1.服务器配置以支持并发。
1.1设置服务器配置。
vim /etc/security/limits.conf #最后面添加
* soft nofile 65535
* hard nofile 65535
vim /etc/profile #最后面添加
ulimit -s 102400
ulimit -n 102400
vim /etc/sysctl.conf #最后面添加
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
net.ipv4.neigh.default.gc_stale_time=120
# see details in https://help.aliyun.com/knowledge_detail/39428.html
net.ipv4.conf.all.rp_filter=0
net.ipv4.conf.default.rp_filter=0
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.lo.arp_announce=2
net.ipv4.conf.all.arp_announce=2
# # see details in https://help.aliyun.com/knowledge_detail/41334.html
kernel.sysrq = 1
fs.file-max = 6553560
net.ipv4.ip_forward = 1
net.ipv4.tcp_fin_timeout = 30
net.ipv4.tcp_max_syn_backlog = 10240
net.ipv4.tcp_keepalive_time = 1200
net.ipv4.tcp_synack_retries = 3
net.ipv4.tcp_syn_retries = 3
net.ipv4.tcp_max_orphans = 102400
net.ipv4.tcp_max_tw_buckets = 5000
net.ipv4.tcp_window_scaling = 0
net.ipv4.tcp_sack = 0
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_syncookies = 1
#打开重用（主要）
net.ipv4.tcp_tw_reuse = 1
#打开快速回收（主要）
net.ipv4.tcp_tw_recycle = 1
#可使用端口范围(主要)
net.ipv4.ip_local_port_range = 1024 65000
执行使生效
sysctl -p
另外配置参考地址
https://cloud.tencent.com/developer/article/1181929
https://www.louxiaohui.com/2020/02/12/nginx-failed-24-Too-many-oppen-files/
https://cloud.tencent.com/document/product/457/48142
2.nginx代理k8s等代理会影响吞吐量。
nginx配置如下
当超时时
优化文档：http://mailman.nginx.org/pipermail/nginx/2019-June/058036.html
#user nobody;
#worker_processes 2;
#error_log logs/error.log;
#error_log logs/error.log notice;
#error_log logs/error.log info;
#pid logs/nginx.pid;
worker_processes 4;
worker_cpu_affinity 00000001 00000010 00000100 00001000;
worker_rlimit_nofile 30000;
events {
use epoll;
worker_connections 50000;
}
http {
include 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 logs/access.log main;
sendfile on;
#tcp_nopush on;
#keepalive_timeout 0;
keepalive_timeout 30;
#gzip on;
#高并发配置设置
#client_header_buffer_size 1k; #默认请求包头信息的缓存
#large_client_header_buffers 4 4k; #大请求包头部信息的缓存个数与容量
proxy_set_header Connection "";
proxy_http_version 1.1;
server {
listen 7777;
server_name localhost;
#charset koi8-r;
#access_log logs/host.access.log main;
location /httpSocsp/ {
#proxy_set_header X-Real-IP $remote_addr;
#proxy_set_header Host $http_host;
#proxy_http_version 1.1;
#proxy_set_header Connection "";
#proxy_connect_timeout 159s;
#proxy_send_timeout 600;
#proxy_read_timeout 600;
#proxy_buffer_size 64k;
#proxy_buffers 16 32k;
#proxy_busy_buffers_size 64k;
#proxy_temp_file_write_size 64k;
#proxy_pass_header Set-Cookie;
#proxy_redirect off;
#proxy_hide_header Vary;
#proxy_set_header Accept-Encoding '';
#proxy_ignore_headers Cache-Control Expires;
#proxy_set_header Referer $http_referer;
#proxy_set_header Host $host;
#proxy_set_header Cookie $http_cookie;
#proxy_set_header X-Real-IP $remote_addr;
#proxy_set_header X-Forwarded-Host $host;
#proxy_set_header X-Forwarded-Server $host;
#proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_connect_timeout 4000;
proxy_send_timeout 4000;
fastcgi_send_timeout 4000;
fastcgi_read_timeout 4000;
proxy_pass http://192.168.0.199:30195/ocsp/;
}
location / {
root html;
index index.html index.htm;
}
#error_page 404 /404.html;
# redirect server error pages to the static page /50x.html
#
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
# proxy the PHP scripts to Apache listening on 127.0.0.1:80
#
#location ~ \.php$ {
# proxy_pass http://127.0.0.1;
#}
# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
#
#location ~ \.php$ {
# root html;
# fastcgi_pass 127.0.0.1:9000;
# fastcgi_index index.php;
# fastcgi_param SCRIPT_FILENAME /scripts$fastcgi_script_name;
# include fastcgi_params;
#}
# deny access to .htaccess files, if Apache's document root
# concurs with nginx's one
#
#location ~ /\.ht {
# deny all;
#}
}
# another virtual host using mix of IP-, name-, and port-based configuration
#
#server {
# listen 8000;
# listen somename:8080;
# server_name somename alias another.alias;
# location / {
# root html;
# index index.html index.htm;
# }
#}
# HTTPS server
#
#server {
# listen 443 ssl;
# server_name localhost;
# ssl_certificate cert.pem;
# ssl_certificate_key cert.key;
# ssl_session_cache shared:SSL:1m;
# ssl_session_timeout 5m;
# ssl_ciphers HIGH:!aNULL:!MD5;
# ssl_prefer_server_ciphers on;
# location / {
# root html;
# index index.html index.htm;
# }
#}
}
3.springboot日志优化（关闭控制台日志可以很大程度提高并发吞吐量）
4.配置是否合理（redis、mysql等） 与gpu相关，如多少核应该配置多少线程数。
5.使用redis存放热数据的时候，只会在一定情况下提高效率。
6.socket万级并发的时候，tcp交互问题解决，服务端（TIME_WAIT）过多。
方案一、 java关闭连接时候使用setSoLinger
1、setSoLinger(true, 0)，表示不管当前有没有还未发送给对方的数据就直接关闭链接。
2、setSoLinger(true, 1)，表示等待1秒如果还有未发送给对方的数据也直接关闭链接。
3、setSoLinger(false, -1)，表示无论如何都等未发送给对方的数据发送完毕才按照4次挥手的过程正常关闭链接。
实战优化
windows使用JMeter时候系统设置
1.以Administrator用户登录Windows操作系统。
2.修改TCP回收时间。
1.在Windows开始菜单中，单击“运行”。
2.在“运行”对话框中，输入“regedit”后按“Enter”打开注册表编辑器。
3.在“注册表编辑器”中打开“HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters”路径。
4.在“编辑”菜单中，选择“新建 > DWORD （32-位）值”，输入名称“TcpTimedWaitDelay”。
5.右键单击TcpTimedWaitDelay，选择“修改”。
6.在“编辑 DWORD（32位）值”对话框的“基数”区域中，选择十进制值为“30”，并“确定”。
7.关闭注册表编辑器。
3.修改端口范围。
1.在Windows开始菜单中，单击“运行”。
2.输入“cmd”并按“Enter”打开命令执行窗口。
3.执行如下命令修改端口范围。
4.netsh int ipv4 set dynamicportrange tcp startport=5000 numberofports=60000
4.重启操作系统。
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