uwsgi性能调忧
摘要：调大uwsgi配置中 listen=1024的数目是提高并发能力最有效的办法。第二种方法是调大processes数目
发现总是超时报警
1 使用ab确定网络具体征况
[bre@dmp-1 ~]$ ab -n 1000 -c 100 http://.com/Mapping.do?
Concurrency Level: 100
Time taken for tests: 1.040 seconds
Complete requests: 1000
Failed requests: 0
Write errors: 0
Non-2xx responses: 1000
Total transferred: 486000 bytes
HTML transferred: 0 bytes
Requests per second: 961.42 [#/sec] (mean)
Time per request: 104.013 [ms] (mean)
Time per request: 1.040 [ms] (mean, across all concurrent requests)
Transfer rate: 456.30 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.4 0 2
Processing: 3 28 61.9 25 1005
Waiting: 3 28 61.9 25 1005
Total: 5 28 61.9 25 1006
Percentage of the requests served within a certain time (ms)
50% 25
66% 26
75% 26
80% 26
90% 27
95% 27
98% 29
99% 31
100% 1006 (longest request)
[bre@dmp-1 ~]$ ab -n 1000 -c 200 http://.com/Mapping.do?
Concurrency Level: 200
Time taken for tests: 3.022 seconds
Complete requests: 1000
Failed requests: 0
Write errors: 0
Non-2xx responses: 909
Total transferred: 463432 bytes
HTML transferred: 0 bytes
Requests per second: 330.91 [#/sec] (mean)
Time per request: 604.403 [ms] (mean)
Time per request: 3.022 [ms] (mean, across all concurrent requests)
Transfer rate: 149.76 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 1 1.2 0 4
Processing: 6 274 791.9 28 3015
Waiting: 6 274 791.9 28 3015
Total: 10 275 792.5 29 3018
Percentage of the requests served within a certain time (ms)
50% 29
66% 29
75% 30
80% 30
90% 43
95% 3015
98% 3015
99% 3016
100% 3018 (longest request)
[bre@dmp-1 ~]$ ab -n 1000 -c 300 http://.com/Mapping.do?
Concurrency Level: 300
Time taken for tests: 3.036 seconds
Complete requests: 1000
Failed requests: 0
Write errors: 0
Non-2xx responses: 811
Total transferred: 439128 bytes
HTML transferred: 0 bytes
Requests per second: 329.35 [#/sec] (mean)
Time per request: 910.892 [ms] (mean)
Time per request: 3.036 [ms] (mean, across all concurrent requests)
Transfer rate: 141.24 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 2 2.4 0 6
Processing: 5 521 1043.3 29 3027
Waiting: 5 521 1043.3 29 3027
Total: 10 523 1044.8 29 3032
Percentage of the requests served within a certain time (ms)
50% 29
66% 31
75% 35
80% 53
90% 3021
95% 3027
98% 3029
99% 3030
100% 3032 (longest request)
[bre@dmp-1 ~]$
[bre@dmp-1 ~]$ ab -n 1000 -c 400 http://.com/Mapping.do?
Concurrency Level: 400
Time taken for tests: 3.025 seconds
Complete requests: 1000
Failed requests: 0
Write errors: 0
Non-2xx responses: 711
Total transferred: 414328 bytes
HTML transferred: 0 bytes
Requests per second: 330.58 [#/sec] (mean)
Time per request: 1209.982 [ms] (mean)
Time per request: 3.025 [ms] (mean, across all concurrent requests)
Transfer rate: 133.76 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 3 3.7 0 9
Processing: 6 738 1148.8 28 3013
Waiting: 6 738 1148.8 28 3013
Total: 13 741 1151.3 28 3022
Percentage of the requests served within a certain time (ms)
50% 28
66% 38
75% 2011
80% 2016
90% 3013
95% 3016
98% 3019
99% 3019
100% 3022 (longest request)
[bre@dmp-1 ~]$ ab -n 1000 -c 500 http://cm.api.baifendian.com/Mapping.do?bfd_nid=behe
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/
Benchmarking cm.api.baifendian.com (be patient)
Completed 100 requests
Completed 200 requests
Completed 300 requests
Completed 400 requests
