getrusage
(PHP 4, PHP 5, PHP 7, PHP 8)
getrusage — 获取当前资源使用状况
说明
getrusage(int
$who = 0): array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
示例 #1 getrusage() 例子
<?php
$dat = getrusage();
echo $dat["ru_oublock"]; // number of block output operations
echo $dat["ru_inblock"]; // number of block input operations
echo $dat["ru_msgsnd"]; // number of IPC messages sent
echo $dat["ru_msgrcv"]; // number of IPC messages received
echo $dat["ru_maxrss"]; // maximum resident set size
echo $dat["ru_ixrss"]; // integral shared memory size
echo $dat["ru_idrss"]; // integral unshared data size
echo $dat["ru_minflt"]; // number of page reclaims (soft page faults)
echo $dat["ru_majflt"]; // number of page faults (hard page faults)
echo $dat["ru_nsignals"]; // number of signals received
echo $dat["ru_nvcsw"]; // number of voluntary context switches
echo $dat["ru_nivcsw"]; // number of involuntary context switches
echo $dat["ru_nswap"]; // number of swaps
echo $dat["ru_utime.tv_usec"]; // user time used (microseconds)
echo $dat["ru_utime.tv_sec"]; // user time used (seconds)
echo $dat["ru_stime.tv_usec"]; // system time used (microseconds)
?>
更新日志
| 版本 | 说明 |
|---|---|
| 7.0.0 | 此函数现在开始支持 Windows。 |
注释
注意:
在 Windows 上 getrusage() 仅会返回以下类型：
"ru_stime.tv_sec""ru_stime.tv_usec""ru_utime.tv_sec""ru_utime.tv_usec""ru_majflt"(only ifwhoisRUSAGE_SELF)"ru_maxrss"(only ifwhoisRUSAGE_SELF)If getrusage() is called with
whoset to1(RUSAGE_CHILDREN), then resource usage for threads are collected (meaning that internally the function is called withRUSAGE_THREAD).
注意:
在 BeOS 2000，仅会返回以下类型：
"ru_stime.tv_sec""ru_stime.tv_usec""ru_utime.tv_sec""ru_utime.tv_usec"
参见
- 你系统上 getrusage(2) 的 man page
add a note
User Contributed Notes 3 notes
jlh at gmx dot ch ¶
5 years ago
Note that this function returns rusage of the current process. In a web environment where you have long running apache processes that serve several requests with PHP executions, this will return cumulative timings and is therefore not suitable for telling how much user time your used. The best you could do is to call getrusage() once at the beginning and once at the end and calculate the difference.
Domas Mituzas ¶
14 years ago
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.
Anonymous ¶
4 years ago
BeOS support is removed in PHP 7.3:
https://github.com/php/php-src/blob/php-7.3.0alpha1/NEWS