[interp] Remove unreachable code (#12411)

[mono-project.git] / mono / tests / stress-runner.pl

#!/usr/bin/perl -w

# mono stress test tool
# This stress test runner is designed to detect possible
# leaks, runtime slowdowns and crashes when a task is performed
# repeatedly.
# A stress program should be written to repeat for a number of times
# a specific task: it is run a first time to collect info about memory
# and cpu usage: this run should last a couple of seconds or so.
# Then, the same program is run with a number of iterations that is at least
# 2 orders of magnitude bigger than the first run (3 orders should be used,
# eventually, to detect smaller leaks).
# Of course the right time for the test and the ratio depends on the test
# itself, so it's configurable per-test.
# The test driver will then check that the second run has used roughly the
# same amount of memory as the first and a proportionally bigger cpu time.
# Note: with a conservative GC there may be more false positives than
# with a precise one, because heap size may grow depending on timing etc.
# so failing results need to be checked carefully. In some cases a solution
# is to increase the number of runs in the dry run.

use POSIX ":sys_wait_h";
use Time::HiRes qw(usleep ualarm gettimeofday tv_interval);

# in milliseconds between checks of resource usage
my $interval = 50;
# multiplier to allow some wiggle room
my $wiggle_ratio = 1.05;
# if the test computer is too fast or if we want to stress test more,
# we multiply the test ratio by this number. Use the --times=x option.
my $extra_strong = 1;

# descriptions of the tests to run
# for each test:
#       program is the program to run
#       args an array ref of argumenst to pass to program
#       arg-knob is the index of the argument in args that changes the number of iterations
#       ratio is the multiplier applied to the arg-knob argument
my %tests = (
        'domain-stress' => {
                'program' => 'domain-stress.exe',
                # threads, domains, allocs, loops
                'args' => [2, 10, 1000, 1],
                'arg-knob' => 3, # loops
                'ratio' => 30,
        },
        'gchandle-stress' => {
                'program' => 'gchandle-stress.exe',
                # allocs, loops
                'args' => [80000, 2],
                'arg-knob' => 1, # loops
                'ratio' => 20,
        },
        'monitor-stress' => {
                'program' => 'monitor-stress.exe',
                # loops
                'args' => [10],
                'arg-knob' => 0, # loops
                'ratio' => 20,
        },
        'gc-stress' => {
                'program' => 'gc-stress.exe',
                # loops
                'args' => [25],
                'arg-knob' => 0, # loops
                'ratio' => 20,
        },
        'gc-graystack-stress' => {
                'program' => 'gc-graystack-stress.exe',
                # width, depth, collections
                'args' => [125, 10000, 100],
                'arg-knob' => 2, # loops
                'ratio' => 10,
        },
        'gc-copy-stress' => {
                'program' => 'gc-copy-stress.exe',
                # loops, count, persist_factor
                'args' => [250, 500000, 10],
                'arg-knob' => 1, # count
                'ratio' => 4,
        },
        'thread-stress' => {
                'program' => 'thread-stress.exe',
                # loops
                'args' => [20],
                'arg-knob' => 0, # loops
                'ratio' => 20,
        },
        'abort-stress-1' => {
                'program' => 'abort-stress-1.exe',
                # loops,
                'args' => [20],
                'arg-knob' => 0, # loops
                'ratio' => 20,
        },
        # FIXME: This tests exits, so it has no loops, instead it should be run more times
        'exit-stress' => {
                'program' => 'exit-stress.exe',
                # loops,
                'args' => [10],
                'arg-knob' => 0, # loops
                'ratio' => 20,
        }
        # FIXME: This test deadlocks, bug 72740.
        # We need hang detection
        #'abort-stress-2' => {
        #       'program' => 'abort-stress-2.exe',
        #       # loops,
        #       'args' => [20],
        #       'arg-knob' => 0, # loops
        #       'ratio' => 20,
        #}
);

# poor man option handling
while (@ARGV) {
        my $arg = shift @ARGV;
        if ($arg =~ /^--times=(\d+)$/) {
                $extra_strong = $1;
                next;
        }
        if ($arg =~ /^--interval=(\d+)$/) {
                $interval = $1;
                next;
        }
        unshift @ARGV, $arg;
        last;
}
my $test_rx = shift (@ARGV) || '.';
# the mono runtime to use and the arguments to pass to it
my @mono_args = @ARGV;
my @results = ();
my %vmmap = qw(VmSize 0 VmLck 1 VmRSS 2 VmData 3 VmStk 4 VmExe 5 VmLib 6 VmHWM 7 VmPTE 8 VmPeak 9);
my @vmnames = sort {$vmmap{$a} <=> $vmmap{$b}} keys %vmmap;
# VmRSS depends on the operating system's decisions
my %vmignore = qw(VmRSS 1);
my $errorcount = 0;
my $numtests = 0;

