Modules

Bench_StripNullBytes
extends Codebench
extends Kohana_Codebench

package: Kohana/Codebench
category: Tests
author: Geert De Deckere

Class declared in MODPATH/codebench/classes/bench/stripnullbytes.php on line 7.

Constants

None

Properties

$description
$grades
$loops
$subjects

Methods

bench_preg_replace()
bench_str_replace()
bench_strtr()
__construct()
run()
_grade()
_method_filter()

Propertieslink to this

public $descriptionlink to this
public array $gradeslink to this: Grade letters with their maximum scores. Used to color the graphs.
public $loopslink to this
public $subjectslink to this

Methodslink to this

public bench_preg_replace( ) (defined in Bench_StripNullBytes) link to this

Source Code

?
public function bench_preg_replace($subject)
{
    return preg_replace('~\0+~', '', $subject);
}

public bench_str_replace( ) (defined in Bench_StripNullBytes) link to this

Source Code

?
public function bench_str_replace($subject)
{
    return str_replace("\0", '', $subject);
}

public bench_strtr( ) (defined in Bench_StripNullBytes) link to this

Source Code

?
public function bench_strtr($subject)
{
    return strtr($subject, array("\0" => ''));
}

public __construct( ) (defined in Kohana_Codebench) link to this

Constructor.

Return Values

void

Source Code

?
public function __construct()
{
    // Set the maximum execution time
    set_time_limit(Kohana::$config->load('codebench')->max_execution_time);
}

public run( ) (defined in Kohana_Codebench) link to this

Runs Codebench on the extending class.

Return Values

array - Benchmark output

Source Code

?
public function run()
{
    // Array of all methods to loop over
    $methods = array_filter(get_class_methods($this), array($this, '_method_filter'));
 
    // Make sure the benchmark runs at least once,
    // also if no subject data has been provided.
    if (empty($this->subjects))
    {
        $this->subjects = array('NULL' => NULL);
    }
 
    // Initialize benchmark output
    $codebench = array
    (
        'class'       => get_class($this),
        'description' => $this->description,
        'loops'       => array
        (
            'base'    => (int) $this->loops,
            'total'   => (int) $this->loops * count($this->subjects) * count($methods),
        ),
        'subjects'    => $this->subjects,
        'benchmarks'  => array(),
    );
 
    // Benchmark each method
    foreach ($methods as $method)
    {
        // Initialize benchmark output for this method
        $codebench['benchmarks'][$method] = array('time' => 0, 'memory' => 0);
 
        // Using Reflection because simply calling $this->$method($subject) in the loop below
        // results in buggy benchmark times correlating to the length of the method name.
        $reflection = new ReflectionMethod(get_class($this), $method);
 
        // Benchmark each subject on each method
        foreach ($this->subjects as $subject_key => $subject)
        {
            // Prerun each method/subject combo before the actual benchmark loop.
            // This way relatively expensive initial processes won't be benchmarked, e.g. autoloading.
            // At the same time we capture the return here so we don't have to do that in the loop anymore.
            $return = $reflection->invoke($this, $subject);
 
            // Start the timer for one subject
            $token = Profiler::start('codebench', $method.$subject_key);
 
            // The heavy work
            for ($i = 0; $i < $this->loops; ++$i)
            {
                $reflection->invoke($this, $subject);
            }
 
            // Stop and read the timer
            $benchmark = Profiler::total($token);
 
            // Benchmark output specific to the current method and subject
            $codebench['benchmarks'][$method]['subjects'][$subject_key] = array
            (
                'return' => $return,
                'time'   => $benchmark[0],
                'memory' => $benchmark[1],
            );
 
            // Update method totals
            $codebench['benchmarks'][$method]['time']   += $benchmark[0];
            $codebench['benchmarks'][$method]['memory'] += $benchmark[1];
        }
    }
 
    // Initialize the fastest and slowest benchmarks for both methods and subjects, time and memory,
    // these values will be overwritten using min() and max() later on.
    // The 999999999 values look like a hack, I know, but they work,
    // unless your method runs for more than 31 years or consumes over 1GB of memory.
    $fastest_method = $fastest_subject = array('time' => 999999999, 'memory' => 999999999); 
    $slowest_method = $slowest_subject = array('time' => 0, 'memory' => 0);
 
