[flac-dev] Performance tests

[MauritsVB]

Hi Martijn,

I don’t know if it’s just my Firefox or whether something breaks during the parsing of the email but none of your links seem to work for me. I feel it might have something to do with the spaces in the file names of the PDFs, which doesn’t translate well to URLs.

Thanks,
Lennard

> On 3 Feb 2016, at 18:04, Martijn van Beurden <mvanb1 at gmail.com> wrote:
> 
> 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.
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