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Why does Java switch on contiguous ints appear to run faster with added cases?
...plying double variables by 10 raised to arbitrary non-negative int exponent s. One fast way (edit: but not the fastest possible, see Update 2 below) to get the multiplied value is to switch on the exponent :
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mmap() vs. reading blocks
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I was trying to find the final word on mmap / read performance on Linux and I came across a nice post (link) on the Linux kernel mailing list. It's from 2000, so there have been many improvements to IO and virtual memory in the kernel since then, but it nicely explains the reason why mmap or r...
How does a hash table work?
I'm looking for an explanation of how a hash table works - in plain English for a simpleton like me!
15 Answers
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Fastest way to iterate over all the chars in a String
...re strings as byte[] by default.
SECOND UPDATE: As of 2016-10-25, on my AMDx64 8core and source 1.8, there is no difference between using 'charAt' and field access. It appears that the jvm is sufficiently optimized to inline and streamline any 'string.charAt(n)' calls.
THIRD UPDATE: As of 2020-09-07...
Refresh image with a new one at the same url
...ache breaker" later, still shows the old cached version (at least in firefox) both ? and # :(
– T4NK3R
Aug 29 '15 at 8:52
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Linux下部署企业级邮件服务器(postfix + dovecot + extmail) - 开源 & Gith...
Linux下部署企业级邮件服务器(postfix + dovecot + extmail)postfix + dovecot + extmail解决方案搭建邮件服务器全攻略，以及搭建过程中常见问题的解决方法汇总。首先通过一幅图看看整个解决方案的原理：
当用户通过extmail登陆时，首先extm...
Logging best practices [closed]
... logging in real applications. Here are some questions that might help to explain your answer.
10 Answers
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Comparison between Corona, Phonegap, Titanium
... is that Titanium and PhoneGap are more similar than different. They both expose mobile phone functions through a set of javascript APIs, and the application's logic (html, css, javascript) runs inside a native WebView control.
PhoneGap is not just a native wrapper of a web app. Through the PhoneG...
Git and Mercurial - Compare and Contrast
...rcurial for this writeup
Summary
Here it would be nice to have some syntax for table, something like in PHPMarkdown / MultiMarkdown / Maruku extension of Markdown
Repository structure: Mercurial doesn't allow octopus merges (with more than two parents), nor tagging non-commit objects.
Tags: Mercu...
Regular expression to match non-ASCII characters?
What is the easiest way to match non-ASCII characters in a regex? I would like to match all words individually in an input string, but the language may not be English, so I will need to match things like ü, ö, ß, and ñ. Also, this is in Javascript/jQuery, so any solution will need to apply to th...