列出前 20 名耗用記憶體的程式：
針對第四欄 %MEM
盒子小站root@linux # ps auxw|head -1;ps auxw|sort -rn -k4|head -20
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
mysql 3131 6.5 28.9 14345772 9443540 ? Ssl 2023 43123:07 /usr/libexec/mysqld --basedir=/usr
apache 31255 2.7 4.8 5612924 1574440 ? S 07:07 1:13 php-fpm: pool www
apache 32520 5.5 4.5 5637016 1474820 ? S 07:23 1:38 php-fpm: pool www
apache 32438 3.5 4.5 5604968 1466688 ? S 07:22 1:06 php-fpm: pool www
apache 32314 1.7 4.5 5599032 1486664 ? S 07:21 0:33 php-fpm: pool www
apache 31253 3.9 4.4 5600980 1458840 ? S 07:07 1:47 php-fpm: pool www
apache 31843 4.1 4.3 5598816 1412944 ? S 07:16 1:31 php-fpm: pool www
apache 31303 6.5 4.3 5610804 1410056 ? S 07:08 2:55 php-fpm: pool www
apache 31393 1.1 4.2 5245564 1397644 ? S 07:09 0:30 php-fpm: pool www
apache 31224 7.3 4.2 5233776 1372984 ? S 07:07 3:21 php-fpm: pool www
apache 32545 5.5 4.0 5611312 1317548 ? S 07:23 1:36 php-fpm: pool www
apache 32527 4.8 4.0 5621396 1307124 ? R 07:23 1:25 php-fpm: pool www
apache 32505 4.3 4.0 5604880 1333072 ? S 07:23 1:16 php-fpm: pool www
apache 32503 3.7 4.0 5607168 1313580 ? S 07:23 1:06 php-fpm: pool www
apache 31434 2.9 4.0 5244716 1311764 ? S 07:10 1:15 php-fpm: pool www
apache 1535 10.2 3.9 5633084 1289360 ? R 07:34 1:52 php-fpm: pool www
apache 32592 9.7 3.8 5597456 1270360 ? S 07:24 2:46 php-fpm: pool www
apache 32574 9.0 3.7 5237700 1226796 ? S 07:24 2:35 php-fpm: pool www
apache 32567 3.9 3.7 5242108 1220988 ? S 07:24 1:08 php-fpm: pool www
apache 863 10.0 3.6 5243820 1199404 ? S 07:31 2:09 php-fpm: pool wwwroot@linux # top
top - 07:51:39 up 459 days, 8:06, 1 user, load average: 7.77, 6.27, 4.45
Tasks: 206 total, 7 running, 127 sleeping, 0 stopped, 0 zombie
%Cpu(s): 43.1 us, 6.4 sy, 0.0 ni, 24.2 id, 16.5 wa, 0.0 hi, 1.1 si, 8.6 st
KiB Mem : 32577108 total, 298452 free, 11612312 used, 20666344 buff/cache
KiB Swap: 0 total, 0 free, 0 used. 16598352 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
863 apache 20 0 5266052 1.2g 1.1g R 92.0 3.7 1:46.78 php-fpm
619 apache 20 0 5254932 1.1g 1.0g R 84.3 3.4 1:06.67 php-fpm
32503 apache 20 0 5626068 1.2g 1.2g R 66.0 4.0 0:57.38 php-fpm
3131 mysql 20 0 13.7g 9.0g 11944 S 41.3 29.0 43122:32 mysqld
953 apache 20 0 5605044 1.1g 1.0g S 28.3 3.4 1:52.94 php-fpm
884 apache 20 0 5614556 1.1g 1.0g R 19.3 3.5 2:04.48 php-fpm
32505 apache 20 0 5621264 1.3g 1.2g S 15.3 4.1 1:12.52 php-fpm
32537 apache 20 0 5610024 1.1g 1.1g S 7.7 3.7 2:20.79 php-fpm
32545 apache 20 0 5603120 1.2g 1.2g S 7.7 3.9 1:35.44 php-fpm
988 apache 20 0 4682532 62460 9036 S 7.0 0.2 0:09.81 httpd
32438 apache 20 0 5611112 1.4g 1.3g S 7.0 4.4 1:04.86 php-fpm
2741 apache 20 0 5593360 479168 447236 S 4.3 1.5 0:03.06 php-fpm
32520 apache 20 0 5628824 1.3g 1.3g S 4.3 4.3 1:36.79 php-fpm
31843 apache 20 0 5592672 1.3g 1.3g S 4.0 4.3 1:29.78 php-fpm
1500 apache 20 0 5239952 1.1g 1.0g S 3.7 3.5 0:13.62 php-fpm
31434 apache 20 0 5226144 1.2g 1.2g R 0.7 4.0 1:06.82 php-fpm
32211 apache 20 0 4879140 69164 9036 S 0.7 0.2 0:15.23 httpd
32320 apache 20 0 4485988 60528 9032 S 0.7 0.2 0:13.47 httpd
32760 apache 20 0 4748068 60620 9036 S 0.7 0.2 0:13.79 httpd
2786 apache 20 0 5248472 528236 483224 S 0.3 1.6 0:36.95 php-fpm
3775 root 0 -20 0 0 0 I 0.3 0.0 1:45.76 kworker/7:1H
