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<p>interesting, bela uses this approach!</p>
<p><a class="moz-txt-link-freetext" href="http://bela.io/#about">http://bela.io/#about</a></p>
<p><br>
</p>
<p>so it should not be that hard to adapt it for desktops and
laptops<br>
</p>
<br>
<div class="moz-cite-prefix">On 09/07/2016 08:01 PM, Giulio Moro
wrote:<br>
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<div><span>I believe the solution to these things lies in using
Xenomai or other RT extensions for Linux. With Xenomai you
take control of the scheduler and you can have one process
taking up an entire CPU, while the Linux kernel waits ( or
uses other CPUs).</span></div>
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<div class="qtdSeparateBR">Giulio</div>
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<hr size="1"> <b><span style="font-weight:bold;">From:</span></b>
Jonathan Wilkes via Pd-list
<a class="moz-txt-link-rfc2396E" href="mailto:pd-list@lists.iem.at"><pd-list@lists.iem.at></a><br>
<b><span style="font-weight: bold;">To:</span></b>
Simon Iten <a class="moz-txt-link-rfc2396E" href="mailto:itensimon@gmail.com"><itensimon@gmail.com></a>; Pd-List
<a class="moz-txt-link-rfc2396E" href="mailto:pd-list@lists.iem.at"><pd-list@lists.iem.at></a> <br>
<b><span style="font-weight: bold;">Sent:</span></b>
Wednesday, 7 September 2016, 18:50<br>
<b><span style="font-weight: bold;">Subject:</span></b>
Re: [PD] disable cores on linux to use as dedicated
dsp<br>
</font> </div>
<div class="y_msg_container"><br>
> On Wednesday, September 7, 2016 12:51 PM, Simon
Iten <<a moz-do-not-send="true" shape="rect"
ymailto="mailto:itensimon@gmail.com"
href="mailto:itensimon@gmail.com">itensimon@gmail.com</a>>
wrote:<br clear="none">
<br clear="none">
> hi list,<br clear="none">
<br clear="none">
> i recorded 3 times in a studio last year that
uses a daw/pc <br clear="none">
> interconnection by pyramix, basically it is a
hacked windows system, <br clear="none">
> where one or two cores of a multicore cpu are
completely hidden from the <br clear="none">
> system. these cores are then acessed directly by
the daw and used as a <br clear="none">
> very powerful dsp. the system is incredible!
lowest latencies, high <br clear="none">
> trackcount, and the breakout to the adc/dac is a
simple network cable.<br clear="none">
<br clear="none">
> see here for additional info:<br clear="none">
<br clear="none">
> <a moz-do-not-send="true" shape="rect"
href="http://www.merging.ch/products/pyramix/masscore"
target="_blank">http://www.merging.ch/products/pyramix/masscore</a><br
clear="none">
<br clear="none">
> i since wondered if this would be a way to go for
puredata? at least on <br clear="none">
> linux it seems very easy to deactivate a core
(but i don't know if it <br clear="none">
> than can be used directly by a process) : echo 0
> <br clear="none">
> /sys/devices/system/cpu/cpu1/online for core2 for
example.<br clear="none">
<br clear="none">
<br clear="none">
> is this a completely stupid idea? note that i
have no idea how hard it <br clear="none">
> would be to implement something like this<br
clear="none">
<br clear="none">
<br clear="none">
> thanks for any insight<br clear="none">
<br clear="none">
<br clear="none">
Hi Simon,<br clear="none">
That quite an intriguing design.<br clear="none">
<br clear="none">
It hurts my brain too much to try to assess the
difficulty of such an undertaking to <br clear="none">
refactor Pure Data to this design. <br clear="none">
So let me try a shortcut:<br clear="none">
<br clear="none">
Inside d_ugen.c (which is essentially just dsp algos,
so there should be few if any <br clear="none">
system calls) I see a t_getbytes call. t_getbytes
calls calloc.<br clear="none">
<br clear="none">
With the design you linked to, do Pd devs have to
reimplement malloc? If the answer <br clear="none">
is yes, then I'd call this a massively difficult
undertaking. If d_* relies on the <br clear="none">
system calls, then you can bet x_*, m_*, s_*, and g_*
do, too, and to a much greater <br clear="none">
extent.<br clear="none">
<br clear="none">
If the answer is no, I'd like to learn more about the
design.<br clear="none">
<br clear="none">
-Jonathan<br clear="none">
<br clear="none">
_______________________________________________<br
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