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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.
...
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
2
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Fastest way to check if string contains only digits
...
Can be about 20% faster by using just one comparison per char and for instead of foreach:
bool isDigits(string s)
{
if (s == null || s == "") return false;
for (int i = 0; i < s.Length; i++)
if ((s[i] ^ '0') > ...
Best way to determine user's locale within browser
...F3 on Ubuntu 8.10) reports 'en-GB'. If someone is still using IE6 - around 20% of people - then it's worth allowing for that. IE6 appeared 8 years ago.
– Phil H
Mar 23 '09 at 18:43
...
Gzip versus minify
...), 68K (only JSMin), 23K (only gzip), to 19K (JSMin + gzip). That's about 20% saved due to minification.
– Deepak
Sep 27 '12 at 22:04
1
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ios app maximum memory budget
...ed. In my experience, I've had to keep memory much lower to be safe, maybe 20% of what's shown here. Device-to-device differences are also highly variable.
– user1021430
Aug 10 '15 at 19:24
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Android map v2 zoom to show all the markers
... For better-looking padding, use height instead of width and take 20% instead of 10% of it.
– noob
Jul 31 '17 at 8:50
3
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