<html><head></head><body><div style="font-family: Verdana;font-size: 12.0px;"><div>here's an alternative implementation which uses no additional memory allocations but is more invasive: https://github.com/pure-data/pure-data/pull/347
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<div style="margin:0 0 10px 0;"><b>Gesendet:</b> Freitag, 06. April 2018 um 14:41 Uhr<br/>
<b>Von:</b> "Jonathan Wilkes via Pd-list" <pd-list@lists.iem.at><br/>
<b>An:</b> pd-list@lists.iem.at, "Dan Wilcox" <danomatika@gmail.com><br/>
<b>Betreff:</b> Re: [PD] suggestion: $0 in messages</div>
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<div class="ydp2011be50yahoo_quoted" id="ydp2011be50yahoo_quoted_3997065447">On Friday, April 6, 2018, 6:24:13 AM EDT, Giulio Moro via Pd-list <pd-list@lists.iem.at> wrote:
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<div>> I don't think it makes sense to have a malloc() and free() for each call to a msg box.<br clear="none"/>
> Pd is already not very real-time friendly, why make it worse?<br clear="none"/>
> There could be ...<br clear="none"/>
> - statically allocated memory for t_gstack y in pd_pushsym</div>
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<div>But you can nest arbitrarily deep in patch loading, no?</div>
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<div>Also, patch loading time typically doesn't need to happen in realtime, as</div>
<div>you're also allocating memory for objects during that time plus probably</div>
<div>taking an i/o hit when loading abstractions.</div>
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<div>On the other hand, it would be interesting to use a memory pool like you</div>
<div>mention below and see its effect on load time. At least for the "canvas" field</div>
<div>of data structures in Purr Data I cache the binbuf so there's no i/o hit</div>
<div>there, only memory allocations.</div>
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> - a pre-allocated memory pool meant for short-lived memory allocations to be used in real-time critical cases like this. If no memory available from the pool, only then allocate it (or allocate a new pool). There are probably other cases around the codebase where this would make sense, but why not starting with this?</div>
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<div>I'd measure performance here first to determine the best course of action.</div>
<div>Even with a memory pool pd_pushsym is doing quite a few assignments. Pushing</div>
<div>and popping on every msg box method may get be noticeably different than</div>
<div>dereferencing a single cached value.</div>
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<div>Measuring [trigger] performance I could see differences depending on how</div>
<div>exactly the loop for the outlets was constructed.</div>
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<div>-Jonathan</div>
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> Giulio<br clear="none"/>
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On Thursday, 5 April 2018, 22:54:44 BST, Jonathan Wilkes via Pd-list <<a href="mailto:pd-list@lists.iem.at" onclick="parent.window.location.href='pd-list@lists.iem.at'; return false;" target="_blank">pd-list@lists.iem.at</a>> wrote:<br clear="none"/>
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> On Thursday, April 5, 2018, 3:20:03 PM EDT, Dan Wilcox <<a href="mailto:danomatika@gmail.com" onclick="parent.window.location.href='danomatika@gmail.com'; return false;" target="_blank">danomatika@gmail.com</a>> wrote:<br clear="none"/>
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> test? <a href="https://github.com/pure-data/pure-data/pull/346" target="_blank">https://github.com/pure-data/pure-data/pull/346</a><br clear="none"/>
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That will add a malloc/free for every method call to a msg box. So<br clear="none"/>
I'd measure the performance impact before using that<br clear="none"/>
implementation.<br clear="none"/>
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On the l2ork dev list I mentioned a potential way to cache the glist<br clear="none"/>
in the t_messresponder to avoid allocation at message evaluation time.<br clear="none"/>
But we haven't implemented that yet (nor measured the current<br clear="none"/>
performance hit).<br clear="none"/>
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-Jonathan<br clear="none"/>
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--------<br clear="none"/>
Dan Wilcox<br clear="none"/>
@danomatika<br clear="none"/>
danomatika.com<br clear="none"/>
robotcowboy.com<br clear="none"/>
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