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What do 'real', 'user' and 'sys' mean in the output of time(1)?
...er of context switches may also be gathered by time.
On a multi-processor machine, a multi-threaded process or a process forking children could have an elapsed time smaller than the total CPU time - as different threads or processes may run in parallel. Also, the time statistics reported come from...
How to update Python?
...ling ActivePython 2.7.
Sage recommends that you install it into a virtual machine, and provides a Oracle VirtualBox image file that can be used for this purpose. Upgrades are handled internally by issuing the sage -upgrade command.
Anaconda can be updated by using the conda command:
conda update -...
Why is Git better than Subversion?
...terfaces in development. Some good ones include TortoiseGit and GitHub for Mac.
Partial checkouts/clones of repositories are not possible at the moment (I read that it's in development). However, there is submodule support. Git 1.7+ supports sparse checkouts.
It might be harder to learn, even though...
How do I use vimdiff to resolve a git merge conflict?
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@AndersKitson, since you are on Mac OS X, FileMerge is perfect, free and comes with XCode.
– romainl
Feb 16 '13 at 8:27
8
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Class does not implement its superclass's required members
...nt (i.e. in Objective-C, since the day I started programming Cocoa back in Mac OS X 10.0) to deal with initializers that your class is not prepared to handle. The docs have always been quite clear about your responsibilities in this regard. But how many of us bothered to fulfill them, completely and...
Colors in JavaScript console
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on Mac OS X it's at ~/Library/Application\ Support/Google/Chrome/Default/User\ StyleSheets/Custom.css.
– Lance Pollard
Nov 17 '11 at 21:58
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PHP parse/syntax errors; and how to solve them
...s \n newlines, not \r carriage returns.
Which is occasionally an issue for MacOS users (even on OS X for misconfigured editors).
It often only surfaces as an issue when single-line // or # comments are used. Multiline /*...*/ comments do seldom disturb the parser when linebreaks get ignored.
If y...
How to avoid reverse engineering of an APK file?
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First rule of app security: Any machine to which an attacker gains unrestricted physical or electronic access now belongs to your attacker, regardless of where it actually is or what you paid for it.
Second rule of app security: Any software that leaves the...
Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_
...it's hard to read if I put results in comment.
I get these results with a Mac Pro (Westmere 6-Cores Xeon 3.33 GHz). I compiled it with clang -O3 -msse4 -lstdc++ a.cpp -o a (-O2 get same result).
clang with uint64_t size=atol(argv[1])<<20;
unsigned 41950110000 0.811198 sec 12.9263 GB/...
正则表达式 30 分钟入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...很熟练的人通过自己学习这篇教程，最后都能在文章采集系统中使用正则表达式完成任务。而且，他写的表达式中，还使用了“零宽断言”等“高级”技术。
所以，如果你能具体地说明你的问题，我很愿意帮助你。但是如果...