#! /usr/bin/perl
##--------------------------------------------------------------------##
##--- Valgrind performance testing script vg_perf ---##
##--------------------------------------------------------------------##
# This file is part of Valgrind, a dynamic binary instrumentation
# framework.
#
# Copyright (C) 2005-2017 Nicholas Nethercote
# njn@valgrind.org
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of the
# License, or (at your option) any later version.
#
# This program 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
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
# 02111-1307, USA.
#
# The GNU General Public License is contained in the file COPYING.
#----------------------------------------------------------------------------
# usage: see usage message.
#
# You can specify individual files to test, or whole directories, or both.
# Directories are traversed recursively, except for ones named, for example,
# CVS/ or docs/.
#
# Each test is defined in a file <test>.vgperf, containing one or more of the
# following lines, in any order:
# - prog: <prog to run> (compulsory)
# - args: <args for prog> (default: none)
# - vgopts: <Valgrind options> (default: none)
# - prereq: <prerequisite command> (default: none)
# - cleanup: <post-test cleanup cmd to run> (default: none)
#
# The prerequisite command, if present, must return 0 otherwise the test is
# skipped.
# Sometimes it is useful to run all the tests at a high sanity check
# level or with arbitrary other flags. To make this simple, extra
# options, applied to all tests run, are read from $EXTRA_REGTEST_OPTS,
# and handed to valgrind prior to any other flags specified by the
# .vgperf file. Note: the env var is the same as vg_regtest.
#----------------------------------------------------------------------------
use warnings;
use strict;
#----------------------------------------------------------------------------
# Global vars
#----------------------------------------------------------------------------
my $usage = <<END
usage: vg_perf [options] [files or dirs]
options for the user, with defaults in [ ], are:
-h --help show this message
--reps=<n> number of repeats for each program [1]
--tools=<t1,t2,t3> tools to run [Nulgrind and Memcheck]
--vg=<dir> top-level directory containing Valgrind to measure
[Valgrind in the current directory, i.e. --vg=.]
Can be specified multiple times.
The "in-place" build is used.
--outer-valgrind: run these Valgrind(s) under the given outer valgrind.
These Valgrind(s) must be configured with --enable-inner.
--outer-tool: tool to use by the outer valgrind (default cachegrind).
--outer-args: use this as outer tool args. If the outer args are starting
with +, the given outer args are appended to the outer args predefined
by vg_perf.
Any tools named in --tools must be present in all directories specified
with --vg. (This is not checked.)
Use EXTRA_REGTEST_OPTS to supply extra args for all tests
END
;
# Test variables
my $vgopts; # valgrind options
my $prog; # test prog
my $args; # test prog args
my $prereq; # prerequisite test to satisfy before running test
my $cleanup; # cleanup command to run
# Command line options
my $n_reps = 1; # Run each test $n_reps times and choose the best one.
my @vgdirs; # Dirs of the various Valgrinds being measured.
my @tools = ("none", "memcheck"); # tools being measured
# Outer valgrind to use, and args to use for it.
# If this is set, --valgrind should be set to the installed inner valgrind,
# and --valgrind-lib will be ignore
my $outer_valgrind;
my $outer_tool = "cachegrind";
my $outer_args;
my $num_tests_done = 0;
my $num_timings_done = 0;
# Starting directory
chomp(my $tests_dir = `pwd`);
#----------------------------------------------------------------------------
# Process command line, setup
#----------------------------------------------------------------------------
# If $prog is a relative path, it prepends $dir to it. Useful for two reasons:
#
# 1. Can prepend "." onto programs to avoid trouble with users who don't have
# "." in their path (by making $dir = ".")
# 2. Can prepend the current dir to make the command absolute to avoid
# subsequent trouble when we change directories.
#
# Also checks the program exists and is executable.
sub validate_program ($$$$)
{
my ($dir, $prog, $must_exist, $must_be_executable) = @_;
