PHP: getrusage

Description

array getrusage ( [int who] )

This is an interface to getrusage(2). It returns an associative array containing the data returned from the system call. If who is 1, getrusage will be called with RUSAGE_CHILDREN.

All entries are accessible by using their documented field names.

Пример 1. 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) ?>
See your system's man page on getrusage(2) for more details.

Замечание: Для Windows-платформ эта функция не реализована.

getrusage

php at lavrenko dot pp dot ru
19-Oct-2005 04:21


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 02:51


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



HTH,

R. Rajesh Jeba Anbiah