1. 前言
在做服务端压测的时候,经常会遇到一些由于Linux系统限制导致压力上不去的情况,这里从Linux系统参数上做一些调优,减少此类因素的干扰。
2. 配置
2.1 Linux系统配置
net.ipv4.tcp_syncookies = 0
fs.file-max = 12553500
fs.nr_open = 12453500
kernel.shmall= 1048576
kernel.shmmax = 1887436
kernel.msgmax = 65536
kernel.sysrq = 0
kernel.pid_max= 65536
net.core.netdev_max_backlog = 2000000
net.core.rmem_default = 699040
net.core.rmem_max = 50331648
net.core.wmem_default = 131072
net.core.wmem_max = 33554432
net.core.somaxconn = 65535
net.ipv4.ip_nonlocal_bind = 1
net.ipv4.tcp_max_orphans = 3276800
net.ipv4.tcp_mem = 1048576 1572864 2097152
net.ipv4.tcp_rmem = 4096 4194304 8388608
net.ipv4.tcp_wmem = 4096 4194304 8388608
net.ipv4.tcp_slow_start_after_idle = 0
net.ipv4.tcp_synack_retries = 1
net.ipv4.tcp_window_scaling = 1
vm.swappiness = 0#TCP connection recovery
net.ipv4.tcp_max_tw_buckets = 6000000
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_fin_timeout = 10
net.ipv4.route.max_size = 5242880
net.ipv4.ip_forward = 1
net.ipv4.tcp_timestamps = 1
#开启对于TCP时间戳的支持,若该项设置为0,则下面一项设置不起作用#TCP connection manager
net.ipv4.tcp_max_syn_backlog = 655360
net.ipv4.tcp_syn_retries = 6
net.ipv4.tcp_retries1 = 3
net.ipv4.tcp_retries2 = 6#TCP keepalive
net.ipv4.ip_local_port_range = 1000 65534
net.ipv4.tcp_keepalive_time = 30
net.ipv4.tcp_keepalive_intvl = 30
net.ipv4.tcp_keepalive_probes = 3
fs.inotify.max_user_watches=524288
2.2 文件描述符限制
2.2.1 修改fileno的配置
执行:sudo vi /etc/security/limits.conf , 文末添加:
2.2.2 修改supervisor服务配置文件(如果是supervisor启动的程序,则可以修改此处)
sudo systemctl daemon-reload sudo systemctl restart supervisord.service
2.2.3 验证open files是否修改成功
#1. 先查询supervisor的pid ps aux |grep supervisor #2. 假如是22296,查看进程限制 cat /proc/22296/limits #3. 看到有下面一行就ok了 Max open files 1000000 1000000 files
2.3 /etc/security/limits.conf配置
limits.conf是Linux资源限制配置文件,为了性能测试,我们可以将其调大
* soft nofile 655350
* hard nofile 655350
* soft nproc 655350
* hard nproc 650000
进行了如上配置之后,在我们使用Jmeter等压测工具进行压测的时候,后端服务能享受到Linux软件层面的最大性能。传送门:2021最新测试资料&大厂职位
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