@mono_args = 'mono' unless @mono_args;

apply_options ();

foreach my $test (sort keys %tests) {
        next unless ($tests{$test}->{'program'} =~ /$test_rx/);
        $numtests++;
        run_test ($test, 'dry');
        run_test ($test, 'stress');
}

# print all the reports at the end
foreach my $test (sort keys %tests) {
        next unless ($tests{$test}->{'program'} =~ /$test_rx/);
        print_test_report ($test);
}

print "No tests matched '$test_rx'.\n" unless $numtests;

if ($errorcount) {
        print "Total issues: $errorcount\n";
        exit (1);
} else {
        exit (0);
}

sub run_test {
        my ($name, $mode) = @_;
        my $test = $tests {$name};
        my @targs = (@mono_args, $test->{program});
        my @results = ();
        my @rargs = @{$test->{"args"}};

        if ($mode ne "dry") {
                # FIXME: set also a timeout
                $rargs [$test->{"arg-knob"}] *= $test->{"ratio"};
        }
        push @targs, @rargs;
        print "Running test '$name' in $mode mode\n";
        my $start_time = [gettimeofday];
        my $pid = fork ();
        if ($pid == 0) {
                exec @targs;
                die "Cannot exec: $! (@targs)\n";
        } else {
                my $kid;
                do {
                        $kid = waitpid (-1, WNOHANG);
                        my $sample = collect_memusage ($pid);
                        push @results, $sample if (defined ($sample) && @{$sample});
                        # sleep for a few ms
                        usleep ($interval * 1000) unless $kid > 0;
                } until $kid > 0;
        }
        my $end_time = [gettimeofday];
        $test->{"$mode-cputime"} = tv_interval ($start_time, $end_time);
        $test->{"$mode-memusage"} = [summarize_result (@results)];
}

sub print_test_report {
        my ($name) = shift;
        my $test = $tests {$name};
        my ($cpu_dry, $cpu_test) = ($test->{'dry-cputime'}, $test->{'stress-cputime'});
        my @dry_mem = @{$test->{'dry-memusage'}};
        my @test_mem = @{$test->{'stress-memusage'}};
        my $ratio = $test->{'ratio'};
        print "Report for test: $name\n";
        print "Cpu usage: dry: $cpu_dry, stress: $cpu_test\n";
        print "Memory usage (KB):\n";
        print "\t       ",join ("\t", @vmnames), "\n";
        print "\t   dry: ", join ("\t", @dry_mem), "\n";
        print "\tstress: ", join ("\t", @test_mem), "\n";
        if ($cpu_test > ($cpu_dry * $ratio) * $wiggle_ratio) {
                print "Cpu usage not proportional to ratio $ratio.\n";
                $errorcount++;
        }
        my $i;
        for ($i = 0; $i < @dry_mem; ++$i) {
                next if exists $vmignore {$vmnames [$i]};
                if ($test_mem [$i] > $dry_mem [$i] * $wiggle_ratio) {
                        print "Memory usage $vmnames[$i] not constant.\n";
                        $errorcount++;
                }
        }
}

sub collect_memusage {
        my ($pid) = @_;
        open (PROC, "</proc/$pid/status") || return undef; # might be dead already
        my @sample = ();
        while (<PROC>) {
                next unless /^(Vm.*?):\s+(\d+)\s+kB/;
                $sample [$vmmap {$1}] = $2;
        }
        close (PROC);
        return \@sample;
}

sub summarize_result {
        my (@data) = @_;
        my (@result) = (0) x 7;
        my $i;
        foreach my $sample (@data) {
                for ($i = 0; $i < 7; ++$i) {
                        if ($sample->[$i] > $result [$i]) {
                                $result [$i] = $sample->[$i];
                        }
                }
        }
        return @result;
}

sub apply_options {
        foreach my $test (values %tests) {
                $test->{args}->[$test->{'arg-knob'}] *= $extra_strong;
        }
}