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