XHProf是一个分层PHP性能分析工具。它报告函数级别的请求次数和各种指标，包括阻塞时间，CPU时间和内存使用情况。现在我们来聊聊XHProf在开发环境中如何测试php性能。
以百分之一的概率产生测试数据，尽量不影响正式环境效率。
class XHProf {
// private $XHProfPath = 'xhprof/';
private $XHProfPath = '/usr/local/apache/htdocs/xhprof/';
private $applicationName = 'sias_application';
private $sampleSize = 100;
private static $enabled = false;
public function XHProf_Start() {
if (mt_rand(1, $this->sampleSize) == 1) {
include_once $this->XHProfPath . 'xhprof_lib/utils/xhprof_lib.php';
include_once $this->XHProfPath . 'xhprof_lib/utils/xhprof_runs.php';
xhprof_enable(XHPROF_FLAGS_NO_BUILTINS + XHPROF_FLAGS_CPU + XHPROF_FLAGS_MEMORY);
self::$enabled = true;
}
}
public function XHProf_End() {
if (self::$enabled) {
$XHProfData = xhprof_disable();
$XHProfRuns = new XHProfRuns_Default();
$XHProfRuns->save_run($XHProfData, $this->applicationName);
}
}
}测试效果：
Overall Summary Total Incl. Wall Time (microsec): 48,162 microsecs Total Incl. CPU (microsecs): 32,994 microsecs Total Incl. MemUse (bytes): 2,773,464 bytes Total Incl. PeakMemUse (bytes): 2,867,664 bytes Number of Function Calls: 749
从以下测试结果看出，耗时最多的居然是连接数据库，所以我们来尽量优化数据库。
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