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  3. 对于最长交易和最短交易，nginx的响应时间不同
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对于最长交易和最短交易，nginx的响应时间不同

我运行这个nginx conf的testing： 

server { listen 80; #error_log /var/log/debug.log debug; server_name test1.ostrovok.ru; location / { fastcgi_pass 127.0.0.1:12345; client_max_body_size 20000k; charset utf8; } location /photos { proxy_pass http://imageserver; proxy_store /srv/trololo/$request_uri; proxy_store_access user:rw group:rw all:r; proxy_temp_path /srv/trololo/temp; access_log off; } } # Backend image server server { listen 12346; server_name localhost; location / { root /srv/trololo; sendfile off; aio on; output_buffers 200 10000k; gzip off; directio 512; access_log off; expires max; } } # Upstream upstream imageserver { server localhost:12346; }

testing： 

 siege -c 100 -r 5 -f urls.txt -t 120s --internet

结果 

 Transactions: 12352 hits Availability: 100.00 % Elapsed time: 120.00 secs Data transferred: 1591.91 MB Response time: 0.46 secs Transaction rate: 102.93 trans/sec Throughput: 13.27 MB/sec Concurrency: 47.13 Successful transactions: 12352 Failed transactions: 0 Longest transaction: 15.08 Shortest transaction: 0.05

为什么最长的交易和最短的交易之间的区别？

testing的前7秒 – 好： 

 HTTP/1.1 200 0.05 secs: 113575 bytes ==> /photos/resize/600/900/20110901/0300/22.png HTTP/1.1 200 0.06 secs: 16135 bytes ==> /photos/resize/900/100/20110831/2048/Ekafisha-Firefox.png HTTP/1.1 200 0.06 secs: 132249 bytes ==> /photos/resize/500/700/20110831/2048/Ekafisha-Firefox.png HTTP/1.1 200 0.05 secs: 8513 bytes ==> /photos/resize/100/300/20110831/2048/Ekafisha-Firefox.png HTTP/1.1 200 0.05 secs: 8513 bytes ==> /photos/resize/100/600/20110831/2048/Ekafisha-Firefox.png HTTP/1.1 200 0.06 secs: 113575 bytes ==> /photos/resize/600/900/20110901/0300/22.png HTTP/1.1 200 0.05 secs: 75669 bytes ==> /photos/resize/500/900/20110901/0300/22.png HTTP/1.1 200 0.05 secs: 113575 bytes ==> /photos/resize/600/1100/20110901/0300/22.png HTTP/1.1 200 0.05 secs: 29708 bytes ==> /photos/resize/300/500/20110901/0300/22.png HTTP/1.1 200 0.06 secs: 161191 bytes ==> /photos/resize/700/300/20110901/0300/22.png HTTP/1.1 200 0.06 secs: 200775 bytes ==> /photos/resize/800/700/20110901/0300/22.png HTTP/1.1 200 0.05 secs: 29708 bytes ==> /photos/resize/300/200/20110901/0300/22.png HTTP/1.1 200 0.05 secs: 29708 bytes ==> /photos/resize/300/1000/20110901/0300/22.png

