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tcp端口状态ESTABLISHED、TIME_WAIT、CLOSE_WAIT 、SYN_RECV等详解 - C/C++...
...TIME_WAIT的等待时间
ubuntu机器设置
vi /etc/sysctl.conf
编辑文件，加入以下内容：
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_fin_timeout = 30
然后执行 /sbin/sysctl -p 让参数生效。
net.ipv4.tcp_syncooki...
VM 磁盘空间扩容引起的一些问题 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...备中可以认到LUN 60 LUN80 容量显示正确，但不能正确识别文件格式。在ESX1的数据储存中认到LUN60 LUN80的准确容量，在ESX2的数据存储中只能认到LUN60的正确容量，LUN80根本找不到。
ESX2主机在设备
LUN 60一切正常。
为...
C#位运算符（C#按位与、按位或 等） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...以整型量格式输出三个域的内容。第13行把位域变量bit的地址送给指针变量pbit。第14行用指针方式给位域a重新赋值，赋为0。第15行使用了复合的位运算符"&="， 该行相当于： pbit->b=pbit->b&3位域b中原有值为7，与3作按位与运算的结...
Tactics for using PHP in a high-load site
...completely different as well.
Databases
Don't use MySQLi -- PDO is the 'modern' OO database access layer. The most important feature to use is placeholders in your queries. It's smart enough to use server side prepares and other optimizations for you as well.
You probably don't want to break your...
ab load testing
...d I consider an average response time valid if it is 2 seconds". Then just modify your -c level until you are hitting 2 seconds of average response time (but make sure the max response time and stddev is still valid) and see how big you can make -c.
I hope I explained this clear :) Good luck
...
Expand a random range from 1–5 to 1–7
...re are four big holes: (2..5), (7..10), (12..15), (17..21). Finally you do mod 7 and add 1, giving (2, 7, 5, 3, 1). So neither 4 nor 6 ever occur. But (see above shortcut) we knew there could only be 5 numbers in the resulting range all along, so there had to be two gaps.
– Dan...
Apache两种工作模式区别及配置切换 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...是worker MPM，依此类推）。再查看缺省生成的httpd.conf配置文件，里面包含如下配置段：
<IfModule prefork.c>
StartServers 5
MinSpareServers 5
MaxSpareServers 10
MaxClients 150
MaxRequestsPerChild 0
</IfModule>
prefork的工作原理是，控制进程在最...
libxml install error using pip
...hy the downvote? This is the correct answer. It says "Python.h 没有那个文件或目录" Which means "no such file or directory". The python header files are missing. Install them and it will work.
– Lennart Regebro
Mar 3 '11 at 21:59
...
What is the difference between a 'closure' and a 'lambda'?
... }
//filter for even numbers
filter([0,1,2,3,4,5,6], lambda(x) {return (x mod 2 == 0)});
A closure may be a named or anonymous function, but is known as such when it "closes over" variables in the scope where the function is defined, i.e., the closure will still refer to the environment with any...
常用快速产品原型设计工具推荐 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...接的文档并输出成为HTML、PNG、OpenOffice、Word、PDF等格式的文件。
Prototype Composer
Prototype Composer是一款Serena出品的能够让非技术型的用户进行原型设计的免费软件，同时它还包括商业过程、活动、用户界面、需求和数据，不但...