[PD] shmem and bigger buffer size
iftah gabbai
ift.gab at gmail.com
Mon Feb 10 13:04:17 CET 2020
thanks Christof, unfortunately increasing the delay is not an option for
me,
when you suggest to spread the op across several dsp ticks you mean for
example not to read the buffer in one go but to break the read to chunks?
also, is there a way to "defer low" different tasks in pd?
On Mon, Feb 10, 2020 at 12:53 PM Christof Ressi <info at christofressi.com>
wrote:
> > when i setmem /dumpmem on a 5760000 samples size buffer
>
> Are you trying to do this in a single DSP tick? This would create a CPU
> spike and lead to audio dropouts, depending on the value of "delay" in the
> audio settings.
>
> You can either
>
> a) increase "delay" -> more latency -> more chance to "absorb" CPU spikes,
> or
>
> b) spread the operation across several DSP ticks.
>
> Christof
> On 10.02.2020 12:38, iftah gabbai wrote:
>
> so i tested it with linux and it works great, my only problem right now is
> that i get an audible glitch when i setmem /dumpmem on a 5760000 samples
> size buffer, i tried breaking the setting / dumping to smaller chunks but
> it only got worse, is there any workaround?
>
> thanks!
>
> On Sat, Feb 1, 2020 at 11:44 AM cyrille henry <ch at chnry.net> wrote:
>
>> yes, I did write that. But Miller implemented a binary transfer from pd
>> to pd~ so the native solution must be lot's more efficient now. I did not
>> test if shmem is still faster.
>>
>> Yes, using shmem_send~ and shmem_receive~ will add 1 more block latency
>> on top of pd~ latency.
>>
>> cheers
>>
>>
>> Le 01/02/2020 à 10:32, iftah gabbai a écrit :
>> > @cyrille, i have another question if i may, i saw somewhere in the list
>> that you write that streaming audio from pd to a subprocess with shmem is
>> much more efficient in terms of cpu usage, is it still the case? also if i
>> understand correctly from the docs i will then have latency of one block
>> size + fifo right?
>> >
>> > On Sat 1. Feb 2020 at 10:29, iftah gabbai <ift.gab at gmail.com <mailto:
>> ift.gab at gmail.com>> wrote:
>> >
>> > @chris, thank you for that, very good piece of info!
>> >
>> > On Fri 31. Jan 2020 at 20:03, cyrille henry <ch at chnry.net <mailto:
>> ch at chnry.net>> wrote:
>> >
>> >
>> >
>> > Le 31/01/2020 à 18:30, iftah gabbai a écrit :
>> > > so it is confirmed to work on linux? if so than great :)
>> > it's working on my computer!
>> > c
>> >
>> >
>> > >
>> > > On Fri 31. Jan 2020 at 13:58, cyrille henry <ch at chnry.net
>> <mailto:ch at chnry.net> <mailto:ch at chnry.net <mailto:ch at chnry.net>>> wrote:
>> > >
>> > > I don't know why it fail on mac. You can try to split in
>> smaller table, like you suggested.
>> > > But you should also test it on linux first since it's
>> your main target.
>> > >
>> > > c
>> > >
>> > > Le 30/01/2020 à 19:55, iftah gabbai a écrit :
>> > > > im building on mac os 10.12 and intending to run on
>> linux(arm), i haven’t tested on linux, the problems im having are on mac,
>> > > >
>> > > > thanks!
>> > > >
>> > > > On Thu 30. Jan 2020 at 17:47, cyrille henry <
>> ch at chnry.net <mailto:ch at chnry.net> <mailto:ch at chnry.net <mailto:
>> ch at chnry.net>> <mailto:ch at chnry.net <mailto:ch at chnry.net> <mailto:
>> ch at chnry.net <mailto:ch at chnry.net>>>> wrote:
>> > > >
>> > > > what is your OS?
