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Why doesn't C have unsigned floats?
...d floats is because there is no equivalent machine code operations for the CPU to execute. So it would be very inefficient to support it.
If C++ did support it, then you would be sometimes using an unsigned float and not realizing that your performance has just been killed. If C++ supported it ...
How to benchmark efficiency of PHP script
...rces become scarce. This raises another question: are you bottlenecking on CPU? RAM? I/O?
You also need to look beyond just the code you are running in your scripts to how your scripts/pages are being served. What web server are you using? As an example, I can make nginx + PHP-FPM seriously out per...
Why does multiprocessing use only a single core after I import numpy?
...hine- and task-specific .
Update:
There are also two ways to disable the CPU affinity-resetting behaviour of OpenBLAS itself. At run-time you can use the environment variable OPENBLAS_MAIN_FREE (or GOTOBLAS_MAIN_FREE), for example
OPENBLAS_MAIN_FREE=1 python myscript.py
Or alternatively, if you...
C#位运算符（C#按位与、按位或 等） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...为1的位，新数中相应位为0。
（2）取一个数中某些指定位。
如想要取一个整数a（占2个字节）的低（高）字节，只需将a与八进制的377（177400）按位与即可。
（3）保留某一个数的某一位。
与一个数进行&运算...
那些年 O2O创业我踩了十个坑 - 资讯 - 清泛网 - 专注C/C++及内核技术
...此一来，公司团队看似整齐而豪华，但内部却出现了很多问题，由于大家背景各异，来自于国企、外企和民企，处事风格完全迥异，很多事情在讨论中反复，反复后再讨论，浪费了大量的时间在开会和制定战略中，而且大家的价...
Virtual functions and performance - C++
...curious, so I went ahead and ran some timings on the 3GHz in-order PowerPC CPU we work with. The test I ran was to make a simple 4d vector class with get/set functions
class TestVec
{
float x,y,z,w;
public:
float GetX() { return x; }
float SetX(float to) { return x=to; } // and so on...
Difference between a “coroutine” and a “thread”?
...ple threads may be executing at any given time. (Traditionally, on single-CPU, single-core machines, that concurrency was simulated with some help from the OS -- nowadays, since so many machines are multi-CPU and/or multi-core, threads will de facto be executing simultaneously, not just "conceptual...
了解 Boost Filesystem Library - C/C++ - 清泛网 - 专注C/C++及内核技术
...于处理文件系统操作的库，这一直是 C++ 语言存在的一个问题。过去，程序员必须使用本机 API 来解决此问题。通过本文您将了解一个提供安全、可移植且易用的 C++ 接口来促进文件系统操作的库：Boost Filesystem Library。
创建与...
How can I test a Windows DLL file to determine if it is 32 bit or 64 bit? [duplicate]
...programs, regardless of whether they are compiled for x32 or x32/x64 ("All CPU"). Appears as if every .NET executable has a 32-bit native header, and it calls the appropriate 32-bit or 64-bit .NET runtime when its invoked.
– Contango
Mar 2 '11 at 12:16
...
据说这是一个程序员的手机......... - 轻松一刻 - 清泛网 - 专注C/C++及内核技术
...坏在半路上了。于是两位工程师和一位经理就如何修车的问题展开了讨论。硬件工程师说：“我可以用随身携带的瑞士军刀把车坏的部分拆下来，找出原因，排除故障。”项目经理说：“根据经营管理学，应该召开会议，根据问...