Extremely slow deletion time for massive amount of objects #53163
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opened 2017-10-25 21:10:09 +02:00 by Alma Talp
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Reference: blender/blender#53163
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System Information
Win 7 64 bit
Blender Version
2.78c
Deleting massive amount of objects is crazy slow; a user suggested to post it as a bug, possibly memory leak?
I made some tests with the same scene in Blender and 3ds Max:
Deletion of ~22.000 objects in Max is 2 minutes and 10 secs.
In Blender I shut it down after 1 and a half hour and let it happen while I was sleeping at night.
I don't know if it is a bug or just the dependency graph's default behavour; hopefully if the last, it will be addressed in 2.8.
Thanks
Changed status to: 'Open'
Added subscriber: @AlmaTalp
Added subscriber: @JoshuaLeung
It is a known issue that Blender does not work that well with a large number of objects. That said, to be able to figure out what may be going on here, it would help to have a few extra pieces of information:
Hello Joshua, thanks.
Infos:
I delete them in the 3d view with the delete keyboard button.
The complexity is various, but most of them could be considered as low-poly/ultra low-poly (but not at the 'box/cube' level low poly).
There are about 4.000 base objects, the remaining number of ofjects are instances of these.
Only modifier is the Triangulate on some of them (not really relevant, like on 2% of the objects). No sims, no particles.
As nodetree I do not know what you mean.
I have tons of addons installed; I don't know if is there an easy way to list them?
What could be relevant - for a short list -:
Scene uses about 10GB.
I use a Radeon RX480 8GB for display and GTX 1070 8GB to render.
Ok. Two other things I forgot to mention:
--factory-startup
option? The factory startup option will disable all addons, and can help us narrow down if it's one of the addons causing problems.Ok. I'm running the factory clean Blender 2.79 test now.
BTW it is a scene I work on from 2.74 with similar problems; I also tested deletion with some 2.80 builds and still no joy, it is slow.
IMHO it is related to known limitations and it would be great to see enhancements here. That is why I tested 2.80, but I haven't seen any yet.
Related to the scene: unfortunately I cannot share it.
Added subscriber: @VukGardasevic
@AlmaTalp to list all the enabled add-ons it's enough to attach the
system-info.txt
generated from theHelp> Save System Info
menu by dragging and dropping the whole .txt file into the comment field (introduced in Blender 2.79).I shut it down again, still not finished. (clean setup)
@Vuk: thanks for the tip.
I made a new test, also here is the link for a testfile I made.
Times:
3ds Max time: 28 sec
Blender 2.79 (clean): 13 minutes 45 secs
Testfile: https://ufile.io/imxw5
Ok, some updates with test file:
Deletion times:
Cinema4D (R19): 15 sec
3DS Max (2012): 30 sec
Maya (2018): 13 min 40 sec
Blender (2.78): 13 min 45 sec
MODO (11): 26-27 min
MODO (9): 40 min
Interesting... we're certainly not the worst here, but there's also cleary some room for improvement too :)
Yep, Cinema and MODO both shocked me (different way).
From Blender aspect the problem is that in real life scenario with my real scene the deletion take hours which is insane.
I create all my contents in Blender and I also import/export 10Ks of objects between apps. A 10x speed up would solve all my problems and put Blender to the top3. As scene organization gets a boost in 2.8 and many of my former issues has been solved in the last years I have a huge trust in Blender's future. :)
BTW the friend of mine who made the MODO test also delivered this data to Foundry to make them think about it!
Added subscriber: @mont29
Changed status from 'Open' to: 'Archived'
Cannot even open your file here, not enough RAM on my laptop…
That being said, having thousands of data-blocks in Blender is known to be an issue, either when adding or removing some (for different reasons). We are aware of the issue, but this is not considered a bug currently, rather a TODO. See e.g. D2910 (which shall solve a lot of the 'add new ID' slowness issue).
Removing being slow has another cause though - the fact that for each ID (object or whatever else) you remove, we have to go over the whole Main database of IDs to check its potential relations with them. Solving that would likely require to add some kind of 'bulk removal' process, nice TODO, but again, not a bug. ;)
Thanks, Bastien.
Do you have any idea when overall performance will be better? Will 2.8 bring change related to this (my former tests did not show improvements).
Thanks!
Currently no, 2.8 has no difference compared to master on this field yet. But if/when such a new development is done, it will most likely happen in 2.8 now, since objects handling is quite different between both branches.
Hello Bastien,
I grabbed the 2.8 beta and made the test process again.
These were the former results:
Deletion times:
Cinema4D (R19): 15 sec
3DS Max (2012): 30 sec
Maya (2018): 13 min 40 sec
Blender (2.78): 13 min 45 sec
MODO (11): 26-27 min
MODO (9): 40 min
The beta deletes the scene in more than 32 minutes what makes Blender 2.8 the SLOWEST among all the 3d applications.
Is there any plan to speed it up to the original level?
(God, I think this the 3rd time when I realize that some very important features were better before 'enhancements' :D )
Ok, it is 2021 almost, the current deletion time is about 24 minutes with Blender 2.91. When will this issue be solved?
Added subscriber: @ChristophWerner
I've the same problem with 2.92. It makes me crazy to wait for deleting objects. I've a complex scene, too.
I don't know why Blender seem to use just one CPU core to delete objects. I have an Ryzen Threadripper with 32 cores... 31 cores does nothing while deleting.
This needs to fixed.
As a reminder, the way to mass-delete a huge anount of objects is to use the Outliner's
Delete
operation (from its right-click menu).Deleting objects from the 3DView does a lot of extra 'smart' processing that will make it extremely slow in case of mass-deletion (or even removing a few objects from a massive collection of those).
Thank you for the reminder, but I do it already via the outliner and it's still slow... And "yes", I have a lot of Collections.
Maybe then a less 'smart' way is better.
The deletion time in 3Ds Max 2012 (!) is 30 sec, in C4D is 15 sec for the very same scene Blender 2.8x needs almost 20 minutes.
Added subscriber: @thierrykobyleski
Added subscriber: @Renderbicks
I actually confirm this issue in Blender 3.5. Deleting takes extremely long. I am not waiting for around 30 minutes and still deleting (or frozen).
Steffen Dünner has a workaround to delete a lot of models within a minute: