getrusage
(PHP 4, PHP 5, PHP 7)
getrusage — Gets the current resource usages
Description
getrusage ([ int $who = 0 ] ) : array
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 #1 getrusage() example
Examples
Example #1 getrusage() example
<?php
$dat = getrusage();
echo $dat["ru_oublock"]; // number of block output operations
echo $dat["ru_inblock"]; // number of block input operations
echo $dat["ru_msgsnd"]; // number of IPC messages sent
echo $dat["ru_msgrcv"]; // number of IPC messages received
echo $dat["ru_maxrss"]; // maximum resident set size 單位應該是byte，這個數值基本可以顯示當前請求佔用的內存大小
echo $dat["ru_ixrss"]; // integral shared memory size
echo $dat["ru_idrss"]; // integral unshared data size
echo $dat["ru_minflt"]; // number of page reclaims (soft page faults)
echo $dat["ru_majflt"]; // number of page faults (hard page faults)
echo $dat["ru_nsignals"]; // number of signals received
echo $dat["ru_nvcsw"]; // number of voluntary context switches
echo $dat["ru_nivcsw"]; // number of involuntary context switches
echo $dat["ru_nswap"]; // number of swaps
echo $dat["ru_utime.tv_usec"]; // user time used (microseconds) 當前請求佔用的用戶態時間，消耗的用戶態cpu時間片累加起來
echo $dat["ru_utime.tv_sec"]; // user time used (seconds)
echo $dat["ru_stime.tv_usec"]; // system time used (microseconds)當前請求佔用的系統態時間，消耗的系統態cpu時間片累加起來，即需要系統調用消耗的時間。