Quick Fur particles enter in infinite loop and crash #65228
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Reference: blender/blender#65228
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Windows 10 64 bits - Compiled last source code at 28/05/2019 10:35:00
I have done some debug and I have seen the time is used in the following functions:
We have tested in two different PCs and it's only compiling the last source code, but not using the buildbot of today.
Added subscriber: @antoniov
Added subscriber: @WilliamReynish
@WilliamReynish @brecht Could you test in Mac/Linux ?
Added subscribers: @OscarNebeAbad, @juang3d
I tested today's master in windows, i7-5960x, without problem:
version: 2.80 (sub 72), branch: blender2.7, commit date: 2019-05-27 19:48, hash:
89207df722But @antoniov y @OscarNebeAbad tested the same and they get hangs
Also tested master recently build on linux mint, without trouble, in the 2990WX, it's a weird behaviour
BTW: those two are two different pc's from the ones mentioned by Antonio
I have seen the problem is only using "Quick Fur". If you add the particle system, set to hair and 200.000 works.
I tested on today Win 64 build on i7 7700HQ, and also happens to me. Even I got 1 particle on screen if I create just 1million or 4million particles in it.
Added subscriber: @brecht
It seems the problem is related to children generation, when trying to generate 100.000 particles * 10 children on viewport it hangs
It seems that the same thing worked fin in 2.79, the problem seems to be related to child particles
ok, so in 2.8 is also working, so this may be just the result of having faster particle creation and now having a much slower children creation, which in reality it's not slower, it's that now it's more obvious, I'm not sure, still doing some more tests though
It seems to be related to some kind of capping, with 100.000 particles * 100 interpolated children all CPU's are being used ina multithreaded task, while with 100.000 * 10 interpolated children it seems that is not running the multithreading, so it's doing a single threaded task
100.000 * 100 inteprolated:
100.000 * 10 interpolated:
Added subscriber: @JacquesLucke
Added subscriber: @ZedDB
I can't reproduce the infinite loop and crash. Is this still an issue?
Changed status from 'Open' to: 'Archived'
I think we can archive because the reason in the children particles and the number is very high. Really, this is more a ToDo to improve Child particles creation and multithreading, but not a bug.
@juang3d and I were looking at the code but we have not found the problematic lines yet.
Yes, I have not found the problem yet, still looking at particles code when I have some time, I would like to do some proper debug and profiling as Antonio did to find if I found the bottleneck, but I don't think it's a bug, it's just something to be improved.