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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
...：（其中的 α 取值在0.8 到 0.9之间，这个算法英文叫Exponential weighted moving average，中文叫：加权移动平均）
SRTT = ( α * SRTT ) + ((1- α) * RTT)
3）开始计算RTO。公式如下：
RTO = min [ UBOUND, max [ LBOUND, (β * SRTT) ] ]
其...
How do I clear the terminal screen in Haskell?
...the shell command
:! cls under windows
:! clear under linux and OS X
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how to check the jdk version used to compile a .class file [duplicate]
... looking for this on the command line (for a class called MyClass):
On Unix/Linux:
javap -verbose MyClass | grep "major"
On Windows:
javap -verbose MyClass | findstr "major"
You want the major version from the results. Here are some example values:
Java 1.2 uses major version 46
Java 1.3 us...
What's “P=NP?”, and why is it such a famous question? [closed]
...ic polynomial time.
Definitions:
Polynomial time means that the complexity of the algorithm is O(n^k), where n is the size of your data (e. g. number of elements in a list to be sorted), and k is a constant.
Complexity is time measured in the number of operations it would take, as a function of...
Is it safe to use Project Lombok? [closed]
...any bright ideas how to implement it. I mean, just generating a standard text is not that useful. Like getFoo, returns foo, setFoo sets the foo? How is that going to help?
– Roel Spilker
Oct 4 '10 at 7:46
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Is C++ context-free or context-sensitive?
I often hear claims that C++ is a context-sensitive language. Take the following example:
20 Answers
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Auto-expanding layout with Qt-Designer
...
After creating your QVBoxLayout in Qt Designer, right-click on the background of your widget/dialog/window (not the QVBoxLayout, but the parent widget) and select Lay Out -> Lay Out in a Grid from the bottom of the context-menu. The QVBoxLayout s...
Why were pandas merges in python faster than data.table merges in R in 2012?
...eal most of the time spent in the call sortedmatch(levels(i[[lc]]), levels(x[[rc]])? This isn't really the join itself (the algorithm), but a preliminary step.
Recent efforts have gone into allowing character columns in keys, which should resolve that issue by integrating more closely with R's own...
Best practices for API versioning? [closed]
...he users of that API.
Since evolution of an application and, to a lesser extent, its API is a fact of life and that it's even similar to the evolution of a seemingly complex product like a programming language, the URI design should have less natural constraints and it should be preserved over time...
How to get the response of XMLHttpRequest?
I'd like to know how to use XMLHttpRequest to load the content of a remote URL and have the HTML of the accessed site stored in a JS variable.
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