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高并发服务端分布式系统设计概要 - C/C++ - 清泛网 - 专注C/C++及内核技术
...好了，现在我们的“山推”系统设计完成了，但是要将它编码实现，还有很远的路要走，细枝末节的问题也会暴露更多。如果该系统用于线上计算，如有大量的Map-Reduce运行于group中，系统将会更复杂，因为此时不光考虑的数据的...
App Inventor 2 上传文件到服务器的方案全总结 - App Inventor 2 中文网 - ...
1、图片Base64化，然后通过Web客户端POST文本的方式，发送数据，服务端base64解码后，存储文件。下载过程是Web客户端通过网络url下载文件到手机。
类似地，也可以将图片Base64化后分片存储到网络微数据库。下...
- App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
...每个MQTT平台应该是有限制的，经过实际测试befa.com平台，base64文本大小约100KB以内的消息订阅可以正常接收，超过则无法接收。建议你自己的平台也进行一下测试，如果有限制，则要考虑源头压缩图片后再base64传输。
注：图片ba...
Speed comparison with Project Euler: C vs Python vs Erlang vs Haskell
...onent of the mod operation (they aren't the same). If you look in the GHC Base library you see mod tests for several conditions and adjusts the sign accordingly. (see modInt# in Base.lhs)
– Thomas M. DuBuisson
Aug 6 '11 at 5:23
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Why would introducing useless MOV instructions speed up a tight loop in x86_64 assembly?
...ain, but can be avoided by using dependency breaking idioms. In processors based on Intel Core micro-architecture, a number of instructions can help clear execution dependency when software uses these instruction to clear register content to zero. Break dependencies on portions of registers between ...
Why is XOR the default way to combine hashes?
... many (most?) cases greatly increases the likelihood of collisions in hash-based data structures.
– Drew Noakes
Nov 15 '16 at 12:38
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How can I tell if a library was compiled with -g?
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Even for Embedded linux based on kernel 2.6.35, xxx-objdump, xxx-nm works fine.
– agfe2
May 22 '14 at 11:44
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What's the difference between size_t and int in C++?
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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Need a good hex editor for Linux [closed]
...apabilities.
Highlighting of selection pattern matches in the file.
Plugin based architecture.
Export of data to text and html (others with plugins).
Bitwise operations on data.
A comprehensive user manual.
wxHexEditor is another Free Hex Editor, built because there is no good hex editor for Linux...
How can I get `find` to ignore .svn directories?
...ingly, because Subversion stores duplicates of each file in its .svn/text-base/ directories my simple searches end up getting lots of duplicate results. For example, I want to recursively search for uint in multiple messages.h and messages.cpp files:
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