# If absolute path, leave it alone. If relative, make it
# absolute -- by prepending current dir -- so we can change
# dirs and still use it.
$prog = "$dir/$prog" if ($prog !~ /^\//);
if ($must_exist) {
(-f $prog) or die "vg_perf: '$prog' not found or not a file ($dir)\n";
}
if ($must_be_executable) {
(-x $prog) or die "vg_perf: '$prog' not executable ($dir)\n";
}
return $prog;
}
sub add_vgdir($)
{
my ($vgdir) = @_;
if ($vgdir !~ /^\//) { $vgdir = "$tests_dir/$vgdir"; }
push(@vgdirs, $vgdir);
}
sub process_command_line()
{
my @fs;
for my $arg (@ARGV) {
if ($arg =~ /^-/) {
if ($arg =~ /^--reps=(\d+)$/) {
$n_reps = $1;
if ($n_reps < 1) { die "bad --reps value: $n_reps\n"; }
} elsif ($arg =~ /^--vg=(.+)$/) {
# Make dir absolute if not already
add_vgdir($1);
} elsif ($arg =~ /^--tools=(.+)$/) {
@tools = split(/,/, $1);
} elsif ($arg =~ /^--outer-valgrind=(.*)$/) {
$outer_valgrind = $1;
} elsif ($arg =~ /^--outer-tool=(.*)$/) {
$outer_tool = $1;
} elsif ($arg =~ /^--outer-args=(.*)$/) {
$outer_args = $1;
} else {
die $usage;
}
} else {
push(@fs, $arg);
}
}
# If no --vg options were specified, use the current tree.
if (0 == @vgdirs) {
add_vgdir($tests_dir);
}
(0 != @fs) or die "No test files or directories specified\n";
return @fs;
}
#----------------------------------------------------------------------------
# Read a .vgperf file
#----------------------------------------------------------------------------
sub read_vgperf_file($)
{
my ($f) = @_;
# Defaults.
($vgopts, $prog, $args, $prereq, $cleanup)
= ("", undef, "", undef, undef, undef, undef);
open(INPUTFILE, "< $f") || die "File $f not openable\n";
while (my $line = <INPUTFILE>) {
if ($line =~ /^\s*#/ || $line =~ /^\s*$/) {
next;
} elsif ($line =~ /^\s*vgopts:\s*(.*)$/) {
$vgopts = $1;
} elsif ($line =~ /^\s*prog:\s*(.*)$/) {
$prog = validate_program(".", $1, 1, 1);
} elsif ($line =~ /^\s*args:\s*(.*)$/) {
$args = $1;
} elsif ($line =~ /^\s*prereq:\s*(.*)$/) {
$prereq = $1;
} elsif ($line =~ /^\s*cleanup:\s*(.*)$/) {
$cleanup = $1;
} else {
die "Bad line in $f: $line\n";
}
}
close(INPUTFILE);
if (!defined $prog) {
$prog = ""; # allow no prog for testing error and --help cases
}
if (0 == @tools) {
die "vg_perf: missing 'tools' line in $f\n";
}
}
#----------------------------------------------------------------------------
# Do one test
#----------------------------------------------------------------------------
# Since most of the program time is spent in system() calls, need this to
# propagate a Ctrl-C enabling us to quit.
sub mysystem($)
{
my ($cmd) = @_;
my $retval = system($cmd);
if ($retval == 2) {
exit 1;
} else {
return $retval;
}
}
# Run program N times, return the best user time. Use the POSIX
# -p flag on /usr/bin/time so as to get something parseable on AIX.
sub time_prog($$)
{
my ($cmd, $n) = @_;
my $tmin = 999999;
for (my $i = 0; $i < $n; $i++) {
mysystem("echo '$cmd' > perf.cmd");
my $retval = mysystem("$cmd > perf.stdout 2> perf.stderr");
(0 == $retval) or
die "\n*** Command returned non-zero ($retval)"
. "\n*** See perf.{cmd,stdout,stderr} to determine what went wrong.\n";
my $out = `cat perf.stderr`;
($out =~ /[Uu]ser +([\d\.]+)/) or
die "\n*** missing usertime in perf.stderr\n";
$tmin = $1 if ($1 < $tmin);
}
# Successful run; cleanup
unlink("perf.cmd");
unlink("perf.stderr");
unlink("perf.stdout");
