大并发高负载下的PHP-FPM参数调优
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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