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Ignore files that have already been committed to a Git repository [duplicate]
... community wiki
13 revs, 13 users 20%takeshin
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Benchmarking small code samples in C#, can this implementation be improved?
...se terms that is really loaded. sometimes having an implementation that is 20% faster is significant, sometimes it has to be 100 times faster to be significant. Agree with you on clarity see: stackoverflow.com/questions/1018407/…
– Sam Saffron
Jun 26 '09 at 5...
Picking a random element from a set
...ince index < set.size(), that check is unnecessary overhead. I saw a 10-20% boost in speed, but YMMV. (Also, this compiles without having to add an extra return statement.)
Note that this code (and most other answers) can be applied to any Collection, not just Set. In generic method form:
publi...
Refactoring in Vim
...an actual IDE would perform better for most users. I'd be thinking on a 80-20% kind of situation (even more, with the balance in favor of the IDE).
– Cutberto Ocampo
Sep 22 '15 at 16:41
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How to access session variables from any class in ASP.NET?
... the application re-starts. Note, by performance cost we are looking at a 20% premium in using State Server mode, and serialization costs are added on top of that. As you can imagine this can get expensive. You can avoid some of the serialization overhead by sticking to primitive types (e.g. int,...
Do spurious wakeups in Java actually happen?
...s on a signal that there is a message in the queue.
In busy periods, up to 20% of the wakeups are spurious (ie when it wakes there is nothing in the queue).
This thread is the only consumer of the messages.
It runs on a Linux SLES-10 8-processor box and is built with GCC 4.1.2.
The messages come fro...
Creating an R dataframe row-by-row
...Internals that there is a memory structure where the storage increments by 20%. Either way, growth operations occur with logarithmic frequency relative to the total number of elements appended. On an amortized basis, this is usually acceptable.
As tricks behind the scenes go, I've seen worse. ...
How to elegantly rename all keys in a hash in Ruby? [duplicate]
...ormance considerations:
Based on the Tin Man's answer, my answer is about 20% faster than Jörg W Mittag's answer for a Hash with only two keys. It may get even higher performance for Hashes with many keys, specially if there are just a few keys to be renamed.
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原子vector的一种实现源码(atomic-vector) - C/C++ - 清泛网 - 专注C/C++及内核技术
...原版链接
源码依赖Facebook的folly库，稍加适配改成了独立运行的版本，代码比较简单，实现分配好空间，然后对元素进行原子交换，扩容采用链表的形式，代码可直接运行。
测试代码：
HPHP::AtomicVector<float> v_atom(2, 0.f);
void a...
What is a deadlock?
...ving a long process. Thread B waiting to lock resource A. CPU time usage : 20%, can you consider that a deadlock situation?
– rickyProgrammer
Sep 28 '17 at 16:37
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