<"color: #ff0000">demo.php



<"htmlcode">

0
1
11
1
0




2.并发调用计数器，检查计数唯一性
测试代码如下：


<"color: #ff0000">ab工具进行测试，设置执行150次，15个并发。



ab -c 15 -n 150 http://localhost/test.php




执行结果：


ab -c 15 -n 150 http://localhost/test.php
This is ApacheBench, Version 2.3 <$Revision: 1554214 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/
Benchmarking home.rabbit.km.com (be patient).....done
Server Software:    nginx/1.6.3
Server Hostname:    localhost
Server Port:      80
Document Path:     /test.php
Document Length:    0 bytes
Concurrency Level:   15
Time taken for tests:  0.173 seconds
Complete requests:   150
Failed requests:    0
Total transferred:   24150 bytes
HTML transferred:    0 bytes
Requests per second:  864.86 [#/sec] (mean)
Time per request:    17.344 [ms] (mean)
Time per request:    1.156 [ms] (mean, across all concurrent requests)
Transfer rate:     135.98 [Kbytes/sec] received
Connection Times (ms)
       min mean[+/-sd] median  max
Connect:    0  0  0.2   0    1
Processing:   3  16  3.2   16   23
Waiting:    3  16  3.2   16   23
Total:     4  16  3.1   17   23
Percentage of the requests served within a certain time (ms)
 50%   17
 66%   18
 75%   18
 80%   19
 90%   20
 95%   21
 98%   22
 99%   22
 100%   23 (longest request)




检查计数是否唯一


生成的总计数

wc -l /tmp/mytest_result.log
   150 /tmp/mytest_result.log

生成的唯一计数

sort -u /tmp/mytest_result.log | wc -l
   150




可以看到在并发调用的情况下，生成的计数也保证唯一。
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