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/*********************************************************************
*
* Copyright (C) 2014, Northwestern University and Argonne National Laboratory
* See COPYRIGHT notice in top-level directory.
*
*********************************************************************/
/* $Id$ */
/*
* prints all MPI-IO hints used
* To compile:
* mpicxx -O2 get_info.c -o get_info -lpnetcdf
* To run:
* mpiexec -n 4 ./get_info [filename]
*
* Example standard output:
MPI File Info: nkeys = 17
MPI File Info: [ 0] key = cb_buffer_size, value = 16777216
MPI File Info: [ 1] key = romio_cb_read, value = automatic
MPI File Info: [ 2] key = romio_cb_write, value = automatic
MPI File Info: [ 3] key = cb_nodes, value = 1
MPI File Info: [ 4] key = romio_no_indep_rw, value = false
MPI File Info: [ 5] key = romio_cb_pfr, value = disable
MPI File Info: [ 6] key = romio_cb_fr_types, value = aar
MPI File Info: [ 7] key = romio_cb_fr_alignment, value = 1
MPI File Info: [ 8] key = romio_cb_ds_threshold, value = 0
MPI File Info: [ 9] key = romio_cb_alltoall, value = automatic
MPI File Info: [10] key = ind_rd_buffer_size, value = 4194304
MPI File Info: [11] key = ind_wr_buffer_size, value = 524288
MPI File Info: [12] key = romio_ds_read, value = automatic
MPI File Info: [13] key = romio_ds_write, value = automatic
MPI File Info: [14] key = cb_config_list, value = *:1
MPI File Info: [15] key = nc_var_align_size, value = 512
MPI File Info: [16] key = nc_header_read_chunk_size, value = 0
*/
#include <stdio.h>
#include <stdlib.h>
#include <iostream>
using namespace std;
#include <string.h> /* strcpy(), strncpy() */
#include <unistd.h> /* getopt() */
#include <pnetcdf>
using namespace PnetCDF;
using namespace PnetCDF::exceptions;
static void
usage(char *argv0)
{
cerr <<
"Usage: %s [-h] | [-q] [file_name]\n"
" [-h] Print help\n"
" [-q] Quiet mode (reports when fail)\n"
" [filename] output netCDF file name\n"
<< argv0;
}
/*----< print_info() >------------------------------------------------------*/
static
void print_info(MPI_Info *info_used)
{
int i, nkeys;
MPI_Info_get_nkeys(*info_used, &nkeys);
printf("MPI File Info: nkeys = %d\n",nkeys);
for (i=0; i<nkeys; i++) {
char key[MPI_MAX_INFO_KEY], value[MPI_MAX_INFO_VAL];
int valuelen, flag;
MPI_Info_get_nthkey(*info_used, i, key);
MPI_Info_get_valuelen(*info_used, key, &valuelen, &flag);
MPI_Info_get(*info_used, key, valuelen+1, value, &flag);
printf("MPI File Info: [%2d] key = %25s, value = %s\n",i,key,value);
}
}
/*----< main() >------------------------------------------------------------*/
int main(int argc, char **argv)
{
extern int optind;
char filename[256];
int i, rank, verbose=1;
MPI_Info info_used;
MPI_Init(&argc,&argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
/* get command-line arguments */
while ((i = getopt(argc, argv, "hq")) != EOF)
switch(i) {
case 'q': verbose = 0;
break;
case 'h':
default: if (rank==0) usage(argv[0]);
MPI_Finalize();
return 1;
}
if (argv[optind] == NULL) strcpy(filename, "testfile.nc");
else snprintf(filename, 256, "%s", argv[optind]);
try {
/* create the file */
NcmpiFile ncFile(MPI_COMM_WORLD, filename, NcmpiFile::replace,
NcmpiFile::classic5);
/* get all the default hints used */
ncFile.Inq_file_info(&info_used);
}
catch(NcmpiException& e) {
cout << e.what() << " error code=" << e.errorCode() << " Error!\n";
return 1;
}
if (rank == 0 && verbose) print_info(&info_used);
MPI_Info_free(&info_used);
/* check if there is any PnetCDF internal malloc residue */
MPI_Offset malloc_size, sum_size;
int err = ncmpi_inq_malloc_size(&malloc_size);
if (err == NC_NOERR) {
MPI_Reduce(&malloc_size, &sum_size, 1, MPI_OFFSET, MPI_SUM, 0, MPI_COMM_WORLD);
if (rank == 0 && sum_size > 0)
printf("heap memory allocated by PnetCDF internally has %lld bytes yet to be freed\n",
sum_size);
}
MPI_Finalize();
return 0;
}
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