短板是帶寬
我當(dāng)時(shí)目標(biāo)很簡(jiǎn)單，如果我的網(wǎng)站能支撐1萬(wàn)個(gè)并發(fā) 在一分鐘內(nèi)處理完 就謝天謝地了。
經(jīng)過(guò)一輪的折騰之后，我得出的經(jīng)驗(yàn)是，上萬(wàn)的并發(fā)是有錢人的游戲，窮屌絲們只能在區(qū)域網(wǎng)里感嘆一下
因?yàn)?，木桶原理，短板在帶寬上，最燒錢的也是帶寬
假設(shè)站點(diǎn)的帶寬是4Mbit/s 請(qǐng)求的頁(yè)面大小是40kb，那么每秒只能處理的12個(gè)連接，一萬(wàn)個(gè)連接 要14分鐘
每秒僅處理12個(gè)連接。。。 你還對(duì)內(nèi)存有要求？ 還是對(duì)CPU 有要求? 還是硬盤的讀寫速度跟不上了？還在乎用nginx還是apache？
Nginx 還是 Apache
大家都說(shuō)nginx 在并發(fā)上多么多么的有優(yōu)勢(shì)，如果網(wǎng)站并發(fā)不超過(guò)2萬(wàn)，親測(cè)Apache都稍優(yōu)于Nginx 再大我沒(méi)有測(cè)試過(guò)，所以我現(xiàn)在很是后悔以前跟風(fēng)吹噓nginx好，epoll好。。。。
我在阿里云一個(gè)8G 4核 （Intel Xeon E5-2682v4 / Intel Xeon(Skylake) Platinum 8163 2.5 GHz）的服務(wù)器 同時(shí)搭建了Apache和Nginx環(huán)境 使用ab命令測(cè)試的
nginx 10000次381秒
Server Software:? ? ? ? nginx/1.12.2
Document Length:? ? ? ? 39281 bytes
Concurrency Level:? ? ? 10000
Time taken for tests:? 381.031 seconds
Complete requests:? ? ? 10000
Failed requests:? ? ? ? 0
Total transferred:? ? ? 395170000 bytes
HTML transferred:? ? ? 392810000 bytes
Requests per second:? ? 26.24 [#/sec] (mean)
Time per request:? ? ? 381030.615 [ms] (mean)
Time per request:? ? ? 38.103 [ms] (mean, across all concurrent requests)
Transfer rate:? ? ? ? ? 1012.80 [Kbytes/sec] received
Connection Times (ms)
? ? ? ? ? ? ? min? mean[+/-sd] median? max
Connect:? ? ? 26? 38? 24.2? ? 36? ? 1444
Processing:? 2114 192241 109289.0 193797? 380294
Waiting:? ? ? 28 190667 109446.4 192221? 378970
Total:? ? ? 2150 192279 109288.6 193832? 380321
Percentage of the requests served within a certain time (ms)
? 50%? 193832
? 66%? 252949
? 75%? 286462
? 80%? 304815
? 90%? 342882
? 95%? 362196
? 98%? 373041
? 99%? 376604
100%? 380321 (longest request)
Apache 10000次370秒
Server Software:? ? ? ? Apache/2.4.6
Document Length:? ? ? ? 39281 bytes
Concurrency Level:? ? ? 10000
Time taken for tests:? 369.933 seconds
Complete requests:? ? ? 10000
Failed requests:? ? ? ? 0
Total transferred:? ? ? 395460000 bytes
HTML transferred:? ? ? 392810000 bytes
Requests per second:? ? 27.03 [#/sec] (mean)
Time per request:? ? ? 369933.405 [ms] (mean)
Time per request:? ? ? 36.993 [ms] (mean, across all concurrent requests)
Transfer rate:? ? ? ? ? 1043.95 [Kbytes/sec] received
Connection Times (ms)
? ? ? ? ? ? ? min? mean[+/-sd] median? max
Connect:? ? ? 26? 36? 21.5? ? 36? ? 1436
Processing:? 2168 184588 105904.3 183677? 369183
Waiting:? ? ? 28 182993 106063.1 182085? 367833
Total:? ? ? 2204 184624 105904.7 183715? 369213
Percentage of the requests served within a certain time (ms)
? 50%? 183715
? 66%? 242029
? 75%? 274513
? 80%? 292806
? 90%? 333280
? 95%? 351313
? 98%? 362069
? 99%? 365738
100%? 369213 (longest request)
這數(shù)據(jù) 簡(jiǎn)直難以啟齒，沒(méi)錯(cuò) 我發(fā)現(xiàn)帶寬只有8M
那么高潮來(lái)了 我在阿里云的同區(qū)域網(wǎng)租了一臺(tái)服務(wù)器 同樣的環(huán)境 變成區(qū)域網(wǎng)內(nèi)測(cè)試了
Apache 20000 11秒 (1萬(wàn)的并發(fā)都不好意思來(lái)測(cè)試了)
Server Software:? ? ? ? Apache/2.4.6
Document Length:? ? ? ? 39281 bytes
Concurrency Level:? ? ? 20000
Time taken for tests:? 11.584 seconds
Complete requests:? ? ? 20000
Failed requests:? ? ? ? 0
Write errors:? ? ? ? ? 0
Total transferred:? ? ? 790920000 bytes
HTML transferred:? ? ? 785620000 bytes
Requests per second:? ? 1726.48 [#/sec] (mean)
Time per request:? ? ? 11584.234 [ms] (mean)
Time per request:? ? ? 0.579 [ms] (mean, across all concurrent requests)
Transfer rate:? ? ? ? ? 66675.35 [Kbytes/sec] received
Connection Times (ms)
? ? ? ? ? ? ? min? mean[+/-sd] median? max
Connect:? ? ? ? 0? 280 615.8? ? ? 0? ? 4567
Processing:? ? 0? 239 429.5? ? 155? ? 8174
Waiting:? ? ? ? 0? 149 254.0? ? 145? ? 8173
Total:? ? ? ? ? 1? 519 838.9? ? 164? 10153
Percentage of the requests served within a certain time (ms)
? 50%? ? 164
? 66%? ? 320
? 75%? ? 580
? 80%? 1110
? 90%? 1285
? 95%? 1928
? 98%? 3175
? 99%? 3879
100%? 10153 (longest request)
nginx 20000 11秒
Server Software:? ? ? ? nginx/1.12.2
Document Length:? ? ? ? 39281 bytes
Concurrency Level:? ? ? 20000
Time taken for tests:? 11.336 seconds
Complete requests:? ? ? 20000
Failed requests:? ? ? ? 0
Write errors:? ? ? ? ? 0
Total transferred:? ? ? 790340000 bytes
HTML transferred:? ? ? 785620000 bytes
Requests per second:? ? 1764.22 [#/sec] (mean)
Time per request:? ? ? 11336.451 [ms] (mean)
Time per request:? ? ? 0.567 [ms] (mean, across all concurrent requests)
Transfer rate:? ? ? ? ? 68082.72 [Kbytes/sec] received
Connection Times (ms)
? ? ? ? ? ? ? min? mean[+/-sd] median? max
Connect:? ? ? ? 0? 516? 34.8? ? 516? ? 574
Processing:? 572 3190 1618.7? 3463? 10669
Waiting:? ? ? ? 0? 754 906.9? ? 475? ? 6658
Total:? ? ? 1039 3705 1626.3? 4002? 11237
Percentage of the requests served within a certain time (ms)
? 50%? 4002
? 66%? 4622
? 75%? 4964
? 80%? 5134
? 90%? 5436
? 95%? 5849
? 98%? 6860
? 99%? 7325
100%? 11237 (longest request)
