使用xhprof在开发环境中测试php性能

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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