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大并发高负载下的PHP-FPM参数调优

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Jun 23, 2016 pm 01:25 PM

大并发高负载下的PHP-FPM参数调优

主要针对PHP在Linux下的参数调优

调整文件描述符限制

# ulimit -n 1000000

# vi /etc/security/limits.conf

# Setting Shell Limits for File Descriptors

* soft nofile 1000000

* hard nofile 1000000

禁止PHP代码文件所在分区的文件系统访问时间更新

# vi /etc/fstab

比如PHP代码所在分区:

/dev/sdb1 ext4 errors=remount-ro 0 1

修改为:

/dev/sdb1 ext4 noatime,nodiratime,errors=remount-ro 0 1

将临时文件存储到tmpfs

（需要注意的地方）在网站有需要处理大量的小图片上传的时候,使用内存文件系统tmpfs来存储,可以减少一些I/O的开销.但是如果用户是上传非常大的文件(比如:视频)的话,就不适合使用tmpfs.

# vi /etc/fstab

tmpfs /tmp tmpfs defaults,nosuid,noatime 0 0

php.ini配置调优

# 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'

注意这里设置max_execution_time只有5秒.对于一个快的web应用来说,我们真的不想要web应用里有任何长时间运行的web请求,一个web请求持续超过5秒通常意味着有些东西出了问题.我们的目标是页面响应在300-500ms之内.

PHP-FPM配置调优

# vi php-fpm.conf

[my_app]

;FastCGI/PHP-FPM使用UNIX Sockets

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

listen.backlog = 300

user = www

group = www

pm = dynamic

;估算pm.max_children = (MAX_MEMORY - 500MB) / 20MB

pm.max_children = 100

;推荐为最大的pm.max_children的%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

以上就是这些参数的总结

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