(PHP 4, PHP 5, PHP 7)

getrusageGets the current resource usages


array getrusage ([ int $who = 0 ] )

This is an interface to getrusage(2). It gets data returned from the system call.



If who 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.


Example #1 getrusage() example

$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)


Version Description
7.0.0 This function is now supported on Windows.



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 if who is RUSAGE_SELF)
  • "ru_maxrss" (only if who is RUSAGE_SELF)

If getrusage() is called with who set to 1 (RUSAGE_CHILDREN), then resource usage for threads are collected (meaning that internally the function is called with RUSAGE_THREAD).


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)

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User Contributed Notes 2 notes

Domas Mituzas
10 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.
jlh at gmx dot ch
1 year 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.
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