Tuning of PHP-FPM parameters under large concurrent high load

Tuning of PHP-FPM parameters under large concurrent high load

Mainly for PHP parameter tuning under Linux

Adjust file descriptor limits

# ulimit-n 1000000

# vi/etc/security/limits.conf

# Setting Shell Limits for File descriptors

* Soft Nofile 1000000

* Hard Nofile 1000000

Prevents file system access time updates for the partition where the PHP code file resides

# Vi/etc/fstab

For example, the PHP code is located in the partition:

/DEV/SDB1 ext4 Errors=remount-ro 0 1

Modified to:

/DEV/SDB1 ext4 Noatime,nodiratime,errors=remount-ro 0 1

Storing temporary files to Tmpfs

(Where to note) when the site has to handle a large number of small image uploads, using the memory file system TMPFS to store, you can reduce the cost of some I/O. However, if the user is uploading very large files (such as video), it is not appropriate to use TMPFS.

# Vi/etc/fstab

Tmpfs/tmp Tmpfs defaults,nosuid,noatime 0 0

PHP.ini Configuration Tuning

# VI Php-app.ini

[PHP]

Engine = On

expose_php = Off

Max_execution_time = 5

Memory_limit = 256M

error_reporting = E_all & ~e_deprecated

Display_errors = Off

Display_startup_errors = Off

Html_errors = Off

Default_socket_timeout = 5

File_uploads = On

Upload_tmp_dir =/tmp/php

Upload_max_filesize = 50M

Post_max_size = 50M

Max_file_uploads = 20

Date.timezone = ' Asia/shanghai '

Note that this setting max_execution_time only 5 seconds. For a fast web app, we really don't want any long-running Web requests in the Web app, A Web request that lasts more than 5 seconds usually means something is wrong. Our goal is to page responses within 300-500MS.

PHP-FPM Configuration Tuning

# VI Php-fpm.conf

[My_app]

; FASTCGI/PHP-FPM using UNIX Sockets

Listen =/data/my_app/tmp/php.sock

Listen.backlog = 300

user = www

Group = www

PM = dynamic

; Estimated Pm.max_children = (MAX_MEMORY-500MB)/20MB

Pm.max_children = 100

Recommended for the largest Pm.max_children%10

Pm.start_servers = 10

Pm.min_spare_servers = 5

Pm.max_spare_servers = 15

pm.max_requests = 1000

Pm.status_path =/php_status

Request_terminate_timeout = 0

Request_slowlog_timeout = 0

Slowlog =/data/my_app/logs/slow.log

The above is the summary of these parameters

Tuning of PHP-FPM parameters under large concurrent high load