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authorSiddhesh Poyarekar <siddhesh@redhat.com>2013-03-15 12:30:03 +0530
committerSiddhesh Poyarekar <siddhesh@redhat.com>2013-03-15 12:30:03 +0530
commit8cfdb7e0560ab27e70a1d2e898fb4a0a67a13c70 (patch)
tree7eb91b35e7d04f1c4889563b3c922e512cfe2045 /benchtests
parentMake mantissa type configurable (diff)
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Framework for performance benchmarking of functions
See benchtests/Makefile to know how to use it.
Diffstat (limited to 'benchtests')
-rw-r--r--benchtests/Makefile59
-rw-r--r--benchtests/bench-skeleton.c75
-rw-r--r--benchtests/exp-inputs1
-rw-r--r--benchtests/pow-inputs1
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