nodejs测试： buffer跟字符串相加对比测试-JavaSript-爱易网页

nodejs测试： buffer跟字符串相加对比测试

日期：2014-05-16　浏览次数：20469 次

nodejs测试： buffer和字符串相加对比测试

看到jsconf2010.pdf写的关于buffer对象和string字符串相加的对比图表。发现buffer对象响应的变化很大，眼见为实，因此证实一下：

准备：

apache ab模拟并发，编写两份代码

os: debian 6.0

cpu: Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz

mem: 4G

代码：

说明：定义两个监听，实现不同的字符串拼接，并监听不同的端口，方便测试。

运行：

/usr/mytools/httpd/bin/ab -c 300 -n 10000 http://127.0.0.1:1339 <pre name="code" class="html">/usr/mytools/httpd/bin/ab -c 300 -n 10000 http://127.0.0.1:1340</pre>

结果：

madding@wmmad:~$ /usr/mytools/httpd/bin/ab -c 300 -n 10000 http://127.0.0.1:1339/ This is ApacheBench, Version 2.3 <$Revision: 655654 {1}gt; Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/ Licensed to The Apache Software Foundation, http://www.apache.org/ Benchmarking 127.0.0.1 (be patient) Completed 1000 requests Completed 2000 requests Completed 3000 requests Completed 4000 requests Completed 5000 requests Completed 6000 requests Completed 7000 requests Completed 8000 requests Completed 9000 requests Completed 10000 requests Finished 10000 requests Server Software: Server Hostname: 127.0.0.1 Server Port: 1339 Document Path: / Document Length: 16384 bytes Concurrency Level: 300 Time taken for tests: 3.602 seconds Complete requests: 10000 Failed requests: 0 Write errors: 0 Total transferred: 164220000 bytes HTML transferred: 163840000 bytes Requests per second: 2776.02 [#/sec] (mean) Time per request: 108.068 [ms] (mean) Time per request: 0.360 [ms] (mean, across all concurrent requests) Transfer rate: 44519.36 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 0 36 326.6 0 3008 Processing: 1 47 29.8 46 570 Waiting: 1 47 29.8 46 570 Total: 1 83 328.9 46 3094 Percentage of the requests served within a certain time (ms) 50% 46 66% 60 75% 68 80% 72 90% 81 95% 90 98% 141 99% 3033 100% 3094 (longest request) madding@wmmad:~$ /usr/mytools/httpd/bin/ab -c 300 -n 10000 http://127.0.0.1:1340/ This is ApacheBench, Version 2.3 <$Revision: 655654 {1}gt; Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/ Licensed to The Apache Software Foundation, http://www.apache.org/ Benchmarking 127.0.0.1 (be patient) Completed 1000 requests Completed 2000 requests Completed 3000 requests Completed 4000 requests Completed 5000 requests Completed 6000 requests Completed 7000 requests Completed 8000 requests Completed 9000 requests Completed 10000 requests Finished 10000 requests Server Software: Server Hostname: 127.0.0.1 Server Port: 1340 Document Path: / Document Length: 16384 bytes Concurrency Level: 300 Time taken for tests: 1.167 seconds Complete requests: 10000 Failed requests: 0 Write errors: 0 Total transferred: 164220000 bytes HTML transferred: 163840000 bytes Requests per second: 8565.63 [#/sec] (mean) Time per request: 35.024 [ms] (mean) Time per requ <div class="clearfix"></div> </div> <nav aria-label="..."> <ul class="pager"> <li class="previous"><a href="20731">上一篇：【学习札记】JavaScript正则表达式 </a></li> <li class="next"><a href="20729">下一篇： jsp charset 跟 pageEncoding的联系和区别 </a></li> </ul> </nav> <div class="alert alert-warning" role="alert"> <strong>免责声明：</strong> 本文仅代表作者个人观点，与爱易网无关。其原创性以及文中陈述文字和内容未经本站证实，对本文以及其中全部或者部分内容、文字的真实性、完整性、及时性本站不作任何保证或承诺，请读者仅作参考，并请自行核实相关内容。 </div> <div class="panel panel-default"> <div class="panel-heading"> <h3 class="panel-title">相关资料<span><a target="_blank" class="pull-right" href="/javasript/">更多></a></span></h3> </div> <div class="panel-body row"> <ol> <div class="col-md-6 col-xs-12"> <li class="articleAbout"><a href='/javasript/35249' title=' javascript 操作 div <h3>标记解决方法 ' target="_blank"> javascript 操作 div <h3>标记解决方法 </a></li></div> <div class="col-md-6 col-xs-12"> <li class="articleAbout"><a href='/javasript/29839' title=' $(document).ready qtip后怎么在后面动态改变呢 ' target="_blank"> $(document).ready qtip后怎么在后面动态改变呢 </a></li></div> <div class="col-md-6 col-xs-12"> <li class="articleAbout"><a href='/javasript/1430' title=' JS判断是否IE浏览器（IE6－IE11） ' target="_blank"> JS判断是否IE浏览器（IE6－IE11） </a></li></div> <div class="col-md-6 col-xs-12"> <li class="articleAbout"><a href='/javasript/37765' title=' 0nMouseout回帖就给分解决办法 ' target="_blank"> 0nMouseout回帖就给分解决办法 </a></li></div> <div class="col-md-6 col-xs-12"> <li class="articleAbout"><a href='/javasript/217' title=' js前端的1些小应用 ' target="_blank"> js前端的1些小应用 </a></li></div> <div class="col-md-6 col-xs-12"> <li class="articleAbout"><a href='/javasript/37294' title=' 怎么在javascipt中用变量对vml中polyline的points赋值 ' target="_blank"> 怎么在javascipt中用变量对vml中polyline的points赋值 </a></li></div> <div class="col-md-6 col-xs-12"> <li class="articleAbout"><a href='/javasript/17412' title=' js复选框全选跟消选并取值 ' target="_blank"> js复选框全选跟消选并取值 </a></li></div> <div class="col-md-6 col-xs-12"> <li class="articleAbout"><a href='/javasript/9596' title=' 计算某DIV到顶部距离是不是可能 ' target="_blank"> 计算某DIV到顶部距离是不是可能 </a></li></div> <div class="col-md-6 col-xs-12"> <li class="articleAbout"><a href='/javasript/23500' title=' js取目前url参数 ' target="_blank"> js取目前url参数 </a></li></div> </ol> </div> </div> </div> <div class="col-lg-4 hidden-sm hidden-xs">  <a id="AdPageRight1_AdPageRight" href="http://www.tdyun.com/host/?aiyiweb" target="_blank"><img class="img-responsive" src="/images/TdPageAd/hostTest15dayCdn.png" alt="香港全能空间免费试用15天，送网站加速30M" /></a> <script src='/Scripts/AdContentPage300_1.js' language='javascript'></script> <script src='/Scripts/AdContentPage300_2.js' language='javascript'></script> <script src='/Scripts/AdContentPage300_3.js' language='javascript'></script> <div class="panel panel-default"> <div class="panel-heading"> <h3 class="panel-title">推荐阅读<span><a target="_blank" class="pull-right" href="/javasript/">更多></a></span></h3> </div> <div class="panel-body"> <ol> <li class="articleAbout"><a href=/javasript/404 title=' easyui自定义验证，提示框批改 ' target="_blank"> easyui自定义验证，提示框批改 </a></li> <li class="articleAbout"><a href=/javasript/15551 title=' struts2+hibernate+spring+jquery回来json List列表 ' target="_blank"> struts2+hibernate+spring+jquery回来json List列表 </a></li> <li class="articleAbout"><a href=/javasript/7302 title=' extjs TabPanel 多行题目 ' target="_blank"> extjs TabPanel 多行题目 </a></li> <li class="articleAbout"><a href=/javasript/6489 title=' 谋求miniui破解版 ' target="_blank"> 谋求miniui破解版 </a></li> <li class="articleAbout"><a href=/javasript/1984 title=' JQery图片弹出兼容有关问题 ' target="_blank"> JQery图片弹出兼容有关问题 </a></li> <li class="articleAbout"><a href=/javasript/30869 title=' 京东上边的横向的导航条如何写的 ' target="_blank"> 京东上边的横向的导航条如何写的 </a></li> <li class="articleAbout"><a href=/javasript/2272 title=' onscroll 兼容IE和FF,该如何解决 ' target="_blank"> onscroll 兼容IE和FF,该如何解决 </a></li> <li class="articleAbout"><a href=/javasript/29387 title=' JS导出table替excel ' target="_blank"> JS导出table替excel </a></li> <li class="articleAbout"><a href=/javasript/8762 title=' jquery ui中的Tab怎么实现动态隐藏某个Tabitem ' target="_blank"> jquery ui中的Tab怎么实现动态隐藏某个Tabitem </a></li> <li class="articleAbout"><a href=/javasript/36530 title=' 一個javascript的基础有关问题,变量的连接问題.多谢! 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