[chuck-users] increase chuck memory usage

[Michael Heuer]

Kassen wrote:

> Michael wrote:
>> Altogether this creates 238 SndBufs, which appears to be more than
>> ChucK can handle.  Sample playback skips, repeats, or is otherwise
>> corrupted.  Removing some of the mappings improves playback.
>
> That's rather a lot! :-)
>
> When I read your mail I suspected that you were connecting all of
> those SndBuf's to the DAC, which would indeed cost quite a lot of CPU
> (only connecting the ones that you need when you need them and
> disconnecting them after that would save a lot in your case)...
> However looking at your file I don't see either a SndBuf or a dac at
> all. Those must be in another file.

Yep, every instance of Sample has a SndBuf chucked to dac

https://github.com/heuermh/lick/blob/deab64e5b1eb1783e9a68bb508a0317c0287bf16/Sample.ck#L105


> So, let's talk about it; do you mean that simply allocating this
> amount of memory causes a large CPU load in and of itself? It
> shouldn't, IMHO only UGens and code  should cost CPU. It could be that
> the garbage collection is going bonkers?

ChucK appears to be hitting one CPU on a two CPU machine pretty hard,
but is only using 305M of RAM.  Overall CPU usage on the machine is
around 55%.


> I don't think memory allocation should do this, at least not once it's
> allocated. 200 mono drumhits doesn't sound like a lot of memory to put
> into the ram of a computer these days, expecting it all to play
> *while* the samples are being pulled from the drive into ram might be
> a bit much.

Good point.  I tried adding a 20 second wait between creating the
BigMono object and all the samples and playing them, to allow for disk
IO, and still get the playback problems.


If anyone wants to play along at home, you'll need to download LiCK
from github and the Big Mono drum kit from here

http://www.analoguedrums.com

and rename the .wav files according to the attached (some files in
bigmono.zip are named incorrectly), or rename some other samples, or
change the file paths in BigMono.ck to match your samples, or
code-reuse by cut and paste BigMono.ck to a different ChucK class to
match your samples.  See e.g.

https://github.com/heuermh/lick/blob/master/RolandTr606.ck

Then

$ chuck --loop &
$ chuck + import.ck
$ chuck + examples/bigMonoDemo.ck

   michael
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