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TCP 的那些事儿（下） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...后接收端再把这个ack回来时再记一个t1，于是RTT = t1 – t0。没那么简单，这只是一个采样，不能代表普遍情况。
经典算法
RFC793 中定义的经典算法是这样的：
1）首先，先采样RTT，记下最近好几次的RTT值。
2）然后做平滑...
Why do pthreads’ condition variable functions require a mutex?
I’m reading up on pthread.h ; the condition variable related functions (like pthread_cond_wait(3) ) require a mutex as an argument. Why? As far as I can tell, I’m going to be creating a mutex just to use as that argument? What is that mutex supposed to do?
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Is Java really slow?
Java has some degree of reputation for being slow .
19 Answers
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Why doesn't Java offer operator overloading?
...ng from C++ to Java, the obvious unanswered question is why didn't Java include operator overloading?
16 Answers
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How to install GCC piece by piece with GMP, MPFR, MPC, ELF, without shared libraries?
How do I install GCC (the GNU Compiler Collection) piece by piece, using the current version,
using the correct versions of dependencies, not using a package manager (like yum, rpm, apt, dpkg), and not using shared libraries?
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Is JavaScript a pass-by-reference or pass-by-value language?
The primitive types (number, string, etc.) are passed by value, but objects are unknown, because they can be both passed-by-value (in case we consider that a variable holding an object is in fact a reference to the object) and passed-by-reference (when we consider that the variable to the object hol...
Why is auto_ptr being deprecated?
I heard auto_ptr is being deprecated in C++11. What is the reason for this?
5 Answers
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Node.js vs .Net performance
...e.js being fast and able to accommodate large amounts of load. Does anyone have any real world evidence of this vs other frameworks, particularly .Net? Most of the articles i've read are anecdotal or don't have comparisons to .Net.
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OPTION (RECOMPILE) is Always Faster; Why?
I encountered an odd situation where appending OPTION (RECOMPILE) to my query causes it to run in half a second, while omitting it causes the query to take well over five minutes.
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Text size and different android screen sizes
I know, it was discussed already 1000 times, but I can't adjust the text size for different screen sizes. I try to use 'sp' as size units in my custom style:
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