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WebSockets protocol vs HTTP
There are many blogs and discussions about websocket and HTTP, and many developers and sites strongly advocate websockets, but i still can not understand why.
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记一次MongoDB性能问题 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...些警告信息：
WARNING: You are running on a NUMA machine. We suggest launching mongod like this to avoid performance problems: numactl –interleave=all mongod [other options]
当时我并不太清楚NUMA是什么东西，所以没有处理，只是把问题反馈给了运维人员，后...
How to get a substring of text?
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Since you tagged it Rails, you can use truncate:
http://api.rubyonrails.org/classes/ActionView/Helpers/TextHelper.html#method-i-truncate
Example:
truncate(@text, :length => 17)
Excerpt is nice to know too, it lets you display an excerpt of a text Like so:
excerpt(...
What is the best way to paginate results in SQL Server
What is the best way (performance wise) to paginate results in SQL Server 2000, 2005, 2008, 2012 if you also want to get the total number of results (before paginating)?
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Why does Math.round(0.49999999999999994) return 1?
... return (long)floor(a + 0.5d);
else
return 0;
}
1. http://docs.oracle.com/javase/6/docs/api/java/lang/Math.html#round%28double%29
2. http://bugs.java.com/bugdatabase/view_bug.do?bug_id=6430675 (credits to @SimonNickerson for finding this)
3. http://docs.oracle.com/javas...
`require': no such file to load — mkmf (LoadError)
...el libxml2 libxml2-devel libxslt libxslt-devel
worked for me on fedora.
http://nokogiri.org/tutorials/installing_nokogiri.html
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Permission denied (publickey) when deploying heroku code. fatal: The remote end hung up unexpectedly
I'm attempting to deploy my code to heroku with the following command line:
34 Answers
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erb, haml or slim: which one do you suggest? And why? [closed]
...aml:
Slim is currently about eight times faster than haml.
Slim supports HTTP streaming, while HAML doesn't.
Slim has a more natural syntax: a href="foo.html"
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WAMP error: Forbidden You don't have permission to access /phpmyadmin/ on this server
...file are required).
System:
Windows 7
wampserver2.2d-x64
This works:
http://127.0.0.1/phpmyadmin/
This one fails:
http://localhost/phpmyadmin/
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What is a .h.gch file?
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Its a GCC precompiled header.
Wikipedia has a half decent explanation, http://en.wikipedia.org/wiki/Precompiled_header
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