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Performance of Arrays vs. Lists
...e.
The bounds checking is often no big deal (especially if you are on a cpu with a deep pipeline and branch prediction - the norm for most these days) but only your own profiling can tell you if that is an issue.
If you are in parts of your code where you are avoiding heap allocations (good exam...
Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?
...lers like clang choose not to use reciprocal + Newton for scalar on recent CPUs, because it's usually not faster. In most loops, div isn't the only operation, so total uop throughput is often the bottleneck even when there's a divps or divss. See Floating point division vs floating point multiplic...
What is the memory consumption of an object in Java?
... memory alignment done by a particular JVM implementation for a particular CPU type. It looks like a Long is 8 bytes of Object overhead, plus 8 bytes more for the actual long value. In contrast, Integer had an unused 4-byte hole, most likely because the JVM I use forces object alignment on an 8-byte...
关于php的socket初探 - PHP - 清泛IT论坛，有思想、有深度
...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...
Fastest way to flatten / un-flatten nested JSON objects
...ntrol in JS (i.e. you're at the mercy of the browser) 2) if you want to do CPU intensive work then JS is not the best language. Consider using C instead. There are JSON libraries for C
– Aadit M Shah
Oct 6 '13 at 16:51
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How to get the return value from a thread in python?
...it(f, *args, **kwargs))
return wrap
Then, whenever you need to push cpu intensive or blocking code off the event loop thread, you can put it in a decorated function:
@threadpool
def some_long_calculation():
...
# this will suspend while the function is executed on a threadpool
result = ...
How do I limit the number of results returned from grep?
...finds the first 10 lines it looks like he continues thinking and "using my cpu" and just not printint it is it correcT? thansk
– Jas
Feb 16 '11 at 6:36
6
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Dictionary vs Object - which is more efficient and why?
What is more efficient in Python in terms of memory usage and CPU consumption - Dictionary or Object?
8 Answers
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Different floating point result with optimization enabled - compiler bug?
... Different optimization levels affect how often floating point values from CPU get saved into memory and thus rounded from 80-bit precision to 64-bit precision.
Use the -ffloat-store gcc option to get the same floating point results with different optimization levels.
Alternatively, use the long d...
Running a cron every 30 seconds
... schedule the next run to coincide with other events, it needs to wake the CPU less often. The 1ms in the example above is not ideal - I usually set accuracy to 1 (1 second) in my sub-minute scheduled jobs, but that would mean that if you look at the log showing the "Hello World" messages, you'd see...