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Why is there huge performance hit in 2048x2048 versus 2047x2047 array multiplication?
...in L2 (i.e when you access matice2[0, 0], matice2[1, 0], matice2[2, 0] ... etc, nothing gets evicted) than there is no problem with cache misses with matice2 either.
Now to go deeper in how caches works, if byte address of your variable is X, than the cache line for it would be (X >> 6) &...
Convert from enum ordinal to enum type
...ubs! A C programmer would allocate 1 byte for each: 'const char CLUBS=0;' etc... Yes,a HashMap lookup is O(1), but the memory and CPU overhead of a HashMap, in this case make it many orders of magnitude slower and resource hungry than calling .values() directly! No wonder Java is such a memory hog ...
CPU Privilege Rings: Why rings 1 and 2 aren't used?
A couple of questions regarding the x86 CPU privilege rings:
3 Answers
3
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Stack Overflow：StackExchange网络不同主题网站的”祖父“ - 更多技术 - ...
...最早设立的是Stack Overflow，即一个供程序员互相解答编程问题的问答网站，随后我们试图将同样的技术推广到编程之外的领域，比如说烹饪、摄影等等，每个主题的问答站点就都称为StackExchange，合起来也就是StackExchange网络。因...
What and where are the stack and heap?
... the processor translates to physical addresses and there are page faults, etc. They keep track of what pages belong to which applications. You never really need to worry about this, though, because you just use whatever method your programming language uses to allocate and free memory, and check ...
译文：理解Java中的弱引用 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...。既然它们是一些不知名的概念，我简单就着前面的三个问题来说明一下。
强引用(Strong Reference)
强引用就是我们经常使用的引用，其写法如下
StringBuffer buffer = new StringBuffer();
上面创建了一个StringBuffer对象，并将这个对象的...
当ORACLE 11G 遇到 JUNIPER 防火墙 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...掉防火墙改为直连，WINDOWS的IP改为 172.16.110.70/24 没有任何问题。故判断是防火墙的问题。
防火墙策略全开 允许UNTRUNT 到TRUNT ANY 结果还是不行。
开始百度
第一个说法：需要更改windows的注册表
\\HKEY_LOCAL_MACHINE\SOFTW...
Java's Virtual Machine and CLR
...popping those operands off the stack whenever an instruction (add, divide, etc) needs to consume those operands. Each instruction pushes its results back onto the stack.
It's a convenient way to implement a virtual machine, because pretty much every CPU in the world has a stack, but the number of r...
Android微信智能心跳方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...哥开始构思第一个方案，我们开始想用统计的方法来解决问题，当我们拿着第一个方案和Ray讨论时，发现不能优雅应对Ray的所有提问：1、测试环境的准确性，失败到底是因为网络的特性导致还是因为用户当前的环境变化导致的...
CSS: Animation vs. Transition
...raight on point:
Transition:
Needs a triggering element (:hover, :focus etc.)
Only 2 animation states (start and end)
Used for simpler animations (buttons, dropdown menus and so on)
Easier to create but not so many animation/effect possibilities
Animation @keyframes:
It can be used for endles...