#!/usr/bin/perl -w
# Copyright (C) 2019 all contributors
# License: AGPL-3.0+
#
# Parallel test runner which preloads code and reuses worker processes
# to give a nice speedup over prove(1). It also generates per-test
# .log files (similar to automake tests).
#
# *.t files run by this should not rely on global state.
#
# Usage: $PERL -I lib -w t/run.perl -j4
# Or via prove(1): prove -lvw t/run.perl :: -j4
use strict;
use PublicInbox::TestCommon;
use Cwd qw(getcwd);
use Getopt::Long qw(:config gnu_getopt no_ignore_case auto_abbrev);
use Errno qw(EINTR);
use POSIX qw(_POSIX_PIPE_BUF WNOHANG);
my $jobs = 1;
my $repeat = 1;
$| = 1;
our $log_suffix = '.log';
my ($shuffle, %pids, @err);
GetOptions('j|jobs=i' => \$jobs,
'repeat=i' => \$repeat,
'log=s' => \$log_suffix,
's|shuffle' => \$shuffle,
) or die "Usage: $0 [-j JOBS] [--log=SUFFIX] [--repeat RUNS]";
if (($ENV{TEST_RUN_MODE} // 1) == 0) {
die "$0 is not compatible with TEST_RUN_MODE=0\n";
}
my @tests = scalar(@ARGV) ? @ARGV : glob('t/*.t');
my $cwd = getcwd();
open OLDOUT, '>&STDOUT' or die "dup STDOUT: $!";
open OLDERR, '>&STDERR' or die "dup STDERR: $!";
OLDOUT->autoflush(1);
OLDERR->autoflush(1);
key2sub($_) for @tests; # precache
if ($shuffle) {
require List::Util;
} elsif (open(my $prove_state, '<', '.prove') && eval { require YAML::XS }) {
# reuse "prove --state=save" data to start slowest tests, first
my $state = YAML::XS::Load(do { local $/; <$prove_state> });
my $t = $state->{tests};
@tests = sort {
($t->{$b}->{elapsed} // 0) <=> ($t->{$a}->{elapsed} // 0)
} @tests;
}
our $tb = Test::More->builder;
sub DIE (;$) {
print OLDERR @_;
exit(1);
}
our ($worker, $worker_test);
sub test_status () {
$? = 255 if $? == 0 && !$tb->is_passing;
my $status = $? ? 'not ok' : 'ok';
print OLDOUT "$status $worker_test\n" if $log_suffix ne '';
}
# Test::Builder or Test2::Hub may call exit() from plan(skip_all => ...)
END { test_status() if (defined($worker_test) && $worker == $$) }
sub run_test ($) {
my ($test) = @_;
my $log_fh;
if ($log_suffix ne '') {
my $log = $test;
$log =~ s/\.[^\.]+\z/$log_suffix/ or DIE "can't log for $test";
open $log_fh, '>', $log or DIE "open $log: $!";
$log_fh->autoflush(1);
$tb->output($log_fh);
$tb->failure_output($log_fh);
$tb->todo_output($log_fh);
open STDOUT, '>&', $log_fh or DIE "1>$log: $!";
open STDERR, '>&', $log_fh or DIE "2>$log: $!";
}
$worker_test = $test;
run_script([$test]);
test_status();
$worker_test = undef;
push @err, "$test ($?)" if $?;
}
sub UINT_SIZE () { 4 }
# worker processes will SIGUSR1 the producer process when it
# sees EOF on the pipe. On FreeBSD 11.2 and Perl 5.30.0,
# sys/ioctl.ph gives the wrong value for FIONREAD().
my $producer = $$;
my $eof; # we stop respawning if true
my $start_worker = sub {
my ($i, $j, $rd, $todo) = @_;
defined(my $pid = fork) or DIE "fork: $!";
if ($pid == 0) {
$worker = $$;
while (1) {
my $r = sysread($rd, my $buf, UINT_SIZE);
if (!defined($r)) {
next if $! == EINTR;
DIE "sysread: $!";
}
last if $r == 0;
DIE "short read $r" if $r != UINT_SIZE;
my $t = unpack('I', $buf);
run_test($todo->[$t]);
$tb->reset;
chdir($cwd) or DIE "chdir: $!";
}
kill 'USR1', $producer if !$eof; # sets $eof in $producer
DIE join('', map { "E: $_\n" } @err) if @err;
exit(0);
} else {
$pids{$pid} = $j;
}
};
# negative $repeat means loop forever:
for (my $i = $repeat; $i != 0; $i--) {
my @todo = $shuffle ? List::Util::shuffle(@tests) : @tests;
# single-producer, multi-consumer queue relying on POSIX semantics
pipe(my ($rd, $wr)) or DIE "pipe: $!";
# fill the queue before forking so children can start earlier
my $n = (_POSIX_PIPE_BUF / UINT_SIZE);
if ($n >= $#todo) {
print $wr join('', map { pack('I', $_) } (0..$#todo)) or DIE;
close $wr or die;
$wr = undef;
} else { # write what we can...
$wr->autoflush(1);
print $wr join('', map { pack('I', $_) } (0..$n)) or DIE;
$n += 1; # and send more ($n..$#todo), later
}
$eof = undef;
local $SIG{USR1} = sub { $eof = 1 };
my $sigchld = sub {
my ($sig) = @_;
my $flags = $sig ? WNOHANG : 0;
while (1) {
my $pid = waitpid(-1, $flags) or return;
return if $pid < 0;
my $j = delete $pids{$pid};
if (!defined($j)) {
push @err, "reaped unknown $pid ($?)";
next;
}
push @err, "job[$j] ($?)" if $?;
# skip_all can exit(0), respawn if needed:
if (!$eof) {
print OLDERR "# respawning job[$j]\n";
$start_worker->($i, $j, $rd, \@todo);
}
}
};
# start the workers to consume the queue
for (my $j = 0; $j < $jobs; $j++) {
$start_worker->($i, $j, $rd, \@todo);
}
if ($wr) {
local $SIG{CHLD} = $sigchld;
# too many tests to fit in the pipe before starting workers,
# send the rest now the workers are running
print $wr join('', map { pack('I', $_) } ($n..$#todo)) or DIE;
close $wr or die;
}
$sigchld->(0) while scalar(keys(%pids));
DIE join('', map { "E: $_\n" } @err) if @err;
}
print OLDOUT "1..".($repeat * scalar(@tests))."\n" if $repeat >= 0;