31393 apache 20 0 5220988 1.3g 1.3g S 0.3 4.1 0:28.15 php-fpm
輸入網址
http://SERVER_IP/fpm_status123?full
可以看到如下訊息：
pool: www
process manager: dynamic
start time: 20/Aug/2024:02:02:02 +0800
start since: 42434
accepted conn: 37857
listen queue: 0
max listen queue: 0
listen queue len: 0
idle processes: 19
active processes: 1
total processes: 20
max active processes: 25
max children reached: 0
slow requests: 0
************************
pid: 6447
state: Idle
start time: 20/Aug/2024:13:29:49 +0800
start since: 1167
requests: 74 注意這個數字
request duration: 261851
request method: POST
request URI: /wp-admin/admin-ajax.php
content length: 96
user: -
script: /var/www/html/wp-admin/admin-ajax.php
last request cpu: 38.19
last request memory: 2097152
************************
pid: 6737
state: Idle
start time: 20/Aug/2024:13:43:30 +0800
start since: 346
requests: 16
request duration: 85831
request method: GET
request URI: /index.php
content length: 0
user: -
script: /var/www/html/index.php
last request cpu: 81.56
last request memory: 29704192 相當於28MB
************************
pid: 8154
state: Running
start time: 20/Aug/2024:13:43:30 +0800
start since: 346
requests: 10
request duration: 275
request method: GET
request URI: /fpm_status?full
content length: 0
user: -
script: -
last request cpu: 0.00
last request memory: 0
::
::
解釋
pid - the PID of the process;
state - the state of the process (Idle, Running, ...);
start time - the date and time the process has started;
start since - 此 process 已經活了多久秒數
requests - 這個process 已經處理多少 request 數目
當達到 pm.max_requests 數字時 就會關閉此porcess
request duration - 執行此 request (也就是執行此 php) 花費多久時間 (單位 µs 百萬分一秒)
這數字若太大(如超過1秒)，表示相關的 php 執行的太慢(php code太複雜?或有bug?)
request method - the request method (GET, POST, ...);
request URI - the request URI with the query string;
content length - the content length of the request (only with POST);
user - the user (PHP_AUTH_USER) (or '-' if not set);
script - the main script called (or '-' if not set);
last request cpu - the %cpu the last request consumed
it's always 0 if the process is not in Idle state
because CPU calculation is done when the request
processing has terminated;
last request memory - 處理最後一個 request 後，使用的最大記憶體注意
這方法 並不是真正解決 php-fpm 記憶體洩漏問題
而是讓占用記憶體的 php-fpm 早一點 "自動關閉"，釋放出記憶體
修改檔案 /etc/php-fpm/www.conf
pm.max_requests = 130
原解釋：
; The number of requests each child process should execute before respawning.
; This can be useful to work around memory leaks in 3rd party libraries. For
; endless request processing specify '0'. Equivalent to PHP_FCGI_MAX_REQUESTS.
pm.max_requests 內定是 0
將這變數設一個值
例如:
pm.max_requests = 100
重啟 php-fpm 後，觀察幾天 再來增減數字有兩個檔案要設定：
1. php-fpm 設定 修改檔案 /etc/php-fpm/www.conf
pm.status_path = /fpm_status2. apahce httpd 設定
/etc/httpd/httpd.conf
<LocationMatch "/fpm_status123">
Order Allow,Deny
Allow from 127.0.0.1 123.xx.xx.xx 輸入允許瀏覽此網頁的IP(自己的IP)
ProxyPass unix:/var/run/php-fpm/www.sock|fcgi://localhost/fpm_status
</LocationMatch>
# /var/run/php-fpm/www.sock 要跟檔案 /etc/php-fpm/www.conf 中的 listen= 相同
# 例如 listen = /var/run/php-fpm/www.sock設定完
再重啟 php-fpm、apache httpd 即可
重啟 php-fpm
systemctl reload php-fpm
重啟 apache httpd
apachectl graceful
輸入網址即可看到 php-fpm 狀態
http://SERVER_IP/fpm_status123?full
