Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.


Messages - webuilddreams

Pages: [1] 2
1
"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

2
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

3
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.

4
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?

5
Any news or findings from the dev team?

6
That is not what I meant, there is nothing faulty with CPU. But that doesn't mean all software can utilize it in same way. How Embree can utilize the hardware depends on many aspects of software stack, from motherboard firmware to OS scheduler. If those things are written for retail SKU, tiny discrepancy can cause misutilization.

Years ago, one of such solutions was upgrading Visual Studio redistributable used for compiling. Just saying it isn't as easy as updating libraries often, though I do hope it is for this particular issue.
Hi Juraj, thanks for your input, we or I am a bit frustrated , spend a small fortune and now this shit, hope the devs solves this soon.

7
I hope solution for your problem is found, but I will like to stress that if in some case you have non-retail stepping (ES/QS/etc..), the issue can be with on-chip memory controller which creates certain spiral of firmware/OS issues that can manifest under certain workloads (whether it's scheduler issues, CPU groups, NUMA nodes, etc..).

So if Corona team received fully retail unit (which in 2024 means all-in-one system for most Epyc stuff), they might not be able to replicate your issue.

It's bit risky proposition to build custom multi-CPU servers today, too many variables with zero support. Super hard to investigate and find what can be culprit.

Not saying that's the case, just be prepared.

Nice to know that Corona devs got the machine though.

Hi we have a single retail Epyc 9754 (so no Numa nodes), we ruled out that the processor (and the whole system) is the culprit:

the slow geometry phase is caused by a particular step 'Embree scene calculation'.

The epyc is in the calculation of the 'Embree scene building' step very slow, 10x slower than for example a ryzen 5900x (12 cores)!

So to rule out that the Epyc cpu is slower when it comes to Embree calculation we want to test this slow Embree scene calculation and we tested it with Embree benchmarked software : phoronix-test-suite benchmark embree, the result was :

AMD Epyc 9754                              : 127 frames/sec
 
Compared to
 
AMD Ryzen Threadripper Pro 7995WX  : 116 frames/sec
 


Conclusion the Epyc is a bit faster in Embree calculations compared to a 7995WX (96 cores) so our system is not the issue, could it be the Embree version inside corona ?( Corona using old embree version?)Intel Embree is currently at version 4.3 do you know what version currently is used in Corona 11.1?


8
We are checking this out :) In fact we just took delivery of a new super high core/thread count dual EPYC machine this week so that we can better investigate any reported issues along these lines.

Great, that would be great, it is also very frustrating to work in interactive rendering(IR): before i can make any change (for example the color materials or move an object) i have to wait until IR finish rendering (max passes) so we put max passes at 5 (btw the thread override IR is set to -16)
We still can use Photoshop and other programs, just max hangs (test this with HF11.1 and 2021.3 and 2024.2)

9
Hi all, we are a step closer to identifing the problem, the AMD Epyc 9754 has a whopping 128 cores and so 256 threads, in the render phase it is fast but in the geometrie phase it is a lot slower compared to our oldest pc (all the scenes have the same issue so it's not scene releated bort pc corone 11.1 and max 2021.3 and max 2024.2):

old pc (ryzen 5900x) win 11 pro (128 gb), geometry phase takes 15 secs
amd epyc 9754 win 11 pro(384 gb), geomtery phase takes 60 sec!!

The difference is in the Embree calculation time (see corona log file in C:\Users\USERNAME\AppData\Local\Autodesk\3dsMax\2021 - 64bit\ENU\en-US\plugcfg\corona) and this does not make any sence : this cpu is one of the fastets where it comes to calculating Embree (https://openbenchmarking.org/test/pts/embree)
So we tested this (the Embree benchmark from github) and we got a nice fast score arround 130 frames per sec: conclusion our pc is fine


So is it possible that one of the core componens of corona render is a bit old?
And does any one have the same problem?

10
Hardware / Re: Dual Epyc 9654 experience?
« on: 2024-03-14, 14:25:16 »
Hi maru, yes we can share this scene, but it happens in all the project i am working on, tested this on 20+ different projects/3dsmax files and in every case it is the same: the geometry phase takes 10 x longer? also compared this with a friend (ryzen 5900x) and his geometry phase was arround 12 x faster (same scenes/projects, tested this with over 10 diff max files) so share?

It would be great to sort it out, and it would help others decide whether to go with 9654/9754. Can you please share the scene with Maru to sort it out?

Yes very happy with it, we use a singel 9754, we did some tests with a double 9654 EPYC, and it turns out that we have an overall speed of 140% compared to a single 9654. With the 9754 we have a speed of 130% compared to 2 x 9654.

11
Hardware / Re: Dual Epyc 9654 experience?
« on: 2024-03-14, 14:19:28 »
Yes, we just did via the ticket.

12
Hardware / Re: Dual Epyc 9654 experience?
« on: 2024-03-12, 14:08:53 »
Hi maru, yes we can share this scene, but it happens in all the project i am working on, tested this on 20+ different projects/3dsmax files and in every case it is the same: the geometry phase takes 10 x longer? also compared this with a friend (ryzen 5900x) and his geometry phase was arround 12 x faster (same scenes/projects, tested this with over 10 diff max files) so share?

13
Hardware / Re: Dual Epyc 9654 experience?
« on: 2024-03-12, 13:41:36 »
Hi Nejc Kilar, we checked it and in de screenshot that was taking during the geomtery phase u see that the core speed is arround 3 GHz and it utilizes 70% of the cores plus the next time we render the same it gets worse, from 0:39 min first time to a stunning 3:05 seconds (after 5 renders same cam) only for the geometry phase!

14
thanks, i start to meassure this:  in the scene parsing corona does in fact uses only a few cores, but in the geometry phase corona uses arround 70% of the cores. The screenshot was taken in the geometry phase.

15
Thanks Pokoy, we load the 3dsmax scene on both pc's local from de D SSD M.2 drives, so that is not an issue, the new pc has a single core speed of 3.08 Ghz and the old pc 4.5 Ghz, that could explane the scene parsing perhaps (but still the old pc single core isnt twice faster only 50%).

I benchmarked all different computer parts (memory , cpu ssd, etc etc) and on all benchmarks the new pc is much faster than the 4 year old cheap pc,

But thanks for thinking with me!

Pages: [1] 2