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76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
/* Skeleton for benchmark programs.
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Copyright (C) 2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <string.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <time.h>
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#include <inttypes.h>
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int
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main (int argc, char **argv)
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{
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unsigned long i, j, k;
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uint64_t total = 0, max = 0, min = 0x7fffffffffffffff;
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struct timespec start, end;
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memset (&start, 0, sizeof (start));
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memset (&end, 0, sizeof (end));
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clock_getres (CLOCK_PROCESS_CPUTIME_ID, &start);
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/* Measure 1000 times the resolution of the clock. So for a 1ns resolution
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clock, we measure 1000 iterations of the function call at a time.
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Measurements close to the minimum clock resolution won't make much sense,
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but it's better than having nothing at all. */
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unsigned long iters = 1000 * start.tv_nsec;
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unsigned long total_iters = ITER / iters;
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for (i = 0; i < NUM_SAMPLES; i++)
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{
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for (j = 0; j < total_iters; j ++)
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{
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clock_gettime (CLOCK_PROCESS_CPUTIME_ID, &start);
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for (k = 0; k < iters; k++)
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BENCH_FUNC(i);
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clock_gettime (CLOCK_PROCESS_CPUTIME_ID, &end);
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uint64_t cur = (end.tv_nsec - start.tv_nsec
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+ ((end.tv_sec - start.tv_sec)
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* (uint64_t) 1000000000));
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if (cur > max)
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max = cur;
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if (cur < min)
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min = cur;
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total += cur;
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}
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}
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double d_total_s = total * 1e-9;
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double d_iters = iters;
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double d_total_i = (double)ITER * NUM_SAMPLES;
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printf (FUNCNAME ": ITERS:%g: TOTAL:%gs, MAX:%gns, MIN:%gns, %g iter/s\n",
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d_total_i, d_total_s, max / d_iters, min / d_iters,
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d_total_i / d_total_s);
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return 0;
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}
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