测试方式
http_server 设置backlog为3，分别测试 3 并发访问和 4 并发访问，1000次request，对比如下：
比较
DragonOS
三并发成功，但有request处理的特别慢
ab -n 1000 -c 3 http://localhost:12580/
# ...
Document Path: /
Document Length: 75 bytes
Concurrency Level: 3
Time taken for tests: 10.020 seconds
Complete requests: 1000
Failed requests: 0
Non-2xx responses: 1000
Total transferred: 123000 bytes
HTML transferred: 75000 bytes
Requests per second: 99.80 [#/sec] (mean)
Time per request: 30.061 [ms] (mean)
Time per request: 10.020 [ms] (mean, across all concurrent requests)
Transfer rate: 11.99 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.0 0 0
Processing: 6 30 446.9 11 10012
Waiting: 6 30 446.8 11 10012
Total: 6 30 446.9 11 10012
Percentage of the requests served within a certain time (ms)
50% 11
66% 12
75% 12
80% 12
90% 12
95% 12
98% 12
99% 13
100% 10012 (longest request)
四并发失败
ab -n 1000 -c 4 http://localhost:12580/
# Output:
This is ApacheBench, Version 2.3 <$Revision: 1903618 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/
Benchmarking localhost (be patient)
Completed 100 requests
apr_socket_recv: Connection reset by peer (104)
Total of 102 requests completed
Linux
任何情况都很快，所有request都在1ms以内处理完毕。
ab -n 1000 -c 4 http://localhost:12581/
# Output
This is ApacheBench, Version 2.3 <$Revision: 1903618 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/
Benchmarking localhost (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:
Server Hostname: localhost
Server Port: 12581
Document Path: /
Document Length: 75 bytes
Concurrency Level: 4
Time taken for tests: 0.051 seconds
Complete requests: 1000
Failed requests: 0
Non-2xx responses: 1000
Total transferred: 123000 bytes
HTML transferred: 75000 bytes
Requests per second: 19471.54 [#/sec] (mean)
Time per request: 0.205 [ms] (mean)
Time per request: 0.051 [ms] (mean, across all concurrent requests)
Transfer rate: 2338.87 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.0 0 0
Processing: 0 0 0.1 0 1
Waiting: 0 0 0.1 0 1
Total: 0 0 0.1 0 1
Percentage of the requests served within a certain time (ms)
50% 0
66% 0
75% 0
80% 0
90% 0
95% 0
98% 0
99% 1
100% 1 (longest request)