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bpftrace教程【官方】 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
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List changes unexpectedly after assignment. How do I clone or copy it to prevent this?
... use the timeit module. also, you can't conclude much from arbitrary micro benchmarks like this.
– Corey Goldberg
Mar 31 '18 at 21:29
3
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Multiprocessing: How to use Pool.map on a function defined in a class?
...rictions on what sort of functions pool.map could accept. I wrote the following to circumvent this. It appears to work, even for recursive use of parmap.
from multiprocessing import Process, Pipe
from itertools import izip
def spawn(f):
def fun(pipe, x):
pipe.send(f(x))
pipe.clo...
Use of #pragma in C
.... As per jalfs comments, data that is aligned on a 4 byte boundary for 32 bit processors or 8 byte boundary for 64 bit processors will typically be loaded and stored in a single operation. Data that is aligned on smaller boundaries will take multiple operations to load or store. This is slower.
...
WCF - How to Increase Message Size Quota
...I read on another blog that the maximum size is 2147483647. 20000000 is a bit smaller than this number, so using the smallest number you can get away with without interrupting service makes sense.
– proudgeekdad
Oct 7 '10 at 16:22
...
Using module 'subprocess' with timeout
...ond one the
process was terminated (return code -15).
I haven't tested in windows; but, aside from updating the example
command, I think it should work since I haven't found in the
documentation anything that says that thread.join or process.terminate
is not supported.
...
Why use AJAX when WebSockets is available?
...unctionality. But for low-latency bi-directional communication it's a huge win.
– kanaka
May 7 '14 at 16:21
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Xcode iOS project only shows “My Mac 64-bit” but not simulator or device
This just started happening that my iOS project is only showing "My Mac 64-bit" rather than the Simulator or my iPhone to build to. I have no idea why this is happening. I do not think that I have changed anything.
...
UnicodeDecodeError: 'utf8' codec can't decode byte 0xa5 in position 0: invalid start byte
...
Since UTF-8 is back-compatible with the oldschool 7-bit ASCII you should just encode everything. For characters in the 7-bit ASCII range this encoding will be an identity mapping.
– Tadeusz A. Kadłubowski
Mar 6 '14 at 7:47
...
内存优化总结:ptmalloc、tcmalloc和jemalloc - 操作系统(内核) - 清泛网 - ...
...程同样在<32KB的时候无锁使用线程本地cache。
Jemalloc在64bits系统上使用下面的size-class分类：
Small: [8], [16, 32, 48, …, 128], [192, 256, 320, …, 512], [768, 1024, 1280, …, 3840]
Large: [4 KiB, 8 KiB, 12 KiB, …, 4072 KiB]
Huge: [4 MiB, 8 MiB, 12 MiB, …]
smal...