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Why do x86-64 instructions on 32-bit registers zero the upper part of the full 64-bit register?
... the high half doesn't create a dependency on the previous value, that the CPU would have to wait on. The register renaming mechanism would essentially be defeated if it wasn't done that way.
This way you can write fast code using 32-bit values in 64-bit mode without having to explicitly break depe...
Is it worthwile to learn assembly language? [closed]
...appens at the lower levels. As you research assembler you will learn about cpu pipelining, branch prediction, cache alignment, SIMD, instruction reordering and so on. Knowledge of these will help you write better high-level code.
Furthermore, the conventional wisdom is to not try to hand-optimise a...
Convert UTC/GMT time to local time
... and found that the DateTime.Parse represented a significant percentage of CPU usage. (Incidentally, the CultureInfo constructor was not a significant contributor to CPU usage.)
So I set up a console app to parse a date/time string 10000 times in a variety of ways. Bottom line:
Parse() 10 sec
P...
How to calculate a logistic sigmoid function in Python?
... answered Aug 6 '14 at 15:32
Théo TThéo T
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构建高并发高可用的电商平台架构实践 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...方式
因都在内存操作，所以逻辑的操作非常快，减少了CPU的切换开销，所以为单线程的模式（逻辑处理线程和主线程是一个）。
reactor模式，实现自己的多路复用NIO机制（epoll，select，kqueue等）
单线程处理多任务
数据结构
ha...
Multiple Updates in MySQL
...afe code for the variant with case statement ?
– François M.
Jul 21 '15 at 16:44
1
I find the in...
How to get the first column of a pandas DataFrame as a Series?
...he column's header has e.g. spaces in it.
– Jean-François Corbett
Jan 24 '18 at 12:54
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Input and Output binary streams using JERSEY?
...e binary stream to the server (with jersey 2.x) ?
– Débora
May 17 '14 at 3:23
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Cropping an UIImage
... answered Oct 9 '11 at 15:03
Vilém KurzVilém Kurz
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How to fix: “UnicodeDecodeError: 'ascii' codec can't decode byte”
...code using the u prefix to strings. E.g.
>>> my_u = u'my ünicôdé strįng'
>>> type(my_u)
<type 'unicode'>
Unicode strings may also come from file, databases and network modules. When this happens, you don't need to worry about the encoding.
Gotchas
Conversion from str...