[flac-dev] Performance tests

[Martijn van Beurden]

Op 02-02-16 om 18:22 schreef Martijn van Beurden:
> Op 02-02-16 om 16:54 schreef lvqcl:
>> BTW, 64-bit flac can benefit from 64-bit words in 
>> bitreader/bitwriter routines. Currently it requires 
>> --enable-64-bit-words switch in ./configure parameters. It 
>> would be interesting to test its effect, especially on ARM.
>
> Okay, I might test that as well.

So, here are some performance checks for the 64-bit word change.

http://www.audiograaf.nl/misc_stuff/Comparison 64 bit words 
32-bit ARM (Raspberry Pi).pdf
http://www.audiograaf.nl/misc_stuff/Comparison 64-bit word on 
64-bit Linux (2008 Intel).pdf
http://www.audiograaf.nl/misc_stuff/Comparison 64-bit word on 
64-bit Windows (2014 Intel).pdf

As you can see, both 64-bit systems seem to benefit, but the 
Raspberry Pi suffers slightly. Sadly I do not have any 64-bit 
ARM systems to run these tests on.

I noticed that the improvements seem to increase the faster the 
coding proces is, something it has in common with the 
calculation of the MD5 sum. So, I decided to check whether the 
MD5 sum is the 'source' of this improvement. See the next file

http://www.audiograaf.nl/misc_stuff/Comparison 64-bit word on 
64-bit Windows (2014 Intel) - No MD5 sum.pdf

It turns out it is not in the MD5 sum calculation, otherwise the 
difference should have vanished (or shrunk) on disabling the MD5 
sum calculation.