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What is the meaning of “__attribute__((packed, aligned(4))) ”
...the word size, which increases the system's performance due to the way the CPU handles memory.
To align the data, it may be necessary to insert some meaningless bytes between the end of the last data structure and the start of the next, which is data structure padding.
gcc provides functionality...
What is the difference between float and double?
...sion respectively C/C++ long double is far more variable depending on your CPU, compiler and OS. Sometimes it's the same as double, sometimes it's some system-specific extended format, Sometimes it's IEEE quad precision.
– plugwash
Feb 8 '19 at 5:27
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Maximum number of threads per process in Linux?
...work to do is going to slow you down as they're fighting for the available CPU time)
What are you doing where this limit is even relevant?
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Should I use char** argv or char* argv[]?
... says: argv is a non-null pointer pointing to at least 5 char*'s
// allows CPU to pre-load some memory.
int main(int c, char *argv[static 5]);
// says: argv is a constant pointer pointing to a char*
int main(int c, char *argv[const]);
// says the same as the previous one
int main(int c, char ** c...
How to extract img src, title and alt from html using php? [duplicate]
...ar image"
)
)
[..]
)
)
Regexps are CPU intensive so you may want to cache this page. If you have no cache system, you can tweak your own by using ob_start and loading / saving from a text file.
How does this stuff work ?
First, we use preg_ match_ all, a fun...
Exclude a sub-directory using find
...example but find is still iterating into the directory structure and using cpu cycles to iterate over all those directories/files. to prevent find from iterating over those directories/files (maybe there are millions of files there) then you need to use -prune (the -prune option is difficult to use ...
How do I split a string so I can access item x?
...
This works but allocates a lot of memory and wastes CPU.
– jjxtra
May 26 '15 at 16:56
2
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Sharing a result queue among several processes
...iprocessing import Pool
def busy_foo(i):
"""Dummy function simulating cpu-bound work."""
for _ in range(int(10e6)): # do stuff
pass
return i
if __name__ == '__main__':
with Pool(4) as pool:
print(pool._outqueue) # DEMO
results = [pool.apply_async(busy_foo...
Pandas read_csv low_memory and dtype options
...loading (but none after loading is complete) and theoretically saving some cpu cycles (which you won't notice since disk I/O will be the bottleneck.
– firelynx
Sep 1 '16 at 11:22
5...
Redis is single-threaded, then how does it do concurrent I/O?
...cient storage engine like Redis is very often the network, well before the CPU. Isolated event loops (which require no synchronization) are therefore seen as a good design to build efficient, scalable, servers.
The fact that Redis operations are atomic is simply a consequence of the single-threaded...