文字
getrusage
(PHP 4, PHP 5, PHP 7)
getrusage — 获取当前资源使用状况
说明
array getrusage
([ int
$who = 0
] )这是 getrusage(2) 的接口。它返回了调用自系统的数据。
参数
-
who -
如果
who是 1，getrusage 会使用RUSAGE_CHILDREN来调用。
返回值
返回了一个包含系统返回数据的关联数组。所以条目均可通过文档中字段的名称来访问。
范例
Example #1 getrusage() 例子
<?php
$dat = getrusage ();
echo $dat [ "ru_nswap" ]; // number of swaps
echo $dat [ "ru_majflt" ]; // number of page faults
echo $dat [ "ru_utime.tv_sec" ]; // user time used (seconds)
echo $dat [ "ru_utime.tv_usec" ]; // user time used (microseconds)
?> 注释
Note: 此函数未在 Windows 平台下实现。
参见
- 你系统上 getrusage(2) 的 man page
用户评论:
[#1] Domas Mituzas [2008-01-14 13:22:12]
getrusage() reports kernel counters that are updated only once application loses context and a switch to kernel space happens. For example on modern Linux server kernels that would mean that getrusage() calls would return information rounded at 10ms, desktop kernels - at 1ms.
getrusage() isn't usable for micro-measurements at all - and getmicrotime(true) might be much more valuable resource.