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getrusage — Returns an array of resource usage.


array getrusage([who]);
int who (optional): Include RUSAGE_CHILDREN


Associative array


This function is based on the UNIX getrusage() system function. getrusage() is used to get resource limits. Using the optional who parameter, the RUSAGE_CHILDREN flag will be used, which returns additional resource information. The default is RUSAGE_SELF . While a more complete description can be found in the UNIX man page for getrusage() , a summary is included below.

ru_utime.tv_usec User time used (microseconds)
ru_utime.tv_sec User time used (seconds)
ru_stime.tv_usec System time used (microseconds)
ru_stime.tv_sec System time used (seconds)
ru_maxrss Maximum resident shared size
ru_ixrss Integral shared memory size
ru_idrss Integral unshared data size
ru_isrss Integral unshared stack size
ru_minflt Number of page reclaims
ru_majflt Number of page faults
ru_inblock Number of block input operations
ru_outblock Number of block output operations
ru_msgsnd Number of messages sent
ru_msgrsv Number of messages received
ru_nsignals Number of signals received
ru_nvcsw Number of voluntary context switches
ru_nivcsw Number of involuntary context switches


Existing since version 3.0.7


Example 1006. Display rusage information

$usage = getrusage();
foreach ($usage as $key=>$val) {
   echo "$key => $val\n";

PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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