# Avoid divisions by zero!
return (0 == $tmin ? 0.01 : $tmin);
}
sub do_one_test($$)
{
my ($dir, $vgperf) = @_;
$vgperf =~ /^(.*)\.vgperf/;
my $name = $1;
my %first_tTool; # For doing percentage speedups when comparing
# multiple Valgrinds
read_vgperf_file($vgperf);
if (defined $prereq) {
if (system("$prereq") != 0) {
printf("%-16s (skipping, prereq failed: $prereq)\n", "$name:");
return;
}
}
my $timecmd = "/usr/bin/time -p";
# Do the native run(s).
printf("-- $name --\n") if (@vgdirs > 1);
my $cmd = "$timecmd $prog $args";
my $tNative = time_prog($cmd, $n_reps);
if (defined $outer_valgrind) {
$outer_valgrind = validate_program($tests_dir, $outer_valgrind, 1, 1);
foreach my $vgdir (@vgdirs) {
validate_program($vgdir, "./coregrind/valgrind", 1, 1);
}
} else {
foreach my $vgdir (@vgdirs) {
validate_program($vgdir, "./coregrind/valgrind", 1, 1);
}
}
# Pull any extra options (for example, --sanity-level=4)
# from $EXTRA_REGTEST_OPTS.
my $maybe_extraopts = $ENV{"EXTRA_REGTEST_OPTS"};
my $extraopts = $maybe_extraopts ? $maybe_extraopts : "";
foreach my $vgdir (@vgdirs) {
# Benchmark name
printf("%-8s ", $name);
# Print the Valgrind version if we are measuring more than one.
my $vgdirname = $vgdir;
chomp($vgdirname = `basename $vgdir`);
printf("%-10s:", $vgdirname);
# Native execution time
printf("%4.2fs", $tNative);
foreach my $tool (@tools) {
# First two chars of toolname for abbreviation
my $tool_abbrev = $tool;
$tool_abbrev =~ s/(..).*/$1/;
printf(" %s:", $tool_abbrev);
my $run_outer_args = "";
if ((not defined $outer_args) || ($outer_args =~ /^\+/)) {
$run_outer_args =
" -v --command-line-only=yes"
. " --run-libc-freeres=no --sim-hints=enable-outer"
. " --smc-check=all-non-file"
. " --vgdb=no --trace-children=yes --read-var-info=no"
. " --suppressions=../tests/outer_inner.supp"
. " --memcheck:leak-check=full --memcheck:show-reachable=no"
. " --cachegrind:cache-sim=yes --cachegrind:branch-sim=yes"
. " --cachegrind:cachegrind-out-file=cachegrind.out.$vgdirname.$tool_abbrev.$name.%p"
. " --callgrind:cache-sim=yes --callgrind:branch-sim=yes"
. " --callgrind:dump-instr=yes --callgrind:collect-jumps=yes"
. " --callgrind:callgrind-out-file=callgrind.out.$vgdirname.$tool_abbrev.$name.%p"
. " ";
if (defined $outer_args) {
$outer_args =~ s/^\+(.*)/$1/;
$run_outer_args = $run_outer_args . $outer_args;
}
} else {
$run_outer_args = $outer_args;
}
my $vgsetup = "";
my $vgcmd = "$vgdir/coregrind/valgrind "
. "--command-line-only=yes --tool=$tool $extraopts -q "
. "--memcheck:leak-check=no "
. "--trace-children=yes "
. "$vgopts ";
# Do the tool run(s).
if (defined $outer_valgrind ) {
# in an outer-inner setup, only set VALGRIND_LIB_INNER
$vgsetup = "VALGRIND_LIB_INNER=$vgdir/.in_place ";
$vgcmd = "$outer_valgrind "
. "--tool=" . $outer_tool . " "
. "--log-file=" . "$outer_tool.outer.log.$vgdirname.$tool_abbrev.$name.%p "
. "$run_outer_args "
. $vgcmd;
