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分布式系统的事务处理 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...据一致性。这个是一个很难的问题。 让我们用最经典的Use Case：“A帐号向B帐号汇钱”来说明一下，熟悉RDBMS事务的都知道从帐号A到帐号B需要6个操作：
从A帐号中把余额读出来。
对A帐号做减法操作。
把结果写回A帐号中。
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Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_
I was looking for the fastest way to popcount large arrays of data. I encountered a very weird effect: Changing the loop variable from unsigned to uint64_t made the performance drop by 50% on my PC.
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What is the best way to compute trending topics or tags?
Many sites offer some statistics like "The hottest topics in the last 24h". For example, Topix.com shows this in its section "News Trends". There, you can see the topics which have the fastest growing number of mentions.
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When to use self over $this?
In PHP 5, what is the difference between using self and $this ?
23 Answers
23
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Move capture in lambda
How do I capture by move (also known as rvalue reference) in a C++11 lambda?
6 Answers
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What techniques can be used to speed up C++ compilation times?
What techniques can be used to speed up C++ compilation times?
27 Answers
27
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How to select rows from a DataFrame based on column values?
How to select rows from a DataFrame based on values in some column in Pandas?
10 Answers
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Webfonts or Locally loaded fonts?
Ever since the troubles brought on by using Cufon I ventured away from using external font resources, but as of late, I have been looking for alternate methods of loading fonts to see if there's a better way; better methods have a way of just appearing out of the blue.
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Is Unit Testing worth the effort? [closed]
I am working to integrate unit testing into the development process on the team I work on and there are some sceptics. What are some good ways to convince the sceptical developers on the team of the value of Unit Testing? In my specific case we would be adding Unit Tests as we add functionality or f...
What happens when a computer program runs?
I know the general theory but I can't fit in the details.
4 Answers
4
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