ab测试 uwsgi遇到的问题
1 请求并发数目较大时，接收到的数目小于发送的数目
1.1
描述：uwsgi正常返回302跳转
ab -n 5000 -c 250 -g test.log "192.168.50.20:9033/Mapping.do?×××××××&as=1234567"
This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright 2006 The Apache Software Foundation, http://www.apache.org/
Benchmarking 192.168.50.20 (be patient)
Completed 500 requests
Completed 1000 requests
Completed 1500 requests
Completed 2000 requests
Completed 2500 requests
Completed 3000 requests
Completed 3500 requests
Completed 4000 requests
Completed 4500 requests
Finished 5000 requests
Server Software:
Server Hostname: 192.168.50.20
Server Port: 9033
Document Path: /Mapping.do?bfd_nid=behe&as=1234567
Document Length: 0 bytes
Concurrency Level: 250
Time taken for tests: 12.107652 seconds
Complete requests: 5000
Failed requests: 0
Write errors: 0
Non-2xx responses: 4990
Total transferred: 2095800 bytes
HTML transferred: 0 bytes
Requests per second: 412.96 [#/sec] (mean)
Time per request: 605.383 [ms] (mean)
Time per request: 2.422 [ms] (mean, across all concurrent requests)
Transfer rate: 168.98 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 1 42.5 0 3000
Processing: 18 466 1595.9 151 12083
Waiting: 0 446 1536.9 150 12083
Total: 18 467 1601.7 151 12106
Percentage of the requests served within a certain time (ms)
50% 151
66% 165
75% 198
80% 251
90% 389
95% 485
98% 9008
99% 12036
100% 12106 (longest request)
按照上边的结果所示，发送了5000个请求，4990个非2xx相应（Non-2xx responses: 4990）
而查看uwsgi.log发现也只接收到4990个请求。
1.2 只要降低并发就不会出现这样的问题
ab -n 50000 -c 100 -g test.log "192.168.50.20:9033/Mapping.do?bfd_nid=behe&as=1234567"
This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright 2006 The Apache Software Foundation, http://www.apache.org/
Benchmarking 192.168.50.20 (be patient)
Completed 5000 requests
Completed 10000 requests
Completed 15000 requests
Completed 20000 requests
Completed 25000 requests
Completed 30000 requests
Completed 35000 requests
Completed 40000 requests
Completed 45000 requests
Finished 50000 requests
Server Software:
Server Hostname: 192.168.50.20
Server Port: 9033
Document Path: /Mapping.do?bfd_nid=behe&as=1234567
Document Length: 0 bytes
Concurrency Level: 100
Time taken for tests: 85.735172 seconds
Complete requests: 50000
Failed requests: 0
Write errors: 0
Non-2xx responses: 50000
Total transferred: 21000000 bytes
HTML transferred: 0 bytes
Requests per second: 583.19 [#/sec] (mean)
Time per request: 171.470 [ms] (mean)
Time per request: 1.715 [ms] (mean, across all concurrent requests)
Transfer rate: 239.19 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 1.0 0 186
Processing: 4 170 123.1 136 1592
Waiting: 4 170 123.0 136 1592
Total: 4 170 123.1 136 1592
Percentage of the requests served within a certain time (ms)
50% 136
66% 148
75% 159
80% 169
90% 265
95% 403
98% 540
99% 650
100% 1592 (longest request)
1.3 调大listen参数解决问题。
当listen参数变大时，可以提高并发的数目。按道理增大processes数量和增大listen队列长度都可以增大并发能力。但是好像使用listen参数，效果比较显著。难道是后端处理速度太慢，需要缓存更多？
uwsgi.ini:
[uwsgi]
http=0.0.0.0:9033
master=true
pythonpath=../
module=api
processes=30
listen=512
daemonize=uwsgi.log
pidfile=uwsgi.pid
vacuum=true
harakiri=5
harakiri-verbose=true
buffer-size=16384
2
uwsgi.ini:
[uwsgi]
#http=192.168.40.11:9034
http=0.0.0.0:9034
master=true
pythonpath=../
module=breapi
processes=32
listen=512
daemonize=./logs/uwsgi.log
pidfile=uwsgi.pid
vacuum=true
harakiri=5
harakiri-verbose=true
buffer-size=16384
stats = $(HOSTNAME):1734
测试：
ab -n 30000 -c 1000 -g test.log "192.168.40.11:9034/Mapping.do?bfd_nid=behe&as=1234567"
This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright 2006 The Apache Software Foundation, http://www.apache.org/
Benchmarking 192.168.40.11 (be patient)
Completed 3000 requests
Completed 6000 requests
Completed 9000 requests
Completed 12000 requests
Completed 15000 requests
Completed 18000 requests
Completed 21000 requests
Completed 24000 requests
Completed 27000 requests
Finished 30000 requests
Server Software:
Server Hostname: 192.168.40.11
Server Port: 9034
Document Path: /Mapping.do?bfd_nid=behe&as=1234567
Document Length: 0 bytes
Concurrency Level: 1000
Time taken for tests: 12.411582 seconds
Complete requests: 30000
Failed requests: 0
Write errors: 0
Non-2xx responses: 29994
Total transferred: 12597480 bytes
HTML transferred: 0 bytes
Requests per second: 2417.10 [#/sec] (mean)
Time per request: 413.719 [ms] (mean)
Time per request: 0.414 [ms] (mean, across all concurrent requests)
Transfer rate: 991.17 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 4 99.8 0 3000
Processing: 43 299 983.0 126 9234
Waiting: 0 297 976.9 125 9234
Total: 50 304 993.5 126 12070
Percentage of the requests served within a certain time (ms)
50% 126
66% 129
75% 132
80% 134
90% 141
95% 616
98% 3222
99% 3632
100% 12070 (longest request)
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