getrusage

(PHP 4, PHP 5)

getrusage — Gets the current resource usages

Description

array getrusage ( [int $who] )

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

Parameters

who: 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.

Examples

Example 1799. getrusage() example


<?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)

?>

Notes

Note: This function is not implemented on Windows platforms.


The author of the article mentioned in the previous post says "Once I got a negative value for both times - I have absolutely no clue how that can happen.". This is because time in microseconds is not padded with zeros from the left, therefore, you cannot concatenate the two numbers. Instead, you should normalize the values and then add them up:



$dat["ru_utime.tv_sec"]*1e6+$dat["ru_utime.tv_usec"];

ng4rrjanbiah at rediffmail dot com
17-Nov-2004 10:51


Here is a nice comment on benchmarking PHP codes using getrusage function http://blog.rompe.org/node/85



HTH,

R. Rajesh Jeba Anbiah

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Last updated: Fri, 01 Jun 2007