl_opts->max_xfer_size = 0; + cl_opts->min_xfer_size = 0; + cl_opts->blk_size = 0; cl_opts->interleaved = 0; /* Default to contiguous blocks in dataset */ cl_opts->collective = 0; /* Default to independent I/O access */ cl_opts->dim2d = 0; /* Default to 1D */ @@ -1361,10 +1356,10 @@ parse_command_line(int argc, char *argv[]) /* Turn on time printing */ cl_opts->print_times = TRUE; break; - case 'v': + case 'v': /* Turn on verify data correctness*/ - cl_opts->verify = TRUE; - break; + cl_opts->verify = TRUE; + break; default: fprintf(stderr, "pio_perf: invalid --debug option %s\n", buf); exit(EXIT_FAILURE); @@ -1428,28 +1423,50 @@ parse_command_line(int argc, char *argv[]) } } + + if (cl_opts->num_bpp == 0){ + if (cl_opts->dim2d == 0) + cl_opts->num_bpp = 256 * ONE_KB; + else + cl_opts->num_bpp = 8 * ONE_KB; + } + + if (cl_opts->max_xfer_size == 0) + cl_opts->max_xfer_size = cl_opts->num_bpp; + + if (cl_opts->min_xfer_size == 0) + cl_opts->min_xfer_size = (cl_opts->num_bpp)/2; + + if (cl_opts->blk_size == 0) + cl_opts->blk_size = (cl_opts->num_bpp)/2; + + /* set default if none specified yet */ if (!cl_opts->io_types) - cl_opts->io_types = PIO_HDF5 | PIO_MPI | PIO_POSIX; /* run all API */ + cl_opts->io_types = PIO_HDF5 | PIO_MPI | PIO_POSIX; /* run all API */ /* verify parameters sanity. Adjust if needed. */ /* cap xfer_size with bytes per process */ - if (cl_opts->min_xfer_size > cl_opts->num_bpp) - cl_opts->min_xfer_size = cl_opts->num_bpp; - if (cl_opts->max_xfer_size > cl_opts->num_bpp) - cl_opts->max_xfer_size = cl_opts->num_bpp; + if (!cl_opts->dim2d) { + if (cl_opts->min_xfer_size > cl_opts->num_bpp) + cl_opts->min_xfer_size = cl_opts->num_bpp; + if (cl_opts->max_xfer_size > cl_opts->num_bpp) + cl_opts->max_xfer_size = cl_opts->num_bpp; + } if (cl_opts->min_xfer_size > cl_opts->max_xfer_size) - cl_opts->min_xfer_size = cl_opts->max_xfer_size; + cl_opts->min_xfer_size = cl_opts->max_xfer_size; + if (cl_opts->blk_size > cl_opts->num_bpp ) + cl_opts->blk_size = cl_opts->num_bpp; /* check range of number of processes */ if (cl_opts->min_num_procs <= 0) - cl_opts->min_num_procs = 1; + cl_opts->min_num_procs = 1; if (cl_opts->max_num_procs <= 0) - cl_opts->max_num_procs = 1; + cl_opts->max_num_procs = 1; if (cl_opts->min_num_procs > cl_opts->max_num_procs) - cl_opts->min_num_procs = cl_opts->max_num_procs; + cl_opts->min_num_procs = cl_opts->max_num_procs; /* check iteration */ if (cl_opts->num_iters <= 0) - cl_opts->num_iters = 1; + cl_opts->num_iters = 1; return cl_opts; } @@ -1530,7 +1547,7 @@ usage(const char *prog) #endif /* 0 */ printf(" -B S, --block-size=S Block size within transfer buffer\n"); printf(" (see below for description)\n"); - printf(" [default:128K]\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"); @@ -1538,7 +1555,7 @@ usage(const char *prog) 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]\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"); @@ -1553,8 +1570,10 @@ usage(const char *prog) 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 [default: 128K]\n"); - printf(" -X S, --max-xfer-size=S Maximum transfer buffer size [default: 1M]\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"); |