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关于php的socket初探 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...程来处理的 IO 模型，但是效率相对比较差，也很容易出问题，所以暂时不做介绍了）。在这些多路复用的模式中，异步阻塞/非阻塞模式的扩展性和性能最好。
引入阻塞/非阻塞,、同步/异步比喻很形象的一段话：
有A，B，C，D...
Can two different strings generate the same MD5 hash code?
...ed attacker can produce 2 colliding assets in a matter of seconds worth of CPU power. So if you want to use MD5, make sure that such an attacker would not compromise the security of your application!
Also, consider the ramifications if an attacker could forge a collision to an existing asset in you...
Redefining NULL
... work required to avoid dereferencing NULL (assuming that in your case the CPU isn't helping) is the same no matter how NULL is defined, so it's easier to leave NULL defined as zero, and make sure that zero can't ever be dereferenced from C.
...
Executing periodic actions in Python [duplicate]
...foo (1421705503.5810)
Note that this example includes a simulation of the cpu doing something else for .3 seconds each period. If you changed it to be random each time it wouldn't matter. The max in the yield line serves to protect sleep from negative numbers in case the function being called takes...
How can you profile a Python script?
... run:
profile euler048.py
And I get this:
1007 function calls in 0.061 CPU seconds
Ordered by: standard name
ncalls tottime percall cumtime percall filename:lineno(function)
1 0.000 0.000 0.061 0.061 <string>:1(<module>)
1000 0.051 0.000 0.051 0.000 ...
When to use enumerateObjectsUsingBlock vs. for
...ly faster, but that doesn't matter much in most cases — few programs are CPU-bound, and even then it's rare that the loop itself rather than the computation inside will be a bottleneck.
A simple loop also reads more clearly. Here's the boilerplate of the two versions:
for (id x in y){
}
[y enum...
Why is the Android emulator so slow? How can we speed up the Android emulator? [closed]
...TANT NOTE: Please first refer to the Intel list about VT to make sure your CPU supports Intel VT.
HAXM Speeds Up the Slow Android Emulator
HAXM stands for - "Intel Hardware Accelerated Execution Manager"
Currently, it supports only Intel® VT (Intel Virtualization Technology).
The Android emulat...
What is the relative performance difference of if/else versus switch statement in Java?
...re could be some performance gains, if the code is part of the performance CPU graph.
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Parsing JSON with Unix tools
...f a parser that has to support recursion, and in this case, spends lots of CPU building trees for structures you don't care about. (If someone wrote a finite state transducer that did proper (depth-limited) JSON parsing, that would be fantastic! In the meantime we have "grep -o".)
To write maint...
UIView Infinite 360 degree rotation animation?
...n the animation at each PI/2 angle (90 degrees) and a marginal increase in CPU usage over the chosen answer using CABasicAnimation. The CABasicAnimation method produces a flawlessly smooth animation.
– Arjun Mehta
Feb 28 '14 at 18:59
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