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How to write a large buffer into a binary file in C++, fast?
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Yes. From my experience, smaller buffer sizes are usually optimal. The exception is when you're using FILE_FLAG_NO_BUFFERING - in which larger buffers tend to be better. Since I think FILE_FLAG_NO_BUFFERING is pretty much DMA.
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Best way to determine user's locale within browser
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From MDN developer.mozilla.org/en-US/docs/Web/API/NavigatorLanguage/… "The Accept-Language HTTP header in every HTTP request from the user's browser uses the same value for the navigator.languages property except for the ex...
CGContextDrawImage draws image upside down when passed UIImage.CGImage
...DrawImage would be drawing my image upside down? I am loading an image in from my application:
18 Answers
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How to mount a host directory in a Docker container
...er, the reason you don't see anything is that you are mounting a directory from boot2docker, not from your host.
You basically need 2 successive mounts:
the first one to mount a directory from your host to your system
the second to mount the new directory from boot2docker to your contain...
Why does the order of the loops affect performance when iterating over a 2D array?
...ter? All memory accesses are the same, right?
No: because of caches. Data from your memory gets brought over to the CPU in little chunks (called 'cache lines'), typically 64 bytes. If you have 4-byte integers, that means you're geting 16 consecutive integers in a neat little bundle. It's actually f...
How to differ sessions in browser-tabs?
...of accounts stored in cookies, google mail is just storing all cookies and select one according to the url.
– Mhmd
Oct 25 '14 at 0:57
5
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Why is there huge performance hit in 2048x2048 versus 2047x2047 array multiplication?
...umber of cache lines in your cache. L is always power of 2.
The six comes from fact that 2^6 == 64 bytes is standard size of cache line.
Now what does this mean? Well it means that if I have address X and address Y and
(X >> 6) - (Y >> 6) is divisible by L (i.e. some large power of 2)...
multiprocessing: How do I share a dict among multiple processes?
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A general answer involves using a Manager object. Adapted from the docs:
from multiprocessing import Process, Manager
def f(d):
d[1] += '1'
d['2'] += 2
if __name__ == '__main__':
manager = Manager()
d = manager.dict()
d[1] = '1'
d['2'] = 2
p1 = Proce...
How to use subprocess popen Python
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subprocess.Popen takes a list of arguments:
from subprocess import Popen, PIPE
process = Popen(['swfdump', '/tmp/filename.swf', '-d'], stdout=PIPE, stderr=PIPE)
stdout, stderr = process.communicate()
There's even a section of the documentation devoted to helping use...
How can I output the value of an enum class in C++11
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@NicolBolas: I copied as_integer from one of my open-source libraries, CxxReflect (see enumeration.hpp). The library uses trailing return types consistently, everywhere. For consistency.
– James McNellis
Jul 10 '12 at...