系統層優化
系統 socket 層優化
echo 65535 > /proc/sys/net/core/somaxconn 准許最大鏈結數
echo 1 > /proc/sys/net/ipv4/tcp_tw_recycle 快速**鏈結
echo 1 > /proc/sys/net/ipv4/tcp_tw_reuse 重用鏈結
echo 0 > /proc/sys/net/ipv4/tcp_syncookies 關閉洪水抵禦
系統檔案層優化
ulimit -n 65535
nginx 配置層優化
nginx socket層優化
worker_connections 10240;
nginx 層開啟檔案數優化
worker_rlimit_nofile 20000;
ab -n 500000 -c 20000
server software: nginx/1.10.2
server hostname: 192.168.1.52
server port: 80
document path: /index.html
document length: 3698 bytes
concurrency level: 10000
time taken for tests: 50.253 seconds
complete requests: 500000
failed requests: 0
write errors: 0
total transferred: 1986528972 bytes
html transferred: 1868307258 bytes
requests per second: 9949.62 [#/sec] (mean)
time per request: 1005.064 [ms] (mean)
time per request: 0.101 [ms] (mean, across all concurrent requests)
transfer rate: 38603.91 [kbytes/sec] received
connection times (ms)
min mean[+/-sd] median max
connect: 0 450 101.8 448 1408
processing: 153 543 199.3 510 2093
waiting: 0 400 181.5 361 2016
total: 475 993 173.4 971 2382
percentage of the requests served within a certain time (ms)
50% 971
66% 997
75% 1015
80% 1030
90% 1086
95% 1156
98% 1540
99% 1922
100% 2382 (longest request)
硬體配置 vm i5 4核 1g記憶體
nginx高併發配置
nginx配置及說明 worker processes 8 nginx 程序數，建議按照cpu 數目來指定，一般為它的倍數。worker cpu affinity 00000001 00000010 00000100 00001000 00010000 00100000 01000000 10000...
nginx高併發配置
nginx配置及說明 worker processes 8 nginx 程序數，建議按照cpu 數目來指定，一般為它的倍數。worker cpu affinity 00000001 00000010 00000100 00001000 00010000 00100000 01000000 10000...
高併發配置
其實，對於 nginx tomcat 等這種 web 伺服器，都提供了 backlog 引數設定入口，當然它們都會有預設值，通常這個預設值都不會太大 包括核心預設的半連線佇列和全連線佇列長度 如果應用併發訪問非常高，只增大應用層 backlog 是沒有意義的，因為可能核心引數關於連線佇列設定的都很小...