getopt
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.
getrusage
(PHP 4, PHP 5)
getrusage — Obtém a utilização de recursos
Descrição
array getrusage
([ int $who
] )
Esta é uma interface para getrusage(2). Ela obtém informação retornada pela chamada do sistema.
Parâmetros
- who
-
Se who é 1, getrusage será chamada com RUSAGE_CHILDREN.
Valor Retornado
Retorna um array associativo contendo a informação retornado pela chamada do sistema. Todas entradas são acessíveis usando os seus documentados nomes de campos.
Exemplos
Exemplo #1 Exemplo da getrusage()
<?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)
?>
Notas
Nota: esta função não é implementada na plataforma Windows
Veja Também
- Man page do seu sistema em getrusage(2)
add a note
User Contributed Notesgetrusage
Domas Mituzas
14-Jan-2008 10:22
14-Jan-2008 10:22
php at lavrenko dot pp dot ru
20-Oct-2005 01:21
20-Oct-2005 01:21
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 11:51
17-Nov-2004 11:51
Here is a nice comment on benchmarking PHP codes using getrusage function http://blog.rompe.org/node/85
HTH,
R. Rajesh Jeba Anbiah