    // Find the fastest and slowest benchmarks, needed for the percentage calculations
    foreach ($methods as $method)
    {
        // Update the fastest and slowest method benchmarks
        $fastest_method['time']   = min($fastest_method['time'],   $codebench['benchmarks'][$method]['time']);
        $fastest_method['memory'] = min($fastest_method['memory'], $codebench['benchmarks'][$method]['memory']);
        $slowest_method['time']   = max($slowest_method['time'],   $codebench['benchmarks'][$method]['time']);
        $slowest_method['memory'] = max($slowest_method['memory'], $codebench['benchmarks'][$method]['memory']);
 
        foreach ($this->subjects as $subject_key => $subject)
        {
            // Update the fastest and slowest subject benchmarks
            $fastest_subject['time']   = min($fastest_subject['time'],   $codebench['benchmarks'][$method]['subjects'][$subject_key]['time']);
            $fastest_subject['memory'] = min($fastest_subject['memory'], $codebench['benchmarks'][$method]['subjects'][$subject_key]['memory']);
            $slowest_subject['time']   = max($slowest_subject['time'],   $codebench['benchmarks'][$method]['subjects'][$subject_key]['time']);
            $slowest_subject['memory'] = max($slowest_subject['memory'], $codebench['benchmarks'][$method]['subjects'][$subject_key]['memory']);
        }
    }
 
    // Percentage calculations for methods
    foreach ($codebench['benchmarks'] as & $method)
    {
        // Calculate percentage difference relative to fastest and slowest methods
        $method['percent']['fastest']['time']   = (empty($fastest_method['time']))   ? 0 : ($method['time']   / $fastest_method['time']   * 100);
        $method['percent']['fastest']['memory'] = (empty($fastest_method['memory'])) ? 0 : ($method['memory'] / $fastest_method['memory'] * 100);
        $method['percent']['slowest']['time']   = (empty($slowest_method['time']))   ? 0 : ($method['time']   / $slowest_method['time']   * 100);
        $method['percent']['slowest']['memory'] = (empty($slowest_method['memory'])) ? 0 : ($method['memory'] / $slowest_method['memory'] * 100);
 
        // Assign a grade for time and memory to each method
        $method['grade']['time']   = $this->_grade($method['percent']['fastest']['time']);
        $method['grade']['memory'] = $this->_grade($method['percent']['fastest']['memory']);
 
        // Percentage calculations for subjects
        foreach ($method['subjects'] as & $subject)
        {
            // Calculate percentage difference relative to fastest and slowest subjects for this method
            $subject['percent']['fastest']['time']   = (empty($fastest_subject['time']))   ? 0 : ($subject['time']   / $fastest_subject['time']   * 100);
            $subject['percent']['fastest']['memory'] = (empty($fastest_subject['memory'])) ? 0 : ($subject['memory'] / $fastest_subject['memory'] * 100);
            $subject['percent']['slowest']['time']   = (empty($slowest_subject['time']))   ? 0 : ($subject['time']   / $slowest_subject['time']   * 100);
            $subject['percent']['slowest']['memory'] = (empty($slowest_subject['memory'])) ? 0 : ($subject['memory'] / $slowest_subject['memory'] * 100);
 
            // Assign a grade letter for time and memory to each subject
            $subject['grade']['time']   = $this->_grade($subject['percent']['fastest']['time']);
            $subject['grade']['memory'] = $this->_grade($subject['percent']['fastest']['memory']);
        }
    }
 
    return $codebench;
}

protected _grade( integer|double $score ) (defined in Kohana_Codebench) link to this

Returns the applicable grade letter for a score.

Parameters

integer|double $score required - Score

Return Values

string - Grade letter

Source Code

?
protected function _grade($score)
{
    foreach ($this->grades as $max => $grade)
    {
        if ($max === 'default')
            continue;
 
        if ($score <= $max)
            return $grade;
    }
 
    return $this->grades['default'];
}

protected _method_filter( string $method ) (defined in Kohana_Codebench) link to this

Callback for array_filter(). Filters out all methods not to benchmark.

Parameters

string $method required - Method name

Return Values

boolean

Source Code

?
protected function _method_filter($method)
{
    // Only benchmark methods with the "bench" prefix
    return (substr($method, 0, 5) === 'bench');
}

Modules

Bench_StripNullBytes extends Codebench extends Kohana_Codebench

Constants

Properties

Methods

Propertieslink to this

public $descriptionlink to this

public array $gradeslink to this

public $loopslink to this

public $subjectslink to this

Methodslink to this

public bench_preg_replace( ) (defined in Bench_StripNullBytes) link to this

Source Code

public bench_str_replace( ) (defined in Bench_StripNullBytes) link to this

Source Code

public bench_strtr( ) (defined in Bench_StripNullBytes) link to this

Source Code

public __construct( ) (defined in Kohana_Codebench) link to this

Return Values

Source Code

public run( ) (defined in Kohana_Codebench) link to this

Return Values

Source Code

protected _grade( integer|double $score ) (defined in Kohana_Codebench) link to this

Parameters

Return Values

Source Code

protected _method_filter( string $method ) (defined in Kohana_Codebench) link to this

Parameters

Return Values

Source Code

Bench_StripNullBytes
extends Codebench
extends Kohana_Codebench

public `array` $gradeslink to this