[erlang-questions] Managing a huge binary file
Tue Apr 30 14:08:55 CEST 2013
2013/4/30 Magnus Henoch <magnus@REDACTED>:
> Salvador Tamarit <stamarit@REDACTED> writes:
>> I have been trying to solve this problem with different solutions, but
>> I always get stucked in reading the file. I'm reading it sequentally.
>> I open the file with:
>> then I read each number with:
>> file:read(FDevice, 4)
>> this works fine, but too slow.
> Try opening the file with:
> file:open(FileName,[binary, raw, read_ahead])
> I just wrote a little escript that reads four bytes at a time, and
> adding 'raw' and 'read_ahead' seems to make it twice as fast (1.5 s vs 3
> s for a 2 MB file). Interestingly, read_ahead alone didn't make a
> difference, and raw alone actually made it slower.
Twice fast only changing these options... :o
Unfortunately, It still take a lot of time to read the file :P
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