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What do the terms “CPU bound” and “I/O bound” mean?
...x, then theck if CPU% / 100 < n threads. If yes, you are IO bound, e.g. blocking reads are just waiting for data and the scheduler is skipping that process. Then use further tools like sudo iotop to decide which IO is the problem exactly.
Or, if execution is quick, and you parametrize the number ...
Alternate FizzBuzz Questions [closed]
...
here is my php solution :) ideone.com/BnJQ3 3 minutes :)
– Trufa
Dec 16 '10 at 23:03
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Using -performSelector: vs. just calling the method
...n of a horrible design" is overly simplistic. This was what we had before blocks were available, and not all uses are bad, then or now. Although now that blocks are available, that's probably a better choice for new code unless you are doing something very simple.
– Ethan
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Do you have to put Task.Run in a method to make it async?
...w do I create an async method that can yield back to its caller instead of blocking", the answer is to declare the method async and use await for its "yielding" points:
private async Task<int> GetWebPageHtmlSizeAsync()
{
var client = new HttpClient();
var html = await client.GetAsync("htt...
重构理论及实践——用工厂模式重构c++后台代码 - C/C++ - 清泛网 - 专注C/C...
...是含着OOP的金钥匙诞生，天生贵族血统的语言（用最好的php的同学别拍我），这些高级货似乎天生就是为这些高级语言准备的。像楼主这样工作有些年了还一直主要在码tooooooold的c/c++的老狗，码好你的功能就行了，用什么设计模...
Why is the Android emulator so slow? How can we speed up the Android emulator? [closed]
...nk shows how to install them manually: forum.xda-developers.com/showthread.php?t=2528952
– Apfelsaft
May 7 '14 at 6:35
2
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Is memcached a dinosaur in comparison to Redis? [closed]
...thanks for your post. I will definitely check it out. Can i use Membase in PHP?
– Industrial
Aug 27 '10 at 14:27
4
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How does one write code that best utilizes the CPU cache to improve performance?
... data (loop fusion), and employing rewriting techniques known as tiling or blocking all strive to avoid those extra memory fetches.
While there are some rules of thumb for this rewrite exercise, you typically have to carefully consider loop carried data dependencies, to ensure that you don't affect...
NOT IN vs NOT EXISTS
...o null.
This post explains it very well
http://sqlinthewild.co.za/index.php/2010/02/18/not-exists-vs-not-in/
When the subquery returns even one null, NOT IN will not match any
rows.
The reason for this can be found by looking at the details of what the
NOT IN operation actually means...
How to avoid “if” chains?
...-pattern. It is called an arrow because the chain of nested ifs form code blocks that expand farther and farther to the right and then back to the left, forming a visual arrow that "points" to the right side of the code editor pane.
Flatten the Arrow with the Guard
Some common ways of avoiding ...