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关于我们 · App Inventor 2 中文网,少儿编程陪伴者

...一名学生,升级VIP会员后,可以随时随地在线编程,遇到问题提问都能及时得到详细解答,我的App开发技能得到了极大的提升!另外,我享受到VIP学生价格优惠,非常划算! ...
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C++静态和多态,亦敌亦友 - C/C++ - 清泛网 - 专注C/C++及内核技术

...平共存,时而协同工作。 老规矩,还是一小段代码提出问题,当一个虚成员函数(多态性)在其子类中被声明为静态成员函数时(或相反过来),会发生什么? 1、当虚函数遭遇静态函数 #include <iostream> using namespace std; cla...
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Maven: how to do parallel builds?

When you build with maven on a multicore / multi-CPU machine it would often be possible to build different subprojects in parallel. Is there a way to do this with maven? Is there a plugin for this / whatever? ...
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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...
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从一个开发的角度看负载均衡和LVS - 更多技术 - 清泛网 - 专注C/C++及内核技术

...允许的情况下我们会采用软负载,软负载解决的两个核心问题是:选谁、转发,其中最著名的是LVS(Linux Virtual Server)。 三、软负载——LVS LVS是四层负载均衡,也就是说建立在OSI模型的第四层——传输层之上,传输层上有...
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为什么我们程序员写不出好代码? - 杂谈 - 清泛网 - 专注C/C++及内核技术

...提交的仓库里。如果代码行数都计算在内的话,原本一个问题只需10行代码即可解决,程序员有可能编写5000行代码,来让功能更加灵活和兼容,这样,他的代码总量就会增加5000行了。 衡量生产力反而会使代码变的更糟,让项目...
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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...
https://www.tsingfun.com/it/cpp/2214.html 

服务器保持大量TIME_WAIT和CLOSE_WAIT的解决方法 - C/C++ - 清泛网 - 专注C/C++及内核技术

...的处理方法混为一谈,以为优化系统内核参数就可以解决问题,其实是不恰当的,优化系统内核参 数解决TIME_WAIT可能很容易,但是应对CLOSE_WAIT的情况还是需要从程序本身出发。现在来分别说说这两种情况的处理方法: 1.服务...
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Why is processing a sorted array slower than an unsorted array?

...e accessed in memory-order. They have been allocated consecutively in RAM. CPUs love accessing memory sequentially because they can speculatively request the next cache line so it will always be present when needed. When you are sorting the list you put it into random order because your sort keys a...
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kernel stack and user space stack

...sable, and therefore will require one set under its own control. Different CPU architectures implement this in different ways; x86 CPUs automatically switch stackpointers when privilege mode switches occur, and the values to be used for different privilege levels are configurable - by privileged cod...