Detailed explanation of how to check memory and CPU usage in php

伊谢尔伦
Release: 2023-03-12 06:02:01
Original
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1. View memory usage

Observing the memory usage of your program allows you to better optimize your code.
PHP has a garbage collection mechanism and a very complex memory management mechanism. You can find out how much memory your script is using. To know the current memory usage, you can use the ?memory_get_usage()function, if you want to know the peak memory usage, you can call thememory_get_peak_usage() function .

echo "Initial: ".memory_get_usage()." bytes \n"; /* 输出 Initial: 361400 bytes */ // 使用内存 for ($i = 0; $i < 100000; $i++) { $array []= md5($i); } // 删除一半的内存 for ($i = 0; $i < 100000; $i++) { unset($array[$i]); } echo "Final: ".memory_get_usage()." bytes \n"; /* prints Final: 885912 bytes */ echo "Peak: ".memory_get_peak_usage()." bytes \n"; /* 输出峰值 Peak: 13687072 bytes */
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2. Check the CPU usage
Use the ?getrusage() function to let you know the CPU usage. Note that this feature is not available under Windows.

print_r(getrusage()); /* 输出 Array ( [ru_oublock] => 0 [ru_inblock] => 0 [ru_msgsnd] => 2 [ru_msgrcv] => 3 [ru_maxrss] => 12692 [ru_ixrss] => 764 [ru_idrss] => 3864 [ru_minflt] => 94 [ru_majflt] => 0 [ru_nsignals] => 1 [ru_nvcsw] => 67 [ru_nivcsw] => 4 [ru_nswap] => 0 [ru_utime.tv_usec] => 0 [ru_utime.tv_sec] => 0 [ru_stime.tv_usec] => 6269 [ru_stime.tv_sec] => 0 ) */
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This structure seems very obscure, unless you know the CPU very well. Here are some explanations:

ru_oublock: block output operation
ru_inblock: block input operation
ru_msgsnd: sent message
ru_msgrcv: received message
ru_maxrss: maximum resident Retention set size
ru_ixrss: Total shared memory size
ru_idrss: Total non-shared memory size
ru_minflt: Page recycling
ru_majflt: Page invalidation
ru_nsignals: Received signals
ru_nvcsw: Active context switching
ru_nivcsw: Passive context switching
ru_nswap: Swap area
ru_utime.tv_usec: User mode time (microseconds)
ru_utime.tv_sec: User mode time (seconds)
ru_stime.tv_usec : System kernel time (microseconds)
ru_stime.tv_sec: System kernel time?(seconds)

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