[PD] denormals from [cyclone/svf~] on Linux 64 bit

[katja]

Hi Hans, thanks for your response. I don't consider [bsaylor/svf~] a
good alternative, it has aliasing noises with some settings. Oddly, I
have a simplified version of [cyclone/svf~] (lopass only) which does
work well in Linux 64 bit. So one way or another I should be able to
fix [cyclone/svf~]. Not at first sight however.

Katja

On 2/26/13, Hans-Christoph Steiner <hans at at.or.at> wrote:
>
> I, for one, am very happy that you post on denormal issues!  Its great to
> have
> these hard technical details worked out so that they don't trip us up in
> future works :)
>
> On my Linux Mint Maya 64-bit machine, I get about 3% CPU before it hits the
> denormal, then about 11% CPU.  Hitting 1 jumps it back down to 3%.
>
> Is it worth trying bsaylor/svf~?  I don't know if it works better in this
> situation.  I don't think cyclone has gotten many 64-bit fixes.  As part of
> the Pd-extended 0.43.4 release, I did do a push to fix a lot of 64-bit
> issues
> related to GUI stuff, but there are still a number of cyclone objects that
> do
> not have proper 64-bit array support.
>
> .hc
>
> On 02/26/2013 04:26 PM, katja wrote:
>> Since last week I have my own Linux 64 bit machine. One of the first
>> issues with Pd-extended on this machine was a strongly increased CPU
>> load when audio input is temporarily shut off from parts of my patch.
>> Subnormals! After three hours of puzzling I identified at least one
>> offender: [cyclone/svf~].
>>
>> Sorry that most of my posts to this list seem to be about subnormals.
>> That's quite boring. But they're seriously hogging my CPU time like a
>> swarm of grasshoppers. As I got this 64 bit machine so recently I
>> don't know if the issue with [cyclone/svf~] exists in earlier Pd-E
>> versions. Also, I can not understand why it happens, because the
>> object is protected against subnormals with function PD_BIGORSMALL().
>> This works well on all my other systems. Moreover, it works well for
>> other feedback delay objects like [lop~] on Linux 64 bit.
>>
>> I'd like to know if anyone can confirm the issue. I was planning to do
>> my own state variable filter anyway, but it would be nice to have a
>> working [cyclone/svf~] as well. Check the object with attached patch
>> if you can. To be specific, I have the issue with Pd-E 0.43.4 for
>> Debian Squeeze amd64 from nightly builds. The i386 build is not
>> affected.
>>
>> Katja
>>
>>
>>
>> _______________________________________________
>> Pd-list at iem.at mailing list
>> UNSUBSCRIBE and account-management ->
>> http://lists.puredata.info/listinfo/pd-list
>>
>
> _______________________________________________
> Pd-list at iem.at mailing list
> UNSUBSCRIBE and account-management ->
> http://lists.puredata.info/listinfo/pd-list
>