gallery3/system/core/Benchmark.php
2009-11-24 19:20:36 -08:00

129 lines
2.9 KiB
PHP

<?php defined('SYSPATH') OR die('No direct access allowed.');
/**
* Simple benchmarking.
*
* $Id: Benchmark.php 4679 2009-11-10 01:45:52Z isaiah $
*
* @package Core
* @author Kohana Team
* @copyright (c) 2007-2009 Kohana Team
* @license http://kohanaphp.com/license
*/
final class Benchmark {
// Benchmark timestamps
private static $marks;
/**
* Set a benchmark start point.
*
* @param string benchmark name
* @return void
*/
public static function start($name)
{
if (isset(self::$marks[$name]) AND self::$marks[$name][0]['stop'] === FALSE)
throw new Kohana_Exception('A benchmark named :name is already running.', array(':name' => $name));
if ( ! isset(self::$marks[$name]))
{
self::$marks[$name] = array();
}
$mark = array
(
'start' => microtime(TRUE),
'stop' => FALSE,
'memory_start' => self::memory_usage(),
'memory_stop' => FALSE
);
array_unshift(self::$marks[$name], $mark);
}
/**
* Set a benchmark stop point.
*
* @param string benchmark name
* @return void
*/
public static function stop($name)
{
if (isset(self::$marks[$name]) AND self::$marks[$name][0]['stop'] === FALSE)
{
self::$marks[$name][0]['stop'] = microtime(TRUE);
self::$marks[$name][0]['memory_stop'] = self::memory_usage();
}
}
/**
* Get the elapsed time between a start and stop.
*
* @param string benchmark name, TRUE for all
* @param integer number of decimal places to count to
* @return array
*/
public static function get($name, $decimals = 4)
{
if ($name === TRUE)
{
$times = array();
$names = array_keys(self::$marks);
foreach ($names as $name)
{
// Get each mark recursively
$times[$name] = self::get($name, $decimals);
}
// Return the array
return $times;
}
if ( ! isset(self::$marks[$name]))
return FALSE;
if (self::$marks[$name][0]['stop'] === FALSE)
{
// Stop the benchmark to prevent mis-matched results
self::stop($name);
}
// Return a string version of the time between the start and stop points
// Properly reading a float requires using number_format or sprintf
$time = $memory = 0;
for ($i = 0; $i < count(self::$marks[$name]); $i++)
{
$time += self::$marks[$name][$i]['stop'] - self::$marks[$name][$i]['start'];
$memory += self::$marks[$name][$i]['memory_stop'] - self::$marks[$name][$i]['memory_start'];
}
return array
(
'time' => number_format($time, $decimals),
'memory' => $memory,
'count' => count(self::$marks[$name])
);
}
/**
* Returns the current memory usage. This is only possible if the
* memory_get_usage function is supported in PHP.
*
* @return integer
*/
private static function memory_usage()
{
static $func;
if ($func === NULL)
{
// Test if memory usage can be seen
$func = function_exists('memory_get_usage');
}
return $func ? memory_get_usage() : 0;
}
} // End Benchmark