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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
* (C) 2006 by Argonne National Laboratory.
* See COPYRIGHT in top-level directory.
*/
/*
* Check that the timer produces monotone nondecreasing times and that
* the Tick is reasonable
*/
#include "mpi.h"
#include <stdio.h>
#include "mpitest.h"
static int verbose = 0;
#define MAX_TIMER_TEST 5000
int main(int argc, char *argv[])
{
double t1[MAX_TIMER_TEST], tick[MAX_TIMER_TEST], tickval;
double minDiff, maxDiff, diff;
int i, nZeros = 0;
int errs = 0;
MTest_Init(&argc, &argv);
for (i = 0; i < MAX_TIMER_TEST; i++) {
t1[i] = MPI_Wtime();
}
for (i = 0; i < MAX_TIMER_TEST; i++) {
tick[i] = MPI_Wtick();
}
/* Look at the values */
/* Look at the tick */
tickval = MPI_Wtick();
for (i = 0; i < MAX_TIMER_TEST; i++) {
if (tickval != tick[i]) {
fprintf(stderr, "Nonconstant value for MPI_Wtick: %e != %e\n", tickval, tick[i]);
errs++;
}
}
/* Look at the timer */
minDiff = 1.e20;
maxDiff = -1.0;
nZeros = 0;
for (i = 1; i < MAX_TIMER_TEST; i++) {
diff = t1[i] - t1[i - 1];
if (diff == 0.0)
nZeros++;
else if (diff < minDiff)
minDiff = diff;
if (diff > maxDiff)
maxDiff = diff;
}
/* Are the time diff values and tick values consistent */
if (verbose) {
printf("Tick = %e, timer range = [%e,%e]\n", tickval, minDiff, maxDiff);
if (nZeros)
printf("Wtime difference was 0 %d times\n", nZeros);
}
MTest_Finalize(errs);
return MTestReturnValue(errs);
}
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