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Static linking vs dynamic linking
...c linking or vice versa in certain situations? I've heard or read the following, but I don't know enough on the subject to vouch for its veracity.
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Join vs. sub-query
...version-specific and query-specific.
Historically, explicit joins usually win, hence the established wisdom that joins are better, but optimisers are getting better all the time, and so I prefer to write queries first in a logically coherent way, and then restructure if performance constraints warr...
Compiled vs. Interpreted Languages
... called (which may be many, many times...). So over time, the JIT compiler wins by a long margin.
– mikera
Sep 17 '13 at 13:47
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libpthread.so.0: error adding symbols: DSO missing from command line
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It's not a gcc option, so either you are missing the -Wl, bit, or you have an linker that does not support this options. What linker are you using? This answer assumes the classic binutils linker(ld.bfd). The binutils gold linker(ld.gold) documents --copy-dt-needed-entries as "Not s...
Is there a way to use shell_exec without waiting for the command to complete?
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On Windows 2003, to call another script without waiting, I used this:
$commandString = "start /b c:\\php\\php.EXE C:\\Inetpub\\wwwroot\\mysite.com\\phpforktest.php --passmsg=$testmsg";
pclose(popen($commandString, 'r'));
Thi...
Pointers vs. values in parameters and return values
...n find situations where copying even large structs turns out a performance win, but the rule of thumb is not to.
For slices, you don't need to pass a pointer to change elements of the array. io.Reader.Read(p []byte) changes the bytes of p, for instance. It's arguably a special case of "treat littl...
detect key press in python?
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I am not sure for linux but it works on Windows for me.
– user8167727
Jun 26 '17 at 6:52
77
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How to write a large buffer into a binary file in C++, fast?
...slow down (lower transfer rates) as they get older (because of non working bits).
I am seeing the code run in 63 secondds.
Thus a transfer rate of: 260M/s (my SSD look slightly faster than yours).
64 * 1024 * 1024 * 8 /*sizeof(unsigned long long) */ * 32 /*Chunks*/
= 16G
= 16G/63 = 260M/s
I get a...
Node.js: How to send headers with form data using request module?
I have code like the following:
5 Answers
5
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How can I quantify difference between two images?
...ion and is much better than any pixel-wise comparison. If there's a little bit of noise in your webcam's image or if the image is shifted by even one pixel, then a direct comparison will pick up all these meaningless changes. A more robust approach would be to compute the discrete cosine transformat...