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Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?
...iplication, where my answer has a section on why rcpps is not a throughput win anymore. (Or a latency win), and numbers on divide throughput/latency.
– Peter Cordes
Apr 25 '18 at 11:38
...
String concatenation: concat() vs “+” operator
...thod should be faster. However, with more strings the StringBuilder method wins, at least in terms of performance.
The source code of String and StringBuilder (and its package-private base class) is available in src.zip of the Sun JDK. You can see that you are building up a char array (resizing as ...
记一次MongoDB性能问题 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...e内核参数的说明，可以参考官方文档。
注：从MongoDB1.9.2开始：MongoDB会在启动时自动设置zone_reclaim_mode。
至于NUMA的含义，简单点说，在有多个物理CPU的架构下，NUMA把内存分为本地和远程，每个物理CPU都有属于自己的本地内存...
What is the difference between include and extend in Ruby?
...ils about include, with its default behavior, assuming you've run the following code
class Klazz
include Mod
end
If Mod is already included in Klazz, or one of its ancestors, the include statement has no effect
It also includes Mod's constants in Klazz, as long as they don't clash
It gives Kla...
Does pandas iterrows have performance issues?
...ly at the start of the iteration; this savings alone is one of the biggest wins.
Better caching: Iterating over a C array is cache-friendly and thus very fast. A pandas DataFrame is a "column-oriented table", which means that each column is really just an array. So the native actions you can perform...
Benefits of EBS vs. instance-store (and vice-versa) [closed]
...stance storage that I see are cost-savings. Otherwise EBS-backed instances win. Eric mentioned all the advantages.
[2012-07-16] I would phrase this answer a lot different today.
I haven't had any good experience with EBS-backed instances in the past year or so. The last downtimes on AWS pretty m...
大数据时代的数据化运营 - 资讯 - 清泛网 - 专注C/C++及内核技术
...率，或者在一些内容进行分析。我们遇到了一个现状，一开始我们是比较小规模进行测试的时候，发现这个产品还可以，我们决定按照整个规划去上线产品，上线产品之后，我们发现数据离我们最初的预期差很多，比如次流明显...
What is the most efficient string concatenation method in python?
...ython (like StringBuilder in C# or StringBuffer in Java)? I found following methods here :
11 Answers
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解决：CTreeCtrl控件SetCheck无效的问题 - C/C++ - 清泛网 - 专注C/C++及内核技术
...，修改了每个节点的选择状态。
但是它为何这么做？我开始猜测和它的图表列表有关系。为了验证这个想法，加入下面的代码：
CImageList* pStateIcon = m_Tree.GetImageList(TVSIL_STATE);
int nItem = (pStateIcon == NULL)?(0):(pStateIcon->GetImageCount())...
大数据能否拯救中国足球？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...教练界对数据的需求也越来越大。”
朱广沪表示：“刚开始凭感觉看球员的数据，主要是肉眼，非常不准确，从巴西回来后，对数据有了初步的理解，会用一些数据做针对性的部署，我记得当年带队打申花的时候，赛前就对阿...