17817 Performance Test - Benchmarks the patch submitted at http://core.trac.wordpress.org/ticket/17817

test_17817.php

<?php

require_once( dirname( __FILE__ ) . '/test_17817_shared.php' );

if ( isset($_SERVER['HTTP_HOST']) ) { echo "<pre>"; }
printf( "Running %d times with %d callbacks\n", TICKET_17817_LOOP_COUNT, TICKET_17817_CALLBACK_COUNT );

$old_path = dirname( __FILE__ ) . '/test_17817_old.php';
$new_path = dirname( __FILE__ ) . '/test_17817_new.php';
$old_results = unserialize( shell_exec( sprintf( 'php "%s"', $old_path ) ) );
$new_results = unserialize( shell_exec( sprintf( 'php "%s"', $new_path ) ) );



printf( "Total Time (Old): %02f\n", $old_results['total'] );
printf( "Average Time (Old): %02f\n", $old_results['average'] );
printf( "Peak Memory after Old: %d\n", $old_results['memory'] );

echo "\n";
printf( "Total Time (New): %02f\n", $new_results['total'] );
printf( "Average Time (New): %02f\n", $new_results['average'] );
printf( "Peak Memory after New: %d\n", $new_results['memory'] );


echo "\n";
printf( "New runs in %02.2f%% of the time of old.\n", ( $new_results['total'] / $old_results['total'] ) * 100 );
printf( "New runs in %02.2f%% of the memory of old.\n", ( $new_results['memory'] / $old_results['memory'] ) * 100 );



die();

test_17817_new.php

<?php

require_once( dirname( __FILE__ ) . '/test_17817_shared.php' );

require_once( ABSPATH . '/wp-includes/class-wp-hook.php' );

function do_action($tag, $arg = '') {
	global $wp_filter, $wp_actions, $wp_current_filter;

	if ( ! isset($wp_actions[$tag]) )
		$wp_actions[$tag] = 1;
	else
		++$wp_actions[$tag];

	// Do 'all' actions first
	if ( isset($wp_filter['all']) ) {
		$wp_current_filter[] = $tag;
		$all_args = func_get_args();
		_wp_call_all_hook($all_args);
	}

	if ( !isset($wp_filter[$tag]) ) {
		if ( isset($wp_filter['all']) )
			array_pop($wp_current_filter);
		return;
	}

	if ( !isset($wp_filter['all']) )
		$wp_current_filter[] = $tag;

	$args = array();
	if ( is_array($arg) && 1 == count($arg) && isset($arg[0]) && is_object($arg[0]) ) // array(&$this)
		$args[] =& $arg[0];
	else
		$args[] = $arg;
	for ( $a = 2; $a < func_num_args(); $a++ )
		$args[] = func_get_arg($a);

	$wp_filter[$tag]->do_action( $args );

	array_pop($wp_current_filter);
}

function add_filter( $tag, $function_to_add, $priority = 10, $accepted_args = 1 ) {
	global $wp_filter;
	if ( !isset($wp_filter[$tag]) ) {
		$wp_filter[$tag] = new WP_Hook();
	}
	$wp_filter[$tag]->add_filter( $function_to_add, $priority, $accepted_args, $tag );

	return true;
}

echo serialize( ticket_17817_run_loop() );
exit();

test_17817_old.php

<?php

require_once( dirname( __FILE__ ) . '/test_17817_shared.php' );

function do_action($tag, $arg = '') {
	global $wp_filter, $wp_actions, $merged_filters, $wp_current_filter;

	if ( ! isset($wp_actions[$tag]) )
		$wp_actions[$tag] = 1;
	else
		++$wp_actions[$tag];

	// Do 'all' actions first
	if ( isset($wp_filter['all']) ) {
		$wp_current_filter[] = $tag;
		$all_args = func_get_args();
		_wp_call_all_hook($all_args);
	}

	if ( !isset($wp_filter[$tag]) ) {
		if ( isset($wp_filter['all']) )
			array_pop($wp_current_filter);
		return;
	}

	if ( !isset($wp_filter['all']) )
		$wp_current_filter[] = $tag;

