LAF后端性能测试（ab）
LAF后端性能测试
1)首页第一页加载:
并发量50
Document Path: /service/api/v1/item?page=0
Document Length: 2965 bytes
Concurrency Level: 50
Complete requests: 1000
Failed requests: 2
Requests per second: 11.30[#/sec] (mean)
Time per request: 4425.834[ms] (mean)
Transfer rate: 34.41[Kbytes/sec] received
Percentage of the requests served within a certain time (ms)
50% 1254
75% 2482
80% 3304
100% 60823(longest request)
并发量：60
Document Path: /service/api/v1/item?page=0
Document Length: 2965 bytes
Concurrency Level: 60
Complete requests: 1000
Failed requests: 7
Requests per second: 13.58[#/sec] (mean)
Time per request: 4417.343[ms] (mean)
Transfer rate: 41.16[Kbytes/sec] received
Percentage of the requests served within a certain time (ms)
50% 1460
75% 3308
80% 3934
100% 73620(longest request)
2) 图片加载速度
DocumentPath: /service/static/uploads/admin/default_avatar.jpg
Document Length: 12391 bytes
Concurrency Level: 50
Complete requests: 1000
Failed requests: 19
Requests per second: 6.87[#/sec] (mean)
Time per request: 7282.662[ms] (mean)
Transfer rate: 82.52[Kbytes/sec] received
(带宽为1Mbps, 理想传输速率为125 Kbytes/sec，这时候带宽已经[快]成为瓶颈)
Percentage of the requests served within a certain time (ms)
50% 2692
66% 4120
75% 5142
80% 6370
100% 86614(longest request)
这个图片还是比较小的图片，才12KB，一般来说是20+KB, 如果是手机里的原图，压缩后一般在120+KB，预计可能达上MB。
并发量20
Docum Path: /service/static/uploads/admin/default_avatar.jpg
Document Length: 12391 bytes
Concurrency Level: 20
Complete requests: 500
Requests per second: 6.66[#/sec] (mean)
Time per request: 3004.820[ms] (mean)
Transfer rate: 81.55[Kbytes/sec] received
Percentage of the requests served within a certain time (ms)
50% 1652
80% 3987
100% 30340(longest request)
访问图片并发量 30
Path: /service/static/uploads/admin/default_avatar.jpg
Document Length: 12391 bytes
Concurrency Level: 30
Complete requests: 500
Failed requests: 5
Requests per second: 6.87[#/sec] (mean)
Time per request: 4366.394[ms] (mean)
Transfer rate: 83.34[Kbytes/sec] received
Percentage of the requests served within a certain time (ms)
50% 2096
66% 2949
75% 3970
80% 4732
100% 66365 (longest request)
可见，图片访问的并发量在20到30之间可勉强接受。而且图片访问的吞吐率好底阿，6.x requests/sec
并发需求估计：
一、经典公式
1）平均并发用户数为 C = nL/T
2）并发用户数峰值 C‘ = C + 3*根号C
C是平均并发用户数，n是login session的数量，L是login session的平均长度，T是值考察的时间长度 C’是并发用户数峰值
假设用户在线数100，平均访问时长5分钟，即1/12小时。则平均并发用户数为：100*1/12*8 = 8.x; 峰值为 8 + 3*2 = 14。首页满足要求，发布页面待测试
二、根据系统用户数计算
并发用户数 = 系统最大在线用户数的8%到12%
假设最大在线用户数为1000，则并发量达100。暂时达不到。(升级带宽至4M后可达到)
高峰期所需的带宽估算:
公式：并发数 * 为每个连接提供的带宽
根据测试，平均带宽为40Kbytes/sec
如果并发数为100，则带宽要求为： 100 * 40KB/1024KB = 4Mbps
###总结：首页访问并发量 50， 图片访问并发量 20 ~ 30。显然太低。优化思路： 1. 图片资源改由nginx处理，不在走uwsgi 处理。2.提高吞吐率，目前不清楚怎么提高(可能要提升服务器配置，修改nginx及系统的配置选项等)。 3. 提高带宽(4M)。
带宽提高到4M后：
首页第一页，并发量50：
TLS Server Name: ikebo.cn
Document Path: /service/api/v1/item?page=0
Document Length: 2916 bytes
Concurrency Level: 50
Complete requests: 1000
Requests per second: 35.04[#/sec] (mean)
Time per request: 1426.972[ms] (mean)
Time per request: 28.539[ms] (mean, across all concurrent requests)
Transfer rate: 105.25[Kbytes/sec] received
Percentage of the requests served within a certain time (ms)
80% 1385
100% 1583(longest request)
并发量 100：
TLS Server Name: ikebo.cn
Document Path: /service/api/v1/item?page=0
Document Length: 2916 bytes
Concurrency Level: 100
Complete requests: 1000
Failed requests: 1
Requests per second: 20.22[#/sec] (mean)
Time per request: 4945.459[ms] (mean)
Transfer rate: 60.74[Kbytes/sec] received
Percentage of the requests served within a certain time (ms)
80% 2718
100% 23745 (longest request)
图片加载 并发量50：
TLS Server Name: ikebo.cn
Document Path: /static/uploads/admin/default_avatar.jpg
Document Length: 12391 bytes
Concurrency Level: 50
Complete requests: 1000
Failed requests: 2
Requests per second: 13.37[#/sec] (mean)
Time per request: 3741.087[ms] (mean)
Transfer rate: 164.94[Kbytes/sec] received
Percentage of the requests served within a certain time (ms)
80% 2271
100% 22666 (longest request)
可见，带宽从1M升级到4M之后，性能显著提升，首页加载从原来的50~60提升到100+， 图片加载速度从原来的20~30提升到50+