使用ab测试时候遇到apr_socket_connect; 由于系统缓冲区空间不足或者队列已满，不能执行套接字上的操作

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使用ab测试时候遇到apr_socket_connect; 由于系统缓冲区空间不足或者队列已满，不能执行套接字上的操作10

ab测试请求的压力上限是，测试请求对数据库执行的操作包括更新插入等操作
当超过1000000的总请求数时，报apr_socket_connect; 由于系统缓冲区空间不足或者队列已满，不能执行套接字上的操作
http://www.iteye.com/topic/190329?page=6也有遇到同样问题

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 localhost (be patient)

Server Software:        Apache-Coyote/1.1
Server Hostname:        localhost
Server Port:            8082

Document Path:          /manage/purchase/save
Document Length:        244 bytes

Concurrency Level:      1000
Time taken for tests:   63.716 seconds
Complete requests:      10000
Failed requests:        0
Write errors:           0
Total transferred:      4570000 bytes
Total POSTed:           9820000
HTML transferred:       2440000 bytes
Requests per second:    156.95 [#/sec] (mean)
Time per request:       6371.600 [ms] (mean)
Time per request:       6.372 [ms] (mean, across all concurrent requests)
Transfer rate:          70.04 [Kbytes/sec] received
                        150.51 kb/s sent
                        220.55 kb/s total

Connection Times (ms)
              min mean[+/-sd] median   max
Connect:        0    6 53.5      0     593
Processing:   603 5934 1123.3   6135   10106
Waiting:      601 3828 1546.3   3760   10096
Total:        603 5940 1123.3   6137   10106

Percentage of the requests served within a certain time (ms)
50%   6137
66%   6204
75%   6277
80%   6592
90%   6773
95%   6833
98%   7298
99%   7637
100% 10106 (longest request)

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