Very slow geometry phase 10x slower than old pc

[TomG]

News or findings will show up in a daily build as a "we hope this fixes...." ;) Or if something comes up where we'd appreciate a test "if you disable this in the BIOS..." or similar. So that is when it all becomes relevant for folks to test things - up until then while we are testing internally, there won't be any news.

[gmh_2001]

There seems to be a pattern here with high core/thread machines -see my threadripper post. My cinnebench scores were great on a 64 core machine and disappointing real world performance with corona 11...

[TomG]

Yep, we are aware of the patterns - I say patterns as we do know there is more than one thing going on.

[Byteman3D]

This is a frustrating but expected result, as @Pokoy stated, the more cores a system has, the slower single threaded operations will be.

I vaguely remember an old CPU single performance chart from Tom's Hardware website.

With a list of many high end products starting from 1 core 1 thread Pentium 4 3gHz, this CPU was the slowest of all processors in multicore benchmark and number fastest in single threaded.

I also experience this a lot and makes me feel pessimistic about our profession. That's why I work with my 4 Cores laptop until it is rendering time. It is definitely more responsive during viewport operations than the 24 Core Xeon one.

[hrvojezg00]

I am also checking on this. It is crucial to get info on whether dual CPU systems will be better optimized or not.

[webuilddreams]

News or findings will show up in a daily build as a "we hope this fixes...." ;) Or if something comes up where we'd appreciate a test "if you disable this in the BIOS..." or similar. So that is when it all becomes relevant for folks to test things - up until then while we are testing internally, there won't be any news.

Hi TomG, is it possible that the whole series 9004 is affected (the Zen 4) by the problem 'ít takes 10 x longes to make the embree calculation' ? And is there any news from the dev team?

[TomG]

It is possible the entire series is affected (when run in dual CPU set ups), as they all fit into the "dual CPU, high thread/core count". It's still under investigation, tracking down the actual cause is tricky here as the "obvious" candidates were ruled out some time ago and that leaves it as something much more unusual.

[webuilddreams]

It is possible the entire series is affected (when run in dual CPU set ups), as they all fit into the "dual CPU, high thread/core count". It's still under investigation, tracking down the actual cause is tricky here as the "obvious" candidates were ruled out some time ago and that leaves it as something much more unusual.

Thanks, but i run a single AMD Epyc 9754 and am also affected.... any update on when the dev team expect this to solve and e.g. is the threadripper pro 7995wx also affected since this is an overclocked 9654?
If this is not solved soon i sell my rig with a write off of atleast 4K!
 I consider to sell my current setup since i dont get any responds from the helpdeks on when this is solved , very very unhappy with the lack of responds from the helpdek!!
And the question remains what cpu's are functioning properly for corona, is there any list?

Sorry for this bit hard words , am a bit frustrated, i sepnd 20K on a new pc and cant really use it, it is so slow especially in IR.

[TomG]

For single CPU high thread core counts, the problem was isolated some time back and the fix moved into the dailies https://forum.corona-renderer.com/index.php?topic=41598.msg221510#msg221510 Those machines are now scaling in performance as we would expect. Only dual CPU systems remain with some extra issue.

The list is, with Corona 12 dailies, every CPU is working unless you are running dual CPUs with more than 64/128 cores/threads.

PS, I have also confirmed with support that they are regularly responding to you, so not sure why you believe there is a lack of response?

[webuilddreams]

For single CPU high thread core counts, the problem was isolated some time back and the fix moved into the dailies https://forum.corona-renderer.com/index.php?topic=41598.msg221510#msg221510 Those machines are now scaling in performance as we would expect. Only dual CPU systems remain with some extra issue.

The list is, with Corona 12 dailies, every CPU is working unless you are running dual CPUs with more than 64/128 cores/threads.

PS, I have also confirmed with support that they are regularly responding to you, so not sure why you believe there is a lack of response?

sorry tom, but the issue is NOT fixed, they geometrie phase (and in particularly the Embree calculation) takes way to long (up to 5 minutes in simple scenes), the rendering phase is as fast as i expect

[maru]

I have left a note in the support ticket. I suggest we continue over there. Of course, when there will be some important information to share (e.g. the solution), sharing it on the forum is a good idea.

[Juraj]

I am watching this with interest and I have some partial off-topic note. The up-coming Windows build, that will be public in September I think, but is already in fast-track beta public test (not sure which channel that is but probably ISO is available to everyone), 24H2 comes with completely new (process/core) scheduler. I do wonder if this might help our situation as well? At least a bit?

I am debating whether to test this myself, but I don't have much time or patience currently with very busy life.

The worst performance with high-core machines in general work is 3dsMax/Corona while doing IR. The rendering performance is as expected (the Ray/s metric), but every other process (Material editor refresh, Precomp phasing, etc..) is perceivably slower at same time.

Once again, not to de-track from above issues, just wondering if it could be additional piece of puzzle. Windows Scheduler was always big weak point for high-core machines.

[webuilddreams]

"The worst performance with high-core machines in general work is 3dsMax/Corona while doing IR. The rendering performance is as expected (the Ray/s metric), but every other process (Material editor refresh, Precomp phasing, etc..) is perceivably slower at same time."

Yes that is also an additional problem, but my problem is that the calculation of the Embree takes extemly long(up to 5 mins in older machines only seconds),the rendering itself is very fast