Completed 500 requests
Completed 600 requests
Completed 700 requests
Completed 800 requests
Completed 900 requests
Completed 1000 requests
Finished 1000 requests
Server Software: nginx/1.2.9
Server Hostname: cm.api.baifendian.com
Server Port: 80
Document Path: /Mapping.do?bfd_nid=behe
Document Length: 0 bytes
Concurrency Level: 500
Time taken for tests: 3.100 seconds
Complete requests: 1000
Failed requests: 0
Write errors: 0
Non-2xx responses: 610
Total transferred: 389280 bytes
HTML transferred: 0 bytes
Requests per second: 322.63 [#/sec] (mean)
Time per request: 1549.754 [ms] (mean)
Time per request: 3.100 [ms] (mean, across all concurrent requests)
Transfer rate: 122.65 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 5 4.7 9 10
Processing: 9 930 1168.2 31 3014
Waiting: 9 930 1168.2 31 3014
Total: 18 935 1171.1 33 3023
Percentage of the requests served within a certain time (ms)
50% 33
66% 2012
75% 2016
80% 2018
90% 3018
95% 3020
98% 3021
99% 3021
100% 3023 (longest request)
[bre@dmp-1 ~]$ ab -n 1000 -c 600 http://cm.api.baifendian.com/Mapping.do?bfd_nid=behe
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/
Benchmarking cm.api.baifendian.com (be patient)
Completed 100 requests
Completed 200 requests
Completed 300 requests
Completed 400 requests
Completed 500 requests
Completed 600 requests
Completed 700 requests
Completed 800 requests
Completed 900 requests
Completed 1000 requests
Finished 1000 requests
Server Software: nginx/1.2.9
Server Hostname: cm.api.baifendian.com
Server Port: 80
Document Path: /Mapping.do?bfd_nid=behe
Document Length: 0 bytes
Concurrency Level: 600
Time taken for tests: 3.039 seconds
Complete requests: 1000
Failed requests: 0
Write errors: 0
Non-2xx responses: 511
Total transferred: 364728 bytes
HTML transferred: 0 bytes
Requests per second: 329.08 [#/sec] (mean)
Time per request: 1823.243 [ms] (mean)
Time per request: 3.039 [ms] (mean, across all concurrent requests)
Transfer rate: 117.21 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 7 5.2 10 12
Processing: 9 1126 1170.6 45 3022
Waiting: 9 1126 1170.6 45 3022
Total: 21 1133 1173.4 55 3033
Percentage of the requests served within a certain time (ms)
50% 55
66% 2014
75% 2017
80% 2019
90% 3019
95% 3025
98% 3028
99% 3031
100% 3033 (longest request)
可以看到，每秒处理请求数目极限大约是300，随着并发数目的增大，性能开始下降。
现在的请求每天1000000条，那么高峰时段的请求次数为：1000000/（8*60*60）*10 = 347 （次每秒）
每天正常请求时段是8小时，高峰时段请求频次是平均的8～10倍。
所以只是勉强够用而已，还需要提高速度（优化整个程序流程或者增大并发进程）。
2 使用 uwsgitop 查看是前端（nginx）还是后端（uwsgi和后续处理流程）
观察结果
uwsgi-1.9.14 - Mon Feb 10 16:17:16 2014 - req: 188802 - lq: 0 - tx: 66.0M node: dmp-1 - cwd: /opt/bre/CookieMapping/dsWebService - uid: 508 - gid: 503 - masterpid: 25062
WID % PID REQ EXC SIG STATUS AVG RSS VSZ TX RunT
7 41.4 25073 78127 0 0 idle 1ms 0 0 25.0M 217637
5 10.0 25071 18956 0 0 idle 1ms 0 0 6.0M 105123
8 9.1 25076 17213 0 0 idle 1ms 0 0 6.0M 101432
4 9.1 25070 17196 0 0 idle 1ms 0 0 6.0M 99265
6 9.0 25072 17032 0 0 idle 1ms 0 0 6.0M 95653
2 7.6 25068 14312 0 0 idle 1ms 0 0 5.0M 93229
1 7.1 25067 13489 0 0 idle 17ms 0 0 5.0M 85652
3 6.6 25069 12477 0 0 idle 2ms 0 0 4.0M 91285
发现当使用ab测试时，当并发比较大时候，时间会出现很大的情况
3 措施
（1）首先，uwsgi观察到上面的负载不均衡，第7个线程负责的请求数远大于其他的。
调整使之均衡
（2）再机器能力足够的情况下，增加线程数目
（3）建立uwsgi集群，在另外一台机器上也部署此服务，并让nginx转发部分到此
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