CPU performance tuning tips when building a web server on CentOS

CPU performance tuning tips when building a web server on CentOS

Introduction:
In the process of building a web server, it is very important to optimize the performance of the server , especially CPU performance. Reasonable tuning can improve server performance and stability, while reducing resource consumption and improving user experience. This article will introduce some CPU performance tuning techniques when building a web server on the CentOS operating system, and provide corresponding code examples.

1. Set the CPU scheduling policy
In the CentOS system, the default CPU scheduling policy focuses on interactive performance, that is, the default setting is "canoe". But in a web server environment, more emphasis is often placed on load balancing. We can set the CPU scheduling policy to "performance" to improve the performance of the web server.

Code sample:

# 查看当前的CPU调度策略
cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor

# 将CPU调度策略设置为performance
for i in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor; do echo performance > $i; done

2. Using reverse proxy and load balancing
In the web server architecture, using reverse proxy and load balancing can distribute requests to multiple backends On the server, achieve load balancing and improve concurrency. On CentOS, we can use Nginx as a reverse proxy and load balancing server.

Code example:

# 安装Nginx
yum install nginx

# 修改Nginx配置文件
vi /etc/nginx/nginx.conf

# 在http部分添加以下配置
http {
    ...
    upstream backend {
        server backend1.example.com;
        server backend2.example.com;
    }
    ...
    
    # 负载均衡策略配置
    server {
        ...
        location / {
            proxy_pass http://backend;
        }
        ...
    }
    ...
}

# 启动Nginx服务
systemctl start nginx

# 设置Nginx开机自启动
systemctl enable nginx

3. Enable CPU cache
Enabling CPU cache can improve CPU performance and reduce the number of memory accesses. On CentOS, we can enable or optimize the CPU cache by adjusting some parameters.

Code example:

# 查看CPU缓存策略
cat /sys/devices/system/cpu/cpu*/cpufreq/cpuinfo_cache_policy

# 设置CPU缓存策略为Write Back
for i in /sys/devices/system/cpu/cpu*/cpufreq/cpuinfo_cache_policy; do echo writeback > $i; done

# 设置缓存内存调度策略为负载均衡
echo 1 > /proc/sys/vm/page-cluster

4. Parallel processing of requests
In web servers, parallel processing of requests can improve the concurrency performance of the server. On CentOS, we can perform parallel processing by setting the thread pool size.

Code example:

# 修改Apache配置文件
vi /etc/httpd/conf/httpd.conf

# 找到以下两行，修改为合适的值
StartServers       8     # 初始启动的进程数
MaxRequestWorkers  150   # 最大的并发请求处理数

Conclusion:
Through the above CPU performance tuning techniques, we can improve the CPU performance and stability in the web server built on CentOS, and improve users experience. At the same time, we also provide corresponding code examples for each technique to help readers better understand and implement them.

In actual applications, we can adjust and optimize according to specific needs and server configuration. At the same time, you should also pay attention to monitoring the performance indicators of the server and make timely adjustments and optimizations to ensure the normal operation of the server.

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