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.exr Thumbnail generation causes computer to Freeze for 10 - 30 min
Open, Needs Information from UserPublic


System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce GTX 1050 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.86

Blender Version
Broken: version: 2.81 (sub 13), branch: master, commit date: 2019-10-04 22:33, hash: rBab519b91b2c4
Worked: (optional)

Short description of error

Folder full of .EXR Environment maps that are 20 to 70 mb each
The thumbnail generation of these freezes my PC for 10 - 20 min as it generates them.
Windows doesn't freeze when generating them though.

in Blender 2.79 it crashes.

I'm not sure if this can be helped.

Exact steps for others to reproduce the error

Open Blender 2.81 or 2.80

Shader editor > World > Environment Texture > Open > Browse to a folder containing around 10 .exr images of 20 - 70 mb each > Switch to Thumbnail view.

*PC slows down and eventually freezes for 10 - 20 min as it generates the thumbnails.



Event Timeline

In 2.81 I loaded Factory Defaults, opened the folder and Blender crashed.

I've experimented and found that:

Introducing 2-3 .exr's at a time to Blenders file browser loads them fine without crashing
However, trying to load 15 of them at once in a Folder either freezes the PC or crashes blender

I think the Solution would be to limit .exr thumbnail generation to 2-3 at a time and not all at once.

Bastien Montagne (mont29) lowered the priority of this task from Needs Triage by Developer to Needs Information from User.Thu, Oct 10, 5:33 PM

Hrmmmm… A modern computer should be able to read more than two or three EXRs at a time, especially reasonably "small" ones… How many threads do you have on your CPU? and how many RAM?

I have a Ryzen 5 1600 6 cores and 12 threads
And 16 gig Ram DDR4

Well, that would be 12 (or 13) EXRs opened at the same time… I’d have a hard time believing that could eat all of your 16 GB of ram…

What happens if you try to open 12 of those EXRs simultaneously in viewers e.g.? How many RAM does that takes?

Unfortunately I'm not sure how to get rid of the generated thumbnails
I can't test them in any Blender versions anymore.

I've tried to Disk Cleanup the Thumbnails but it did not affect the .EXR's in Blenders File Browser.

I was asking to open those EXRs in another application, like an image viewer, 12 at once. To check whether your computer is able to handle that many EXR reading or not (Blender does nothing more than that, but with 12 threads it might do 12 at once).

Opened 12 of them in Gimp, PC did slow down a bit, Task manager froze for a while
Then it was fine after

Not sure but maybe it's my Hardrive that cant keep up? its just a normal HDD from 3 years ago or so.

All I know is that in any Blender version when I tried to load the thumbnails of entire folder of massive EXR's my PC froze for a long time every time, until I started testing it with only 3 - 5 of them at a time and it then worked

So I'm just not sure if it's my Hardware or not. These specific EXR's are pretty large and its the first time that happened.