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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