1 /* Copyright (c) 2009-2022. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
7 /* This example should be instructive to learn about SMPI_SAMPLE_LOCAL and
8 SMPI_SAMPLE_GLOBAL macros for execution sampling */
13 static double compute(double d0)
16 for (int j = 0; j < 100 * 1000 * 1000; j++) { /* 100 kflop */
26 int main(int argc, char *argv[])
30 MPI_Init(&argc, &argv);
31 int verbose = argc <= 1;
32 MPI_Comm_size(MPI_COMM_WORLD, &n);
33 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
35 /* I want no more than n + 1 benchs (thres < 0) */
36 SMPI_SAMPLE_GLOBAL(int i = 0, i < 5, i++, n + 1, -1){
38 fprintf(stderr, "(%12.6f) [rank:%d]", MPI_Wtime(), rank);
40 fprintf(stderr, "(0)");
41 fprintf(stderr, " Run the first computation. It's globally benched, "
42 "and I want no more than %d benchmarks (thres<0)\n", n + 1);
46 //tagged version, should differentiate between two different calls to the same kernel and run calibration even on the second one
47 for (int tag=0; tag < 4; tag++){
49 //run twice with the same tag, test should skip 1 and 3, as they were already benched.
50 sprintf(ctag, "%d", tag - tag%2);
51 SMPI_SAMPLE_GLOBAL_TAG(int i = 0, i < 500, i++, 2, 0.1, ctag){
53 fprintf(stderr, "(%12.6f) [rank:%d]", MPI_Wtime(), rank);
55 fprintf(stderr, "(0)");
56 fprintf(stderr, " Run the computation %d with tag %d\n", tag, tag- tag%2);
62 //Use 0 as max iter, but one will always be performed by design.
63 SMPI_SAMPLE_LOCAL (int i = 0, i < 5, i++,0, 0.1){
64 if (verbose || n < 2) {
67 fprintf(stderr, "(%12.6f)", MPI_Wtime());
69 fprintf(stderr, "(1)");
71 " [rank:%d] Run the second (locally benched) computation. It's locally benched, and I want the "
72 "standard error to go below 0.1 second (count is not >0)\n", rank);
78 fprintf(stderr, "(%12.6f) [rank:%d] The result of the computation is: %f\n", MPI_Wtime(), rank, d);
80 fprintf(stderr, "(2) [rank:%d] Done.\n", rank);