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Multiple daemon improvements (foreground, faster spawning)

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This commit is contained in:
Michael 2018-06-15 18:18:20 +00:00
commit e97a3c25e7
2 changed files with 67 additions and 46 deletions
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73
bin/daemon.php
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@ -52,6 +52,8 @@ if (in_array("status", $_SERVER["argv"])) {
$mode = "status";
}
$foreground = in_array("--foreground", $_SERVER["argv"]);
if (!isset($mode)) {
die("Please use either 'start', 'stop' or 'status'.\n");
}
@ -94,31 +96,38 @@ if (!empty($pid) && posix_kill($pid, 0)) {
}
logger('Starting worker daemon.', LOGGER_DEBUG);
echo "Starting worker daemon.\n";
// Switch over to daemon mode.
if ($pid = pcntl_fork()) {
return; // Parent
if (!$foreground) {
echo "Starting worker daemon.\n";
// Switch over to daemon mode.
if ($pid = pcntl_fork()) {
return; // Parent
}
fclose(STDIN); // Close all of the standard
fclose(STDOUT); // file descriptors as we
fclose(STDERR); // are running as a daemon.
dba::disconnect();
register_shutdown_function('shutdown');
if (posix_setsid() < 0) {
return;
}
if ($pid = pcntl_fork()) {
return; // Parent
}
$pid = getmypid();
file_put_contents($pidfile, $pid);
// We lose the database connection upon forking
dba::connect($db_host, $db_user, $db_pass, $db_data);
}
fclose(STDIN); // Close all of the standard
fclose(STDOUT); // file descriptors as we
fclose(STDERR); // are running as a daemon.
dba::disconnect();
register_shutdown_function('shutdown');
if (posix_setsid() < 0) {
return;
}
if ($pid = pcntl_fork()) {
return; // Parent
}
// We lose the database connection upon forking
dba::connect($db_host, $db_user, $db_pass, $db_data);
unset($db_host, $db_user, $db_pass, $db_data);
Config::set('system', 'worker_daemon_mode', true);
@ -126,9 +135,6 @@ Config::set('system', 'worker_daemon_mode', true);
// Just to be sure that this script really runs endlessly
set_time_limit(0);
$pid = getmypid();
file_put_contents($pidfile, $pid);
$wait_interval = intval(Config::get('system', 'cron_interval', 5)) * 60;
$do_cron = true;
@ -152,12 +158,21 @@ while (true) {
}
logger("Sleeping", LOGGER_DEBUG);
$i = 0;
$start = time();
do {
sleep(1);
} while (($i++ < $wait_interval) && !Worker::IPCJobsExists());
$seconds = (time() - $start);
if ($i >= $wait_interval) {
// logarithmic wait time calculation.
// Background: After jobs had been started, they often fork many workers.
// To not waste too much time, the sleep period increases.
$arg = (($seconds + 1) / ($wait_interval / 9)) + 1;
$sleep = round(log10($arg) * 1000000, 0);
usleep($sleep);
$timeout = ($seconds >= $wait_interval);
} while (!$timeout && !Worker::IPCJobsExists());
if ($timeout) {
$do_cron = true;
logger("Woke up after $wait_interval seconds.", LOGGER_DEBUG);
} else {