	$args = array();
	if ( is_array($arg) && 1 == count($arg) && isset($arg[0]) && is_object($arg[0]) ) // array(&$this)
		$args[] =& $arg[0];
	else
		$args[] = $arg;
	for ( $a = 2; $a < func_num_args(); $a++ )
		$args[] = func_get_arg($a);

	// Sort
	if ( !isset( $merged_filters[ $tag ] ) ) {
		ksort($wp_filter[$tag]);
		$merged_filters[ $tag ] = true;
	}

	reset( $wp_filter[ $tag ] );

	do {
		foreach ( (array) current($wp_filter[$tag]) as $the_ )
			if ( !is_null($the_['function']) )
				call_user_func_array($the_['function'], array_slice($args, 0, (int) $the_['accepted_args']));

	} while ( next($wp_filter[$tag]) !== false );

	array_pop($wp_current_filter);
}

function add_filter( $tag, $function_to_add, $priority = 10, $accepted_args = 1 ) {
	global $wp_filter, $merged_filters;

	$idx = _wp_filter_build_unique_id($tag, $function_to_add, $priority);
	$wp_filter[$tag][$priority][$idx] = array('function' => $function_to_add, 'accepted_args' => $accepted_args);
	unset( $merged_filters[ $tag ] );
	return true;
}

echo serialize( ticket_17817_run_loop() );
exit();

test_17817_shared.php

<?php


define('ABSPATH', dirname(dirname(__FILE__)).'/src');
define('TEST_ACTION_NAME', '17817');
define('TICKET_17817_LOOP_COUNT', 1000);
define('TICKET_17817_CALLBACK_COUNT', 1000);

function ticket_17817_callback(){}

function ticket_17817_run_once() {
	global $wp_filter;
	if ( !isset($wp_filter) ) {
		$wp_filter = array();
	} elseif ( isset($wp_filter[TEST_ACTION_NAME]) && $wp_filter[TEST_ACTION_NAME] instanceof WP_Hook ) {
		$wp_filter[TEST_ACTION_NAME]->remove_all_filters(TEST_ACTION_NAME);
	} else {
		$wp_filter = array();
	}
	for ( $i = 0 ; $i < TICKET_17817_CALLBACK_COUNT ; $i++ ) {
		add_filter( TEST_ACTION_NAME, 'ticket_17817_callback', rand(1,1000), 1000 );
	}
	$args = array( TEST_ACTION_NAME );
	//for ( $i = 0 ; $i < 100 ; $i++ ) { // for testing with additional callback args
	//	$args[] = $i;
	//}
	$start = microtime(TRUE);
	call_user_func_array( 'do_action', $args );
	$end = microtime(TRUE);
	return $end - $start;
}

function ticket_17817_run_loop() {
	$times = array();
	for ( $i = 0 ; $i < TICKET_17817_LOOP_COUNT ; $i++ ) {
		$times[] = ticket_17817_run_once();
	}

	return array(
		'memory' => memory_get_peak_usage(),
		'total' => array_sum( $times ),
		'average' => ( array_sum( $times ) / TICKET_17817_LOOP_COUNT ),
	);
}

function _wp_filter_build_unique_id($tag, $function, $priority) {
	global $wp_filter;
	static $filter_id_count = 0;

	if ( is_string($function) )
		return $function;

	if ( is_object($function) ) {
		// Closures are currently implemented as objects
		$function = array( $function, '' );
	} else {
		$function = (array) $function;
	}

	if (is_object($function[0]) ) {
		// Object Class Calling
		if ( function_exists('spl_object_hash') ) {
			return spl_object_hash($function[0]) . $function[1];
		} else {
			$obj_idx = get_class($function[0]).$function[1];
			if ( !isset($function[0]->wp_filter_id) ) {
				if ( false === $priority )
					return false;
				$obj_idx .= isset($wp_filter[$tag][$priority]) ? count((array)$wp_filter[$tag][$priority]) : $filter_id_count;
				$function[0]->wp_filter_id = $filter_id_count;
				++$filter_id_count;
			} else {
				$obj_idx .= $function[0]->wp_filter_id;
			}

			return $obj_idx;
		}
	} else if ( is_string($function[0]) ) {
		// Static Calling
		return $function[0] . '::' . $function[1];
	}
}