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linux下iptables配置详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...成DROP的话)
允许loopback!(不然会导致DNS无法正常关闭等问题)
IPTABLES -A INPUT -i lo -p all -j ACCEPT (如果是INPUT DROP)
IPTABLES -A OUTPUT -o lo -p all -j ACCEPT(如果是OUTPUT DROP)
下面写OUTPUT链,OUTPUT链默认规则是ACCEPT,所以我们就写需要DROP(放弃)...
What is the best open XML parser for C++? [duplicate]
...ments, computer games, or any other applications where available memory or CPU processing power comes at a premium. RapidXML is licensed under Boost Software License and its source code is freely available.
Features
Parsing speed (including DOM tree
building) approaching speed of
strlen function ...
C# switch statement limitations - why?
...C# compiler. Of course, this isn’t final, as the actual instructions the CPU runs are then created by the JIT.
I have checked the final CPU instructions actually executed on my x86 machine, and can confirm a simple adjacent set switch doing something like:
jmp ds:300025F0[eax*4]
Where a ...
How do I specify the platform for MSBuild?
...ution must be configured for both platforms. Actually you just have an Any CPU configuration.
How to check the available configuration for a project
To check the available configuration for a given project, open the project file (*.csproj for example) and look for a PropertyGroup with the right Co...
If vs. Switch Speed
...complex but basically boils down to the table indirection neutering modern cpu jump target buffers and so wipes out the branch predictor. I vaguely recall a paper at a GCC conference on codegen for switches.
– olliej
Jan 14 '09 at 23:46
...
What is a memory fence?
...
For performance gains modern CPUs often execute instructions out of order to make maximum use of the available silicon (including memory read/writes). Because the hardware enforces instructions integrity you never notice this in a single thread of execut...
Does async(launch::async) in C++11 make thread pools obsolete for avoiding expensive thread creation
...
And native, on my MacBook Pro 15" (Intel(R) Core(TM) i7-7820HQ CPU @ 2.90GHz) with Apple LLVM version 10.0.0 (clang-1000.10.44.4) under OSX 10.13.6, I get this:
Do nothing calls per second: 22078079
Empty calls per second: 21847547
New thread calls per second: 433...
C# Thread safe fast(est) counter
...d" to (x64).
This "bus lock" statement locks the bus to prevent another CPU from accessing the bus while the calling CPU does its operation. Now, take a look at the C# lock() statement's IL. Here you will see calls to Monitor in order to begin or end a section.
In other words, .Net lock() stat...
PHP memory profiling
... like shown below:
Xhprof + Xhgui (the best in my opinion to profile both cpu and memory)
With Xhprof and Xhgui you can profile the cpu usage as well or just the memory usage if that's your issue at the moment.
It's a very complete solutions, it gives you full control and the logs can be written bo...
CruiseControl.Net 进行持续化集成 - IT产品资讯 - 清泛网 - 专注C/C++及内核技术
...ver服务，在启动之前，需要先解决一下可能最影响情绪的问题：我们知道windows services默认情况下是用本地系统账户运行的，可一般情况下我们会在当前操作用户下设置对vss共享目录的访问权限，比如当前windows运行账户为administra...