因为测试时间不是严格相等，所以主要看平均：时间分布，ab普遍低一些。双方测试环境和测试参数都一致，不知道是不是jmeter在计算返回时间上算法不一样。平均时间，jmeter统计口径也是偏高
我留了个心眼，查询了web接口后台日志，确保了两次测试的传参是一样的，那么结果的差别只能理解为两个软件在统计口径（比如返回时件的测量标准上），以及http访问方式上有差别( 比如同样是设置10个并发，一般是理解为开10个线程去不断的请求接口，但线程的调度策略不一样，对服务器的压力不一样，返回的性能也不一样）。
GET测试对比完 ， 再来对比一下POST API测试的效果：
【ab】：
#ab -t 100 -c 10 -p post_data.txt -T 'application/json' :8083/xxxxx
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd,
Licensed to The Apache Software Foundation,
Benchmarking xxx.xxx.xxx.xxx (be patient)
Completed 5000 requests
Completed 10000 requests
Finished 12937 requests
Server Software: CppCMS-Embedded/1.0.4
Server Hostname: xxx.xxx.xxx.xxx
Server Port: 8083
Document Path: /xxxxx
Document Length: 92 bytes
Concurrency Level: 10
Time taken for tests: 100.001 seconds
Complete requests: 12937
Failed requests: 0
Write errors: 0
Total transferred: 2962573 bytes
Total POSTed: 4828858
HTML transferred: 1190204 bytes
Requests per second: 129.37 [#/sec] (mean)
Time per request: 77.299 [ms] (mean)
Time per request: 7.730 [ms] (mean, across all concurrent requests)
Transfer rate: 28.93 [Kbytes/sec] received
47.16 kb/s sent
76.09 kb/s total
Connection Times (ms)
min mean[+/-sd] median max
Connect: 1 2 8.9 1 1001
Processing: 31 76 78.5 69 2452
Waiting: 31 75 77.7 69 2452
Total: 33 77 79.0 71 2454
Percentage of the requests served within a certain time (ms)
50% 71
66% 80
75% 88
80% 91
90% 101
95% 113
98% 124
99% 140
100% 2454 (longest request)
【jmeter】
而同样参数配置的jmeter的结果为：
#../apache-jmeter-2.11/bin/jmeter -n -t post.jmx -JCSV=post_paras.txt -JIP=xxx.xxx.xxx.xxx -JPORT=8083 -JTHREAD=10 -JRAMP=1 -l "post_test.log"
Creating summariser <summary>
Created the tree successfully using post_to_recommend_user_action_server.jmx
Starting the test @ Tue Nov 17 20:49:37 CST 2015 (1447764577991)
Waiting for possible shutdown message on port 4445
summary + 3978 in 21.1s = 188.5/s Avg: 51 Min: 32 Max: 1049 Err: 0 (0.00%) Active: 10 Started: 10 Finished: 0
summary + 3796 in 30.1s = 126.2/s Avg: 78 Min: 34 Max: 1596 Err: 0 (0.00%) Active: 10 Started: 10 Finished: 0
summary = 7774 in 51.1s = 152.1/s Avg: 64 Min: 32 Max: 1596 Err: 0 (0.00%)
summary + 3273 in 30.1s = 108.8/s Avg: 91 Min: 37 Max: 3091 Err: 1 (0.03%) Active: 10 Started: 10 Finished: 0
summary = 11047 in 81.1s = 136.2/s Avg: 72 Min: 32 Max: 3091 Err: 1 (0.01%)
对post_test.log进行聚合报告分析
samples: 11899
average: 58
median: 52
90% line: 76
min: 27
max: 3091
error: 0.01%
throughout: 7.6/sec
kb/sec: 1.9
post api 压测结果对比
ab jmeter完成请求数 12937 11899
平均返回时间（ms） 77 58
最大返回时间（ms） 3091
最小返回时间（ms） 27
请求时间中位数(50%<) 71 52
90%的请求反水时间低于（ms） 101 76
错误率（基本是超时） 0 0.01%
QPS 129 136
【使用对比总结】
个人体会是：