[Flac] 1.21 vs 1.3 encoding speed

[Scott Brown]

I forgot to post to this list yesterday, so here's my latest email to the
dev list:

--------- Forwarded message ----------
From: Scott Brown <scottcbrown at gmail.com>
Date: Sun, Jul 27, 2014 at 8:16 AM
Subject: Re: [flac-dev] 1.21 vs 1.3 encoding speed
To: Martijn van Beurden <mvanb1 at gmail.com>
Cc: flac-dev at xiph.org


Adding -O3 now has these results:

51.81 seconds for the file that took 222 seconds without -O3. So that was
it.

Thank you!

Scott


On Sat, Jul 26, 2014 at 3:47 AM, Martijn van Beurden <mvanb1 at gmail.com>
wrote:
op 25-07-14 19:32, Scott Brown schreef:
> ./configure -enable-static -disable-shared CFLAGS=" -isysroot
> /Developer/SDKs/MacOSX10.6.sdk -mmacosx-version-min=10.6"
> make

Well, the use of CFLAGS 'disables' the -O3 and unroll-loops
optimisation. I'm quite sure that's the culprit. Add -O3 to your
CFLAGS and it should be fixed.

See the following lines in the configure script

>         if test "x$user_cflags" = x; then
>             CFLAGS="-O3 -funroll-loops -Wall -W -Winline"
>         fi

Maybe we should change this 'overriding' behaviour of CFLAGS and
add -O3 just like most other options are added to the CFLAGS?

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On Sat, Jul 26, 2014 at 11:38 AM, <dathead2 at gmail.com> wrote:

> Please cc: the results from dev list back here though
>
> I would run some tests on a diff platform but don't have access to my PC
> for a few weeks
>
> Would also be interesting to see what decoding stats you get
>
> On Jul 25, 2014, at 7:38 AM, Scott Brown <scottcbrown at gmail.com> wrote:
>
> I will post to the dev list, sorry about that.
>
> To give an idea, though, at flac level 8:
>
> 24/96 wav file
> 1.21: 61.05 seconds. ratio=0.690
> 1.3: 222.48 seconds. ratio=0.690
>
> smaller 16/44.1 wav file
> 1.21: 14.28 seconds. ratio=0.487
> 1.3: 51.21 seconds. ratio=0.487
>
> Scott
>
>
> On Fri, Jul 25, 2014 at 2:39 AM, <dathead2 at gmail.com> wrote:
>
>> Are you sure they didn't change the default encoding level ?
>>
>> I would include some example timings to give a better idea of what
>> "significantly slower" is
>>
>> Wonder if you see same for 44/16 files?
>>
>> On Jul 25, 2014, at 2:29 AM, Martijn van Beurden <mvanb1 at gmail.com>
>> wrote:
>>
>> Hi,
>>
>> You might want to report this to the flac-dev mailinglist instead of the
>> flac (users) list.
>>
>> op 24-07-14 22:02, Scott Brown schreef:
>>
>>   Hello,
>>
>>  I'm on a Mac and I'm noticing that encoding via the flac command line is
>> significantly slower with version 1.3.0 than 1.2.1. I'm encoding a 24/96
>> file to flac, both from wav and aiff and both formats are showing the same
>> speed decrease when using 1.3.0.
>>
>>  Also, 1.2.1 will not encode an aiff-c file, but 1.3.0 will. Is this
>> change documented anywhere?
>>
>>  Thanks,
>> Scott
>>
>>
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