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[v2][PATCH] Framework for performance benchmarking of functions


Hi,

Here's an updated version of this patch.  The programs were not using
the built libraries and were instead using the system libraries.

Siddhesh

	* Makefile.in (bench): New target.
	* Rules (bench): Likewise.
	(binaries-bench): Generate binaries for functions to
	benchmark.
	* benchtests/Makefile: New makefile for benchmark tests.
	* benchtests/bench-skeleton.c: New skeleton file for benchmark
	programs.
	* benchtests/exp-inputs: New input file for EXP function.
	* benchtests/pow-inputs: New input file for POW function.
	* scripts/bench.pl: New script to generate source files for
	benchmark programs.
 

diff --git a/Makefile.in b/Makefile.in
index d73a78f..df75b8f 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -3,7 +3,7 @@ srcdir = @srcdir@
 # Uncomment the line below if you want to do parallel build.
 # PARALLELMFLAGS = -j 4
 
-.PHONY: all install
+.PHONY: all install bench
 
 all .DEFAULT:
 	$(MAKE) -r PARALLELMFLAGS="$(PARALLELMFLAGS)" -C $(srcdir) objdir=`pwd` $@
@@ -11,3 +11,6 @@ all .DEFAULT:
 install:
 	LANGUAGE=C LC_ALL=C; export LANGUAGE LC_ALL; \
 	$(MAKE) -r PARALLELMFLAGS="$(PARALLELMFLAGS)" -C $(srcdir) objdir=`pwd` $@
+
+bench:
+	$(MAKE) -C $(srcdir)/benchtests $(PARALLELMFLAGS) objdir=`pwd` $@
diff --git a/Rules b/Rules
index 5c5aa60..ff35d4e 100644
--- a/Rules
+++ b/Rules
@@ -83,7 +83,7 @@ common-generated += dummy.o dummy.c
 
 # This makes all the auxiliary and test programs.
 
-.PHONY: others tests
+.PHONY: others tests bench
 ifeq ($(multi-arch),no)
 tests := $(filter-out $(tests-ifunc), $(tests))
 xtests := $(filter-out $(xtests-ifunc), $(xtests))
@@ -191,6 +191,31 @@ $(objpfx)%.out: /dev/null $(objpfx)%	# Make it 2nd arg for canned sequence.
 	$(make-test-out) > $@
 
 endif	# tests
+
+# Build and run benchmark programs.
+binaries-bench := $(addprefix $(objpfx)bench-,$(bench))
+
+run-bench = $(test-wrapper-env) \
+	    GCONV_PATH=$(common-objpfx)iconvdata LC_ALL=C \
+	    $($*-ENV) $(run-via-rtld-prefix) $${run}
+
+bench: $(binaries-bench)
+	if [ -f $(objpfx)bench.out ]; then \
+	  mv -f $(objpfx)bench.out $(objpfx)bench.out.old; \
+	fi
+	for run in $^; do \
+	  $(run-bench) >>  $(objpfx)bench.out; \
+	done
+
+$(binaries-bench): %: %.o \
+  $(sort $(filter $(common-objpfx)lib%,$(link-libc))) \
+  $(addprefix $(csu-objpfx),start.o) $(+preinit) $(+postinit)
+	$(+link)
+
+$(objpfx)bench-%.c: %-inputs bench-skeleton.c
+	$(..)scripts/bench.pl $(patsubst %-inputs,%,$<) \
+	  $($*-ITER) $($*-ARGLIST) $($*-RET) > $@
+
 
