Decline in performance, an increase of over 209% in the rendering
Closed, ResolvedPublic

Description

System Information
Lubuntu 16.04 Intel HD 5500
Ram 4GB

Blender Version
Broken: ( 2.78.4 d426c335c5)
Worked: (2.78c e92f2352830)

Hi, with the latest build there was a noticeable decrease in performance, I hope you all come back as fast as before.

Details

Type
Bug

Hi, can you please add your test file?
Did you check with official benchmark files from blender.org?
https://www.blender.org/download/demo-files/

Mib

Here the test with the BMW model, even with this scene shows a considerable increase in the rendering time with CPU.

CPU Blender : 2.78c e92f2352830
RenderTime 24:02.50

CPU Blender : 2.78.4 d426c335c5
RenderTime 42:40.21

While with my little GTX750Ti there is a slight increase in speed.

GPU Blender : 2.78c e92f2352830
RenderTime 09:32.60

GPU Blender : 2.78.4 d426c335c5
RenderTime 08:56.60

Can you please attach your system info?

Blender --> Info Editor --> Help --> System info.

Looking at our own tests: https://brechtvl.github.io/cycles-ci/ there is not that big of a slow down maybe ~5seconds so the bug might be with a particular cpu kernel.

Here the details of my system.

hmm... CPU device capabilities returned nothing. Can you try with factory settings, both testing performance and the system-info?

Aaron Carlisle (Blendify) triaged this task as "Incomplete" priority.Apr 8 2017, 8:03 PM

Factory settings doesn't affect CPU device capabilities as far as I know.

This is using a 32bit daily build, I guess the 2.78c you're comparing with was also 32 bit? If so, perhaps it's related to rBced8fff5de0f.

@Brecht Van Lommel (brecht) Hi, I don't use a 32bit version, below the test asked me to do, with factory settings and info.


The system info indicates you are using a 32 bit version (i686) though, so I think you might have downloaded the wrong build from builder.blender.org?

@Brecht Van Lommel (brecht) you're right, now I download the new of today, do not know how the hell did I go wrong, I'm sorry to have made you waste time unnecessarily I apologize strongly.

Aaron Carlisle (Blendify) closed this task as "Resolved".Apr 8 2017, 9:29 PM
Aaron Carlisle (Blendify) claimed this task.

No problem, thanks for testing. Still kind of interesting that the 32 bit build is so much slower.