>> > > >
>> > > > Le 30/01/2020 à 17:10, iftah gabbai a écrit :
>> > > > > hey C, i have 16gb of ram, and if i did not
>> completely messed up my calcs i tried to allocate 2 min of 96khz
>> (11.520.000)
>> > > > >
>> > > > > thanks again!
>> > > > >
>> > > > > On Thu 30. Jan 2020 at 17:06, cyrille henry <
>> ch at chnry.net <mailto:ch at chnry.net> <mailto:ch at chnry.net <mailto:
>> ch at chnry.net>> <mailto:ch at chnry.net <mailto:ch at chnry.net> <mailto:
>> ch at chnry.net <mailto:ch at chnry.net>>> <mailto:ch at chnry.net <mailto:
>> ch at chnry.net> <mailto:ch at chnry.net <mailto:ch at chnry.net>> <mailto:
>> ch at chnry.net <mailto:ch at chnry.net> <mailto:ch at chnry.net <mailto:
>> ch at chnry.net>>>>> wrote:
>> > > > >
>> > > > > hello,
>> > > > >
>> > > > > Do you have enough free memory on your
>> computer?
>> > > > > I just test on y computer, I can reproduce
>> this error as soon as I ask an allocation bigger than the available memory
>> on my hardware.
>> > > > > (between 500 000 000 and 1 000 000 000
>> points)
>> > > > >
>> > > > > cheers
>> > > > > Cyrille
>> > > > >
>> > > > > Le 30/01/2020 à 12:11, iftah gabbai a
>> écrit :
>> > > > > > ...perhaps i should elaborate, im
>> trying to dump an array in the size of 11 520 000(2 min of 96 khz audio) to
>> another instance of PD, is it possible at all or do i have to break it to
>> smaller chunks?
>> > > > > >
>> > > > > > On Thu, Jan 30, 2020 at 12:01 PM iftah
>> gabbai <ift.gab at gmail.com <mailto:ift.gab at gmail.com> <mailto:
>> ift.gab at gmail.com <mailto:ift.gab at gmail.com>> <mailto:ift.gab at gmail.com
>> <mailto:ift.gab at gmail.com> <mailto:ift.gab at gmail.com <mailto:
>> ift.gab at gmail.com>>> <mailto:ift.gab at gmail.com <mailto:ift.gab at gmail.com>
>> <mailto:ift.gab at gmail.com <mailto:ift.gab at gmail.com>> <mailto:
>> ift.gab at gmail.com <mailto:ift.gab at gmail.com> <mailto:ift.gab at gmail.com
>> <mailto:ift.gab at gmail.com>>>> <mailto:ift.gab at gmail.com <mailto:
>> ift.gab at gmail.com> <mailto:ift.gab at gmail.com <mailto:ift.gab at gmail.com>>
>> <mailto:ift.gab at gmail.com <mailto:ift.gab at gmail.com> <mailto:
>> ift.gab at gmail.com <mailto:ift.gab at gmail.com>>> <mailto:ift.gab at gmail.com
>> <mailto:ift.gab at gmail.com> <mailto:ift.gab at gmail.com <mailto:
>> ift.gab at gmail.com>> <mailto:ift.gab at gmail.com <mailto:ift.gab at gmail.com>
>> <mailto:ift.gab at gmail.com <mailto:ift.gab at gmail.com>>>>>> wrote:
>> > > > > >
>> > > > > > hello all, ive been experimenting
>> with shmem (the latest one i could find in deken), it works fine as long as
>> i use very small arrays, as soon as i try to use bigger arrays ( havent
>> checked where the breakpoint is but more than approx 400000) it doesnt and
>> it returns "could not allocate shmem memory Id"
>> > > > > >
>> > > > > > i wonder if im doing something
>> wrong or if its a known thing?
>> > > > > >
>> > > > > >
>> > > > > > thanks!
>> > > > > >
>> > > > > >
>> > > > > >
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