为什么要有Benchmark组件?
对于一个项目而言,不仅是要运行起来那么简单,还需要考到性能问题,而Benchmark组件可以帮助开发者监控程序运行时间运行内存,这就让开发者可以知道具体优化哪些地方。
Benchmark可以收集哪些数据?
Benchmark只有三个函数:
/**
* Set a benchmark marker
*
* Multiple calls to this function can be made so that several
* execution points can be timed.
*
* @param string $name Marker name
* @return void
*/
public function mark($name)
{
$this->marker[$name] = microtime(TRUE);
}
/**
* Elapsed time
*
* Calculates the time difference between two marked points.
*
* If the first parameter is empty this function instead returns the
* {elapsed_time} pseudo-variable. This permits the full system
* execution time to be shown in a template. The output class will
* swap the real value for this variable.
*
* @param string $point1 A particular marked point
* @param string $point2 A particular marked point
* @param int $decimals Number of decimal places
*
* @return string Calculated elapsed time on success,
* an '{elapsed_string}' if $point1 is empty
* or an empty string if $point1 is not found.
*/
public function elapsed_time($point1 = '', $point2 = '', $decimals = 4)
{
if ($point1 === '')
{
return '{elapsed_time}';
}
if ( ! isset($this->marker[$point1]))
{
return '';
}
if ( ! isset($this->marker[$point2]))
{
$this->marker[$point2] = microtime(TRUE);
}
return number_format($this->marker[$point2] - $this->marker[$point1], $decimals);
}
/**
* Memory Usage
*
* Simply returns the {memory_usage} marker.
*
* This permits it to be put it anywhere in a template
* without the memory being calculated until the end.
* The output class will swap the real value for this variable.
*
* @return string '{memory_usage}'
*/
public function memory_usage()
{
return '{memory_usage}';
}
如何手记这些数据
$BM->mark('loading_time:_base_classes_start');
$BM->mark('loading_time:_base_classes_end');
$BM->elapsed_time('loading_time:_base_classes_start', 'oading_time:_base_classes_end');