Question

我正在对Nginx服务器进行负载测试，我遇到的问题是我的CPU达到100％，但只有50％的ram被利用。服务器是：

2 vCPU
2 GB of RAM
40GB SSD Drive
Rackspace High Performance Server

这是我的Nginx配置

worker_processes  2;
error_log  /var/log/nginx/error.log crit;

pid        /var/run/nginx.pid;

events {
    worker_connections  1524;
    use epoll;
    multi_accept on;
}

http {
    include   /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

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

    # Sendfile copies data between one FD and other from within the kernel.
    # More efficient than read() + write(), since the requires transferring data to and from the user space.
    sendfile on;

    # Tcp_nopush causes nginx to attempt to send its HTTP response head in one packet,
    # instead of using partial frames. This is useful for prepending headers before calling sendfile,
    # or for throughput optimization.
    tcp_nopush on;

    # don't buffer data-sends (disable Nagle algorithm). Good for sending frequent small bursts of data in real time.
    tcp_nodelay on;

    # allow the server to close the connection after a client stops responding. Frees up socket-associated memory.
    reset_timedout_connection on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    # send the client a "request timed out" if the body is not loaded by this time. Default 60.
    client_body_timeout 10;

    # If the client stops reading data, free up the stale client connection after this much time. Default 60.
    send_timeout 2;

    open_file_cache max=200000 inactive=20s;
    open_file_cache_valid 30s;
    open_file_cache_min_uses 2;
    open_file_cache_errors on;

    gzip  on;
    server_tokens off;

    client_max_body_size 20m;
    client_body_buffer_size 128k;

client_max_body_size 20m;
    client_body_buffer_size 128k;

    gzip_min_length 10240;
    gzip_proxied expired no-cache no-store private auth;
    gzip_types text/plain text/css text/xml text/javascript application/x-javascript application/xml;
    gzip_disable "MSIE [1-6]\.";

    # Load config files from the /etc/nginx/conf.d directory
    # The default server is in conf.d/default.conf

    fastcgi_cache_path /var/cache/nginx levels=1:2 keys_zone=microcache:10m max_size=1000m inactive=60m;

    include /etc/nginx/conf.d/*.conf;
    include /etc/nginx/sites-enabled/*;

}

/etc/sysctl.conf中的Kernal添加

# Increase system IP port limits to allow for more connections

net.ipv4.ip_local_port_range = 2000 65000


net.ipv4.tcp_window_scaling = 1


# number of packets to keep in backlog before the kernel starts dropping them
net.ipv4.tcp_max_syn_backlog = 3240000


# increase socket listen backlog
net.core.somaxconn = 3240000
net.ipv4.tcp_max_tw_buckets = 1440000


# Increase TCP buffer sizes
net.core.rmem_default = 8388608
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
net.ipv4.tcp_congestion_control = cubic

使用PHP-FPM的示例VHost配置

server {
    listen   80;

    server_name  www.example.com;

    location / {
        root   /data/sites/example.com/public_html;
        index  index.php index.html index.htm;

        try_files $uri $uri/ /index.php?rt=$uri&$args;
    }

   location ~ \.php {
      root          /data/sites/example.com/public_html;
      fastcgi_pass unix:/var/run/php-fpm/php-fpm.sock;
      fastcgi_param  SCRIPT_FILENAME $document_root$fastcgi_script_name;
      fastcgi_param  SCRIPT_NAME $fastcgi_script_name;
      fastcgi_index  index.php;
      fastcgi_param PATH_INFO $fastcgi_script_name;
      fastcgi_param ENV production;
      include        fastcgi_params;
    }
}

服务器可以处理大约60个活动的SBU连接，或者每秒约300个请求。事实是，没有充分利用RAM和更多的CPU是一件坏事吗？我可以进一步优化吗？

Nginx + PHP-FPM使用CPU而不是RAM

0 个答案: