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<?php |
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/** |
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* CakePHP(tm) : Rapid Development Framework (http://cakephp.org) |
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* Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org) |
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* |
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* Licensed under The MIT License |
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* Redistributions of files must retain the above copyright notice. |
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* |
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* @copyright Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org) |
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* @link http://cakephp.org CakePHP(tm) Project |
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* @since DebugKit 1.0 |
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* @license http://www.opensource.org/licenses/mit-license.php MIT License |
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*/ |
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namespace DebugKit\Shell; |
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use Cake\Console\Shell; |
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use Cake\Utility\Text; |
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/** |
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* Benchmark Shell Class |
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* |
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* Provides basic benchmarking of application requests |
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* functionally similar to Apache AB |
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* |
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* @since DebugKit 1.0 |
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* @todo Print/export time detail information |
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* @todo Export/graphing of data to .dot format for graphviz visualization |
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* @todo Make calculated results round to leading significant digit position of std dev. |
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*/ |
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class BenchmarkShell extends Shell |
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{ |
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/** |
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* Main execution of shell |
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* |
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* @return void |
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*/ |
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public function main() |
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{ |
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$url = $this->args[0]; |
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$defaults = ['t' => 100, 'n' => 10]; |
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$options = array_merge($defaults, $this->params); |
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$times = []; |
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$this->out(Text::insert(__d('debug_kit', '-> Testing :url'), compact('url'))); |
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$this->out(""); |
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for ($i = 0; $i < $options['n']; $i++) { |
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if (floor($options['t'] - array_sum($times)) <= 0 || $options['n'] <= 1) { |
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break; |
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} |
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$start = microtime(true); |
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file_get_contents($url); |
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$stop = microtime(true); |
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$times[] = $stop - $start; |
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} |
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$this->_results($times); |
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} |
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/** |
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* Prints calculated results |
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* |
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* @param array $times Array of time values |
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* @return void |
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*/ |
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protected function _results($times) |
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{ |
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$duration = array_sum($times); |
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$requests = count($times); |
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$this->out(Text::insert(__d('debug_kit', 'Total Requests made: :requests'), compact('requests'))); |
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$this->out(Text::insert(__d('debug_kit', 'Total Time elapsed: :duration (seconds)'), compact('duration'))); |
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$this->out(""); |
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$this->out(Text::insert(__d('debug_kit', 'Requests/Second: :rps req/sec'), [ |
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'rps' => round($requests / $duration, 3) |
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])); |
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$this->out(Text::insert(__d('debug_kit', 'Average request time: :average-time seconds'), [ |
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'average-time' => round($duration / $requests, 3) |
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])); |
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$this->out(Text::insert(__d('debug_kit', 'Standard deviation of average request time: :std-dev'), [ |
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'std-dev' => round($this->_deviation($times, true), 3) |
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])); |
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$this->out(Text::insert(__d('debug_kit', 'Longest/shortest request: :longest sec/:shortest sec'), [ |
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'longest' => round(max($times), 3), |
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'shortest' => round(min($times), 3) |
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])); |
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$this->out(""); |
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} |
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/** |
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* One-pass, numerically stable calculation of population variance. |
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* |
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* Donald E. Knuth (1998). |
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* The Art of Computer Programming, volume 2: Seminumerical Algorithms, 3rd edn., |
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* p. 232. Boston: Addison-Wesley. |
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* |
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* @param array $times Array of values |
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* @param bool $sample If true, calculates an unbiased estimate of the population |
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* variance from a finite sample. |
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* @return float Variance |
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*/ |
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protected function _variance($times, $sample = true) |
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{ |
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$n = $mean = $M2 = 0; |
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foreach ($times as $time) { |
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$n += 1; |
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$delta = $time - $mean; |
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$mean = $mean + $delta / $n; |
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$M2 = $M2 + $delta * ($time - $mean); |
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} |
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if ($sample) { |
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$n -= 1; |
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} |
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return $M2 / $n; |
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} |
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/** |
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* Calculate the standard deviation. |
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* |
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* @param array $times Array of values |
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* @param bool $sample '' |
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* @return float Standard deviation |
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*/ |
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protected function _deviation($times, $sample = true) |
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{ |
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return sqrt($this->_variance($times, $sample)); |
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} |
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/** |
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* Get option parser. |
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* |
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* @return \Cake\Console\OptionParser |
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*/ |
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public function getOptionParser() |
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{ |
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$parser = parent::getOptionParser(); |
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$parser->description(__d( |
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'debug_kit', |
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'Allows you to obtain some rough benchmarking statistics' . |
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'about a fully qualified URL.' |
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)) |
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->addArgument('url', [ |
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'help' => __d('debug_kit', 'The URL to request.'), |
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'required' => true |
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]) |
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->addOption('n', [ |
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'default' => 10, |
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'help' => __d('debug_kit', 'Number of iterations to perform.') |
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]) |
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->addOption('t', [ |
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'default' => 100, |
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'help' => __d( |
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'debug_kit', |
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'Maximum total time for all iterations, in seconds.' . |
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'If a single iteration takes more than the timeout, only one request will be made' |
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) |
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]) |
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->epilog(__d( |
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'debug_kit', |
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'Example Use: `cake benchmark --n 10 --t 100 http://localhost/testsite`. ' . |
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'<info>Note:</info> this benchmark does not include browser render times.' |
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)); |
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return $parser; |
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} |
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} |
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phpmyadmin /
error-reporting-server