 .PHONY: distclean realclean subdir_distclean subdir_realclean \
 	subdir_clean subdir_mostlyclean subdir_testclean
diff --git a/benchtests/Makefile b/benchtests/Makefile
new file mode 100644
index 0000000..7e514f0
--- /dev/null
+++ b/benchtests/Makefile
@@ -0,0 +1,57 @@
+# 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
+
+# - 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 0000000..1dd1de7
--- /dev/null
+++ b/benchtests/bench-skeleton.c
@@ -0,0 +1,57 @@
+/* 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>
+
+int
+main (int argc, char **argv)
+{
+  int i, j;
+  int64_t total = 0, max = 0, min = 0x7fffffffffffffff;
+  struct timespec start, end;
+
+  memset (&start, 0, sizeof (start));
+  memset (&end, 0, sizeof (end));
+
+  for (i = 0; i < ITER; i++)
+    {
+      for (j = 0; j < NUM_SAMPLES; j++)
+	{
+	  clock_gettime (CLOCK_MONOTONIC_RAW, &start);
+	  BENCH_FUNC(j);
+	  clock_gettime (CLOCK_MONOTONIC_RAW, &end);
+
+	  int64_t cur = (end.tv_nsec - start.tv_nsec
+			 + (end.tv_sec - start.tv_sec) * 1000000000);
+
+	  if (cur > max)
+	    max = cur;
+
+	  if (cur < min)
+	    min = cur;
+
+	  total += cur;
+	}
+    }
+
+  printf (FUNCNAME ": TOTAL: %ldns, MAX: %ldns, MIN: %ldns, AVG: %lfns\n",
+	  total, max, min, (double) total / (ITER * NUM_SAMPLES));
+}
diff --git a/benchtests/exp-inputs b/benchtests/exp-inputs
new file mode 100644
index 0000000..713c222
--- /dev/null
+++ b/benchtests/exp-inputs
@@ -0,0 +1 @@
+42.0
diff --git a/benchtests/pow-inputs b/benchtests/pow-inputs
new file mode 100644
index 0000000..2f7cc03
--- /dev/null
+++ b/benchtests/pow-inputs
@@ -0,0 +1 @@
+42.0, 42.0
diff --git a/scripts/bench.pl b/scripts/bench.pl
new file mode 100755
index 0000000..3c01db9
--- /dev/null
+++ b/scripts/bench.pl
@@ -0,0 +1,82 @@
+#! /usr/bin/perl -w
+# 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/>.
+
+
+use strict;
+use warnings;
+# Generate a benchmark source file for a given input.
+
+if ($#ARGV lt 1) {
+  die "Usage: bench.pl <function> <iterations> [parameter types] [return type]"
+}
+
+my $arg;
+my $func = $ARGV[0];
+my $iters = $ARGV[1];
+my @args;
+my $ret = "void";
+
+if ($#ARGV ge 2) {
+  @args = split(':', $ARGV[2]);
+}
+
+if ($#ARGV eq 3) {
+  $ret = $ARGV[3];
+}
+
+my $decl = "extern $ret $func (";
+
+if ($#args lt 0 || $args[0] eq "void") {
+  print "$decl void);\n";
+  print "#define BENCH_FUNC(j) $func();\n";
+  print "#define NUM_SAMPLES (1)\n";
+}
+else {
+  my $num = 0;
+  my $bench_func = "#define BENCH_FUNC(j) $func (";
+  my $struct = "struct args {";
+
+  foreach $arg (@args) {
+    if ($num gt 0) {
+      $bench_func = "$bench_func,";
+      $decl = "$decl,";
+    }
+
+    $struct = "$struct $arg arg$num;";
+    $bench_func = "$bench_func in[j].arg$num";
+    $decl = "$decl $arg";
+    $num = $num + 1;
+  }
+
+  print "$decl);\n";
+  print "$bench_func);\n";
+  print "$struct } in[] = {";
+
+  open INPUTS, "<$func-inputs" or die $!;
+
+  while (<INPUTS>) {
+    chomp;
+    print "{$_},\n";
+  }
+  print "};\n";
+  print "#define NUM_SAMPLES (sizeof (in) / sizeof (struct args))\n"
+}
+
+print "#define ITER $iters\n";
+print "#define FUNCNAME \"$func\"\n";
+print "#include \"bench-skeleton.c\"\n";


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