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Parallelism with VEX Wrangles

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austinb
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Joined: June 2018
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I have noticed that when I set up a VEX wrangle to run over primitives, it only executes on one thread.

I'm currently running this code as a test, and just cranking up the count channel. Flipping between primitive and point, while watching my processors run in htop shows that in point mode it runs on all threads, while in primitive mode it only runs on one.

float num = 0.0;
f@noise = 0.0;

for (int i=0; i<chi("count"); ++i) {
    num += random(i*@primnum);
    f@noise += xnoise(num);
}

Is this a limitation of VEX wrangles, and if so is there a workaround?
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MrReedSmith
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Joined: Sept. 2013
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Maybe use the opencl node?
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jsmack
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It's multi threaded for all run over modes, other than ‘detail.’ However, there is a minimum workorder size before it will ask for another thread. I believe it is around 1024 elements required per each additional thread.
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old_school
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Joined: July 2005
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How many primitives?
If it's less than 1000 primitives, it may run in only one thread…
There's at least one school like the old school!
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