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author | Siddhesh Poyarekar <siddhesh@redhat.com> | 2013-03-15 12:30:03 +0530 |
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committer | Siddhesh Poyarekar <siddhesh@redhat.com> | 2013-03-15 12:30:03 +0530 |
commit | 8cfdb7e0560ab27e70a1d2e898fb4a0a67a13c70 (patch) | |
tree | 7eb91b35e7d04f1c4889563b3c922e512cfe2045 /benchtests | |
parent | Make mantissa type configurable (diff) | |
download | glibc-8cfdb7e0560ab27e70a1d2e898fb4a0a67a13c70.tar.gz glibc-8cfdb7e0560ab27e70a1d2e898fb4a0a67a13c70.tar.bz2 glibc-8cfdb7e0560ab27e70a1d2e898fb4a0a67a13c70.zip |
Framework for performance benchmarking of functions
See benchtests/Makefile to know how to use it.
Diffstat (limited to 'benchtests')
-rw-r--r-- | benchtests/Makefile | 59 | ||||
-rw-r--r-- | benchtests/bench-skeleton.c | 75 | ||||
-rw-r--r-- | benchtests/exp-inputs | 1 | ||||
-rw-r--r-- | benchtests/pow-inputs | 1 |
4 files changed, 136 insertions, 0 deletions
diff --git a/benchtests/Makefile b/benchtests/Makefile new file mode 100644 index 0000000000..74938b925c --- /dev/null +++ b/benchtests/Makefile @@ -0,0 +1,59 @@ +# Copyright (C) 2013 Free Software Foundation, Inc. +# This file is part of the GNU C Library. + +# The GNU C Library is free software; you can redistribute it and/or +# modify it under the terms of the GNU Lesser General Public +# License as published by the Free Software Foundation; either +# version 2.1 of the License, or (at your option) any later version. + +# The GNU C Library is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# Lesser General Public License for more details. + +# You should have received a copy of the GNU Lesser General Public +# License along with the GNU C Library; if not, see +# <http://www.gnu.org/licenses/>. + + +# Makefile for benchmark tests. The only useful target here is `bench`. + +# Adding a new function `foo`: +# --------------------------- + +# - Append the function name to the bench variable + +# - Define foo-ITER with the number of iterations you want to run. Keep it +# high enough that the overhead of clock_gettime is only a small fraction of +# the total run time of the test. + +# - Define foo-ARGLIST as a colon separated list of types of the input +# arguments. Use `void` if function does not take any inputs. Put in quotes +# if the input argument is a pointer, e.g.: + +# malloc-ARGLIST: "void *" + +# - Define foo-RET as the type the function returns. Skip if the function +# returns void. One could even skip foo-ARGLIST if the function does not +# take any inputs AND the function returns void. + + +# - Make a file called `foo-inputs` with one input value per line, an input +# being a comma separated list of arguments to be passed into the function. +# See pow-inputs for an example. + +subdir := benchtests +bench := exp pow + +exp-ITER = 100000 +exp-ARGLIST = double +exp-RET = double +LDFLAGS-bench-exp = -lm + +pow-ITER = 100000 +pow-ARGLIST = double:double +pow-RET = double +LDFLAGS-bench-pow = -lm + +include ../Makeconfig +include ../Rules diff --git a/benchtests/bench-skeleton.c b/benchtests/bench-skeleton.c new file mode 100644 index 0000000000..13f986d817 --- /dev/null +++ b/benchtests/bench-skeleton.c @@ -0,0 +1,75 @@ +/* Skeleton for benchmark programs. + Copyright (C) 2013 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <string.h> +#include <stdint.h> +#include <stdio.h> +#include <time.h> +#include <inttypes.h> + +int +main (int argc, char **argv) +{ + unsigned long i, j, k; + uint64_t total = 0, max = 0, min = 0x7fffffffffffffff; + struct timespec start, end; + + memset (&start, 0, sizeof (start)); + memset (&end, 0, sizeof (end)); + + clock_getres (CLOCK_PROCESS_CPUTIME_ID, &start); + + /* Measure 1000 times the resolution of the clock. So for a 1ns resolution + clock, we measure 1000 iterations of the function call at a time. + Measurements close to the minimum clock resolution won't make much sense, + but it's better than having nothing at all. */ + unsigned long iters = 1000 * start.tv_nsec; + unsigned long total_iters = ITER / iters; + + for (i = 0; i < NUM_SAMPLES; i++) + { + for (j = 0; j < total_iters; j ++) + { + clock_gettime (CLOCK_PROCESS_CPUTIME_ID, &start); + for (k = 0; k < iters; k++) + BENCH_FUNC(i); + clock_gettime (CLOCK_PROCESS_CPUTIME_ID, &end); + + uint64_t cur = (end.tv_nsec - start.tv_nsec + + ((end.tv_sec - start.tv_sec) + * (uint64_t) 1000000000)); + + if (cur > max) + max = cur; + + if (cur < min) + min = cur; + + total += cur; + } + } + + double d_total_s = total * 1e-9; + double d_iters = iters; + double d_total_i = (double)ITER * NUM_SAMPLES; + printf (FUNCNAME ": ITERS:%g: TOTAL:%gs, MAX:%gns, MIN:%gns, %g iter/s\n", + d_total_i, d_total_s, max / d_iters, min / d_iters, + d_total_i / d_total_s); + + return 0; +} diff --git a/benchtests/exp-inputs b/benchtests/exp-inputs new file mode 100644 index 0000000000..a2086baa86 --- /dev/null +++ b/benchtests/exp-inputs @@ -0,0 +1 @@ +708.00096423260981737257679924368858 diff --git a/benchtests/pow-inputs b/benchtests/pow-inputs new file mode 100644 index 0000000000..dbb1270b75 --- /dev/null +++ b/benchtests/pow-inputs @@ -0,0 +1 @@ +1.0000000000000020, 1.5 |