[PHP 4, PHP 5, PHP 7, PHP 8]
getrusage — Gets the current resource usages
Description
getrusage[int $mode
= 0]: array|false
Parameters
mode
If mode
is 1, getrusage will be called with RUSAGE_CHILDREN
.
Return Values
Returns an associative array containing the data returned from the system call. All entries are accessible by using their documented field names. Returns false
on failure.
Changelog
7.0.0 | This function is now supported on Windows. |
Examples
Example #1 getrusage[] example
Notes
Note:
On Windows getrusage[] will only return the following members:
"ru_stime.tv_sec"
"ru_stime.tv_usec"
"ru_utime.tv_sec"
"ru_utime.tv_usec"
"ru_majflt"
[only ifmode
isRUSAGE_SELF
]"ru_maxrss"
[only ifmode
isRUSAGE_SELF
]If getrusage[] is called with
mode
set to1
[RUSAGE_CHILDREN
], then resource usage for threads are collected [meaning that internally the function is called withRUSAGE_THREAD
].
Note:
on BeOS 2000, only the following members are returned:
"ru_stime.tv_sec"
"ru_stime.tv_usec"
"ru_utime.tv_sec"
"ru_utime.tv_usec"
See Also
- Your system's man page on getrusage[2]
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.