} else {
# Set both VALGRIND_LIB and VALGRIND_LIB_INNER
# in case this Valgrind was configured with --enable-inner. And
# also VALGRINDLIB, which was the old name for the variable, to
# allow comparison against old Valgrind versions (eg. 2.4.X).
$vgsetup = "VALGRINDLIB=$vgdir/.in_place "
. "VALGRIND_LIB=$vgdir/.in_place "
. "VALGRIND_LIB_INNER=$vgdir/.in_place ";
}
my $cmd = "$vgsetup $timecmd $vgcmd $prog $args";
my $tTool = time_prog($cmd, $n_reps);
printf("%4.1fs (%4.1fx,", $tTool, $tTool/$tNative);
# If it's the first timing for this tool on this benchmark,
# record the time so we can get the percentage speedup of the
# subsequent Valgrinds. Otherwise, compute and print
# the speedup.
if (not defined $first_tTool{$tool}) {
$first_tTool{$tool} = $tTool;
print(" -----)");
} else {
my $speedup = 100 - (100 * $tTool / $first_tTool{$tool});
printf("%5.1f%%)", $speedup);
}
$num_timings_done++;
if (defined $cleanup) {
(system("$cleanup") == 0) or
print(" ($name cleanup operation failed: $cleanup)\n");
}
}
printf("\n");
}
$num_tests_done++;
}
#----------------------------------------------------------------------------
# Test one directory (and any subdirs)
#----------------------------------------------------------------------------
sub test_one_dir($$); # forward declaration
sub test_one_dir($$)
{
my ($dir, $prev_dirs) = @_;
$dir =~ s/\/$//; # trim a trailing '/'
chomp(my $initial_dir = `pwd`); # record where we started
# Ignore dirs into which we should not recurse.
if ($dir =~ /^(BitKeeper|CVS|SCCS|docs|doc)$/) { return; }
chdir($dir) or die "Could not change into $dir\n";
# Nb: Don't prepend a '/' to the base directory
my $full_dir = $prev_dirs . ($prev_dirs eq "" ? "" : "/") . $dir;
my $dashes = "-" x (50 - length $full_dir);
my @fs = glob "*";
my $found_tests = (0 != (grep { $_ =~ /\.vgperf$/ } @fs));
if ($found_tests) {
print "-- Running tests in $full_dir $dashes\n";
}
foreach my $f (@fs) {
if (-d $f) {
test_one_dir($f, $full_dir);
} elsif ($f =~ /\.vgperf$/) {
do_one_test($full_dir, $f);
}
}
if ($found_tests) {
print "-- Finished tests in $full_dir $dashes\n";
}
chdir("$initial_dir");
}
#----------------------------------------------------------------------------
# Summarise results
#----------------------------------------------------------------------------
sub summarise_results
{
printf("\n== %d programs, %d timings =================\n\n",
$num_tests_done, $num_timings_done);
}
#----------------------------------------------------------------------------
# main()
#----------------------------------------------------------------------------
sub warn_about_EXTRA_REGTEST_OPTS()
{
print "WARNING: \$EXTRA_REGTEST_OPTS is set. You probably don't want\n";
print "to run the perf tests with it set, unless you are doing some\n";
print "strange experiment, and/or you really know what you are doing.\n";
print "\n";
}
# nuke VALGRIND_OPTS
$ENV{"VALGRIND_OPTS"} = "";
if ($ENV{"EXTRA_REGTEST_OPTS"}) {
print "\n";
warn_about_EXTRA_REGTEST_OPTS();
}
my @fs = process_command_line();
foreach my $f (@fs) {
if (-d $f) {
test_one_dir($f, "");
} else {
# Allow the .vgperf suffix to be given or omitted
if ($f =~ /.vgperf$/ && -r $f) {
# do nothing
} elsif (-r "$f.vgperf") {
$f = "$f.vgperf";
} else {
die "`$f' neither a directory nor a readable test file/name\n"
}
my $dir = `dirname $f`; chomp $dir;
my $file = `basename $f`; chomp $file;
chdir($dir) or die "Could not change into $dir\n";
do_one_test($dir, $file);
chdir($tests_dir);
}
}
summarise_results();
if ($ENV{"EXTRA_REGTEST_OPTS"}) {
warn_about_EXTRA_REGTEST_OPTS();
}
##--------------------------------------------------------------------##
##--- end ---##
##--------------------------------------------------------------------##