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Why does my application spend 24% of its life doing a null check?
...uting instructions, it is accessing memory. The execution core of a modern CPU is many times faster than the memory bus. A problem related to distance, the further an electrical signal has to travel, the harder it gets to get that signal delivered to the other end of the wire without it being corrup...
Finding Number of Cores in Java
...logical threads actually available to the JVM (at startup I guess). Using CPU affinity the user/OS can restrict the number of "cores" a JVM sees. You can even do it on a running JVM but I'm not too sure how this influence availableProcessors().
– SyntaxT3rr0r
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What is the advantage of GCC's __builtin_expect in if else statements?
...ase precedes the foo case (as opposed to the C code). This can utilise the CPU pipeline better, since a jump thrashes the already fetched instructions.
Before the jump is executed, the instructions below it (the bar case) are pushed to the pipeline. Since the foo case is unlikely, jumping too is un...
Select random lines from a file
...0 --file lines_78000000000.txt > /dev/null 0.02s user 0.01s system 80% cpu 0.047 total
The reason it is so fast, well I don't read the whole file and just move the file pointer 10 times and print the line after the pointer.
Gitlab Repo
Old attempt
First I needed a file of 78.000.000.000 lines:...
OnInitUpdate、OnUpdate、OnDraw与OnPaint - C/C++ - 清泛网 - 专注C/C++及内核技术
...。
在用户进行输入后如何使视的状态得到更新？这个问题在一个文档对应一个视图时是不存在的，但是现在有一个文档对应了两个视图，当在一个视上进行了 输入时如何保证另一个视也得到通知呢？MFC的做法是利用文档来处...
StackOverflow程序员推荐：每个程序员都应读的30本书 - 杂谈 - 清泛网 - 专...
...尔、巴赫书》。他极为深入研究了程序员每日都要面对的问题：递归、验证、证明和布尔代数。这是一本很出色的读物，难度不大，偶尔有挑战，一旦你要鏖战到底，将是非常值得的。 – Jonik
13. 《代码整洁之道》
推荐数...
“register” keyword in C?
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It tells the compiler to try to use a CPU register, instead of RAM, to store the variable. Registers are in the CPU and much faster to access than RAM. But it's only a suggestion to the compiler, and it may not follow through.
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How to detect idle time in JavaScript elegantly?
...ls the function, rather than letting it sit idle by.
It doesn't catch zero CPU usage directly, but that is impossible, because executing a function causes CPU usage. And user inactivity eventually leads to zero CPU usage, so indirectly it does catch zero CPU usage.
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Bill Gross超火爆演讲: 创业成功唯一最关键因素 - 资讯 - 清泛网 - 专注C/C++及内核技术
...业组织这么伟大，为什么他们中绝大部分都会失败？这个问题，是我想知道的，我希望找出真正能影响它们成功的关键性因素，而且，我想尝试用一种系统化的方式研究，以避免我一些直觉性的东西，以及因为过去经历我曾操盘...
How can I check if a Perl array contains a particular value?
...grep, hash...
any: 0 wallclock secs ( 0.67 usr + 0.00 sys = 0.67 CPU) @ 149253.73/s (n=100000)
first: 1 wallclock secs ( 0.63 usr + 0.01 sys = 0.64 CPU) @ 156250.00/s (n=100000)
grep: 42 wallclock secs (41.95 usr + 0.08 sys = 42.03 CPU) @ 2379.25/s (n=100000)
hash: 0 ...