nginx长连接与短连接性能对比_nginx短连接

 上一篇文章搭建了plg日志监控，本次准备看下目前集群的性能。
	对应机器如下：虚机4，前一后三，4台配置均为4核4g
	物理机为20核32g台式机。
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先进行原始nginx配置的压测 nginx配置如下：

user  nginx;
worker_processes  1;

error_log  /var/log/nginx/error.log warn;
pid        /var/run/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;
	#配置nginx  json格式日志
    log_format  main  '{"@timestamp": "$time_local", '
                        '"remote_addr": "$remote_addr", '
                        '"referer": "$http_referer", '
                        '"request": "$request", '
                        '"status": $status, '
                        '"bytes": $body_bytes_sent, '
                        '"agent": "$http_user_agent", '
                        '"x_forwarded": "$http_x_forwarded_for", '
                        '"up_addr": "$upstream_addr",'
                        '"up_host": "$upstream_http_host",'
                        '"up_resp_time": "$upstream_response_time",'
                        '"request_time": "$request_time"'
                        ' }';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    keepalive_timeout  65;

    #gzip  on;
    upstream test.miaohr.com {
	server 192.168.175.128:8070;
	server 192.168.175.129:8070;
	server 192.168.175.130:8070;
    }
    

    server {   
        listen       80;   
        server_name  test.miaohr.com;   
        charset utf-8;   
        location / {   
            root   html;   
            index  index.html index.htm;   
            proxy_pass        http://test.miaohr.com;   
            proxy_set_header  X-Real-IP  $remote_addr;   
            client_max_body_size  100m;
        }   
  
  
   
    }   
}
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使用jmeter5.0进行压测，压测命令如下

jmeter -n -t  D:/testYc.jmx  -l D:/result.txt -e -o D:/webreport
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其中
D:/testYc.jmx ------> 测试计划文件的路径
D:/result.txt ------> 将要生成的测试结果文件的存放路径
D:/webreport -------> 将要生成的web报告的保存路径
使用物理机cmd命令进行压测。线程为200，持续100s，报告如下

此时rt为180ms+,tps在980左右

修改nginx配置为长连接，长连接配置如下

user  nginx;
worker_processes  1;

error_log  /var/log/nginx/error.log warn;
pid        /var/run/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;
	#配置nginx  json格式日志
    log_format  main  '{"@timestamp": "$time_local", '
                        '"remote_addr": "$remote_addr", '
                        '"referer": "$http_referer", '
                        '"request": "$request", '
                        '"status": $status, '
                        '"bytes": $body_bytes_sent, '
                        '"agent": "$http_user_agent", '
                        '"x_forwarded": "$http_x_forwarded_for", '
                        '"up_addr": "$upstream_addr",'
                        '"up_host": "$upstream_http_host",'
                        '"up_resp_time": "$upstream_response_time",'
                        '"request_time": "$request_time"'
                        ' }';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    keepalive_timeout  65;

    #gzip  on;
    upstream test.miaohr.com {
	server 192.168.175.128:8070;
	server 192.168.175.129:8070;
	server 192.168.175.130:8070;
	keepalive 500;#最大空闲连接数
    }
    

    server {   
        listen       80;   
        server_name  test.miaohr.com;   
        charset utf-8;   
        location / {   
            root   html;   
            index  index.html index.htm;   
            proxy_pass        http://test.miaohr.com;   
            proxy_set_header  X-Real-IP  $remote_addr;   
            client_max_body_size  100m;
        }   
  
  
   
    } 

location / {
                proxy_pass http://test-api;
                proxy_set_header Host $host;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header REMOTE-HOST $remote_addr;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_http_version 1.1;              # 设置http版本为1.1
                proxy_set_header Connection "";      # 设置Connection为长连接（默认为no）
      }


}
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进行第二次压测，报告如下

本次压测，rt降低到76ms，tps上升到2400+。对比短连接，集群的性能得到了很大的提升。但错误率指标有所上升。根据jmeter执行日志查看， 报错集中为以下内容

1650551535574,485,HTTP请求,Non HTTP response code: java.net.BindException,Non HTTP response message: Address already in use: connect,线程组 1-135,text,false,,2437,0,200,200,http://192.168.175.131/getSxbm,0,0,485
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根据查阅后发现，这是由于压测机为windows系统，tcp端口资源来不及释放导致。与集群性能无关

长连接与短连接的区别，主要在于长连接模式下，不需要频繁的建立起tcp连接，同时也不需要频繁关闭，节省了这部分资源的消耗。这种情况下比较适合频繁请求的场景下。