但是之后： 

 HTTP/1.1 200 5.06 secs: 52441 bytes ==> /photos/resize/400/1100/20110901/0300/22.png HTTP/1.1 200 5.06 secs: 235335 bytes ==> /photos/resize/700/900/20110831/2048/Ekafisha-Firefox.png HTTP/1.1 200 5.07 secs: 305657 bytes ==> /photos/resize/1000/500/20110901/0300/22.png HTTP/1.1 200 5.07 secs: 252759 bytes ==> /photos/resize/900/1000/20110901/0300/22.png HTTP/1.1 200 5.07 secs: 200775 bytes ==> /photos/resize/800/700/20110901/0300/22.png HTTP/1.1 200 5.06 secs: 77258 bytes ==> /photos/resize/400/800/20110831/2048/Ekafisha-Firefox.png HTTP/1.1 200 0.06 secs: 376880 bytes ==> /photos/resize/1100/700/20110901/0300/22.png HTTP/1.1 200 0.05 secs: 16135 bytes ==> /photos/resize/900/100/20110831/2048/Ekafisha-Firefox.png HTTP/1.1 200 0.05 secs: 161191 bytes ==> /photos/resize/700/800/20110901/0300/22.png HTTP/1.1 200 0.05 secs: 16135 bytes ==> /photos/resize/700/100/20110831/2048/Ekafisha-Firefox.png HTTP/1.1 200 5.06 secs: 44446 bytes ==> /photos/resize/400/200/20110831/2048/Ekafisha-Firefox.png HTTP/1.1 200 0.06 secs: 343273 bytes ==> /photos/resize/900/800/20110831/2048/Ekafisha-Firefox.png HTTP/1.1 200 0.05 secs: 518488 bytes ==> /photos/resize/1100/800/20110831/2048/Ekafisha-Firefox.png HTTP/1.1 200 0.06 secs: 251162 bytes ==> /photos/resize/1100/300/20110901/0300/22.png HTTP/1.1 200 0.06 secs: 161191 bytes ==> /photos/resize/700/900/20110901/0300/22.png HTTP/1.1 200 0.06 secs: 16135 bytes ==> /photos/resize/300/100/20110831/2048/Ekafisha-Firefox.png HTTP/1.1 200 0.06 secs: 8513 bytes ==> /photos/resize/100/600/20110831/2048/Ekafisha-Firefox.png HTTP/1.1 200 0.05 secs: 3242 bytes ==> /photos/resize/100/300/20110901/0300/22.png HTTP/1.1 200 0.06 secs: 29708 bytes ==> /photos/resize/600/100/20110901/0300/22.png HTTP/1.1 200 0.06 secs: 24521 bytes ==> /photos/resize/200/1000/20110831/2048/Ekafisha-Firefox.png HTTP/1.1 200 0.06 secs: 29708 bytes ==> /photos/resize/300/900/20110901/0300/22.png HTTP/1.1 200 0.06 secs: 166648 bytes ==> /photos/resize/600/400/20110831/2048/Ekafisha-Firefox.png HTTP/1.1 200 0.05 secs: 52441 bytes ==> /photos/resize/400/500/20110901/0300/22.png HTTP/1.1 200 0.05 secs: 113652 bytes ==> /photos/resize/1000/400/20110831/2048/Ekafisha-Firefox.png HTTP/1.1 200 0.06 secs: 233737 bytes ==> /photos/resize/800/600/20110831/2048/Ekafisha-Firefox.png HTTP/1.1 200 0.05 secs: 113575 bytes ==> /photos/resize/600/500/20110901/0300/22.png HTTP/1.1 200 0.05 secs: 53067 bytes ==> /photos/resize/300/1100/20110831/2048/Ekafisha-Firefox.png HTTP/1.1 200 0.05 secs: 12417 bytes ==> /photos/resize/200/1100/20110901/0300/22.png HTTP/1.1 200 0.05 secs: 99703 bytes ==> /photos/resize/800/300/20110831/2048/Ekafisha-Firefox.png HTTP/1.1 200 0.06 secs: 252759 bytes ==> /photos/resize/900/700/20110901/0300/22.png HTTP/1.1 200 0.06 secs: 8513 bytes ==> /photos/resize/100/1000/20110831/2048/Ekafisha-Firefox.png HTTP/1.1 200 0.06 secs: 3242 bytes ==> /photos/resize/100/1000/20110901/0300/22.png HTTP/1.1 200 0.06 secs: 52441 bytes ==> /photos/resize/400/1100/20110901/0300/22.png HTTP/1.1 200 0.06 secs: 99703 bytes ==> /photos/resize/800/300/20110831/2048/Ekafisha-Firefox.png HTTP/1.1 200 0.06 secs: 376880 bytes ==> /photos/resize/1100/500/20110901/0300/22.png HTTP/1.1 200 0.05 secs: 161191 bytes ==> /photos/resize/700/1100/20110901/0300/22.png HTTP/1.1 200 0.05 secs: 24521 bytes ==> /photos/resize/200/1000/20110831/2048/Ekafisha-Firefox.png HTTP/1.1 200 0.06 secs: 251162 bytes ==> /photos/resize/1100/300/20110901/0300/22.png HTTP/1.1 200 0.06 secs: 305657 bytes ==> /photos/resize/1000/500/20110901/0300/22.png HTTP/1.1 200 0.06 secs: 518488 bytes ==> /photos/resize/1100/900/20110831/2048/Ekafisha-Firefox.png HTTP/1.1 200 0.08 secs: 113575 bytes ==> /photos/resize/600/1000/20110901/0300/22.png HTTP/1.1 200 5.06 secs: 166648 bytes ==> /photos/resize/600/700/20110831/2048/Ekafisha-Firefox.png HTTP/1.1 200 0.06 secs: 235335 bytes ==> /photos/resize/700/800/20110831/2048/Ekafisha-Firefox.png HTTP/1.1 200 0.05 secs: 235335 bytes ==> /photos/resize/700/700/20110831/2048/Ekafisha-Firefox.png HTTP/1.1 200 0.05 secs: 12417 bytes ==> /photos/resize/200/700/20110901/0300/22.png HTTP/1.1 200 0.05 secs: 16135 bytes ==> /photos/resize/1100/100/20110831/2048/Ekafisha-Firefox.png

[完整testing日志文件1

等等

为什么？

将静态请求代理/照片到同一个本地主机上的同一个nginx的目的是什么？ 如果您绝对需要它，最好不要在代理时将内容存储到磁盘，应将您的代理设置为完全透明模式（应将proxy_buffering设置为off ）。 否则，在您的设置中会出现无用的磁盘活动 – nginx会在您的/ photos位置的代理端创build临时文件。 这可能是某些请求性能下降的根本原因。