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再说WCF Data Contract KnownTypeAttribute - 更多技术 - 清泛网移动版 - 专注C/C++及内核技术
...列化器去寻找未知对象的映射的途径。在Remoting中这样的问题不会存在，因为Remoting实际上是通过将一个类型传递给双方来进行类型匹配的。
那么KnowTypeAttribute到底用在什么地方呢？上边说了，当前类的未知类型。那什么又是当...
What exactly are “spin-locks”?
...lly short, because your thread now has to wait for a preemption to receive CPU time again.
Besides, kernel objects are not available in every state of the kernel, such as in an interrupt handler or when paging is not available etc.
Spinlocks don't cause preemption but wait in a loop ("spin") till th...
What's the Android ADB shell “dumpsys” tool and what are its benefits?
...m information in a simple string representation.
Possibility to use dumped CPU, RAM, Battery, storage stats for a
pretty charts, which will allow you to check how your application
affects the overall device!
What information can we retrieve from dumpsys shell command and how we can use it
If you ...
How to make execution pause, sleep, wait for X seconds in R?
...(x)
{
p1 <- proc.time()
Sys.sleep(x)
proc.time() - p1 # The cpu usage should be negligible
}
testit(3.7)
Yielding
> testit(3.7)
user system elapsed
0.000 0.000 3.704
share
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What is the purpose of XORing a register with itself? [duplicate]
...it the fastest way it knows. A bit operation like XOR might take only one CPU cycle, whereas a copy (from one register to another) can take a small handful.
Often compiler writers will even have different behaviors given different target CPU architectures.
...
John Carmack's Unusual Fast Inverse Square Root (Quake III)
...ng result, until required accuracy is met. This is exactly how it works in CPU/FPU! But it seems that only one iteration was enough, which was also a blessing for the speed. CPU/FPU does as many iterations as needed to reach the accuracy for the floating point number in which the result is stored an...
开源邮件传输代理软件 -- Postfix 介绍 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...。还有一种情况时，如果postfix在处理邮件过程中遇到了问题，则该值会开始降低。
当接收到的新邮件的数量超过postfix的投递能力时，postfix会暂时停止投递deferred队列中的邮件而去处理新接收到的邮件。这是因为处理新邮件的...
How do you determine the ideal buffer size when using FileInputStream?
...mum buffer size is related to a number of things: file system block size, CPU cache size and cache latency.
Most file systems are configured to use block sizes of 4096 or 8192. In theory, if you configure your buffer size so you are reading a few bytes more than the disk block, the operations wit...
C语言结构体里的成员数组和指针 - C/C++ - 清泛网 - 专注C/C++及内核技术
...问0x4的内存地址，不crash才怪。于是，你一定会有如下的问题：
1）为什么不是 13行if语句出错？f.a被初始化为空了嘛，用空指针访问成员变量为什么不crash？
2）为什么会访问到了0x4的地址？靠，4是怎么出来的？
3）代码中的...
What is a coroutine?
...t? If it is right, it is just like an un-preemptive OS running on one-core CPU, one process must relinquish CPU to let other tasks run.
– Nan Xiao
Jun 22 '16 at 12:18
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