Chaos Corona for 3ds Max > [Max] Bug Reporting
dual CPU issues?
doillo:
Hello again,
Srr if I am reviving a "dead topic", but after 4 months I have more data to share.
4 months ago, I thought the problem was with my "exotic CPUs", because they are the OEM version (e5-2696v4). I thought that was the problem... So I decided to buy 2 original e5-2699v4 and change them... And surprise... I have the same problem :/
I found a post on the official Autodesk forum (they're old, but I'm pretty sure they haven't fixed it yet) that said 3dsmax can NOT properly handle +64 threats.
In addition, Windows 10 also has some problems with +64 threats... for example, I cannot "set affinity" in task manager and manage the number of threats for a certain application (Windows denies this action if it has more than 64 threats) And TR 3990x is known to have issues with its performance: https://www.anandtech.com/show/15483/amd-threadripper-3990x-review/3
And on top of this, corona is NOT working properly too. There are maps that SINK render performance when I use them (like triplanarTex) or native 3dsmax output or bitmap (and I think there will be more maps for sure).
I'm using corona 6/7 and I don't know if in corona 8 any of this is fixed or at least in a "fix schedule". I know you can not fix 3dsmax maps, but at least, try to fix your own maps like tryplanarTex, and check the others.
I'm still shocked that it took me like a whole year to know what was going on here. Finding almost 0 information on this. And I can not believe nobody is complaining of this.
There is any alternative? Can I render in other OS? do you have Linux render node soft?
simtub:
I've been having some issues getting Corona to run at a decent speed with our new DUAL EPYC Racks systems. Came across this thread and it has given me a bit more knowledge over the issues pertaining.
We thought it was a Windows 11 issue too and just upgraded to Windows 11 Pro Workstation Edition which handles up to 4 CPU's and 6TB Ram (We have Dual EPYC's at 64C 128T with Total Core count of 256 and 256GB Ram) But it seems Corona is still rendering slower than many of the benchmarks on out there on the Corona Benchmark Page and also CPU Utilization jumps up and down during rendering time.
--- Quote from: doillo on 2022-03-01, 22:35:10 ---Hello again,
Srr if I am reviving a "dead topic", but after 4 months I have more data to share.
4 months ago, I thought the problem was with my "exotic CPUs", because they are the OEM version (e5-2696v4). I thought that was the problem... So I decided to buy 2 original e5-2699v4 and change them... And surprise... I have the same problem :/
I found a post on the official Autodesk forum (they're old, but I'm pretty sure they haven't fixed it yet) that said 3dsmax can NOT properly handle +64 threats.
In addition, Windows 10 also has some problems with +64 threats... for example, I cannot "set affinity" in task manager and manage the number of threats for a certain application (Windows denies this action if it has more than 64 threats) And TR 3990x is known to have issues with its performance: https://www.anandtech.com/show/15483/amd-threadripper-3990x-review/3
And on top of this, corona is NOT working properly too. There are maps that SINK render performance when I use them (like triplanarTex) or native 3dsmax output or bitmap (and I think there will be more maps for sure).
I'm using corona 6/7 and I don't know if in corona 8 any of this is fixed or at least in a "fix schedule". I know you can not fix 3dsmax maps, but at least, try to fix your own maps like tryplanarTex, and check the others.
I'm still shocked that it took me like a whole year to know what was going on here. Finding almost 0 information on this. And I can not believe nobody is complaining of this.
There is any alternative? Can I render in other OS? do you have Linux render node soft?
--- End quote ---
simtub:
Some updates on our experience with a DUAL CPU system
On our Dual EPYC node, we realised that 4 x 64Gb Dimm configuration was the issue. Supposedly on a Single CPU, filling 4 Dimm slots would enable the system to run in Quad Channel but since we have 2 CPU's then 4 Dimms is just a Dual Channel Memory set up and we would need 8 Dimms for Quad Channel or 16 Dimms for 8-Channel Memory set ups. (Our school boy error when setting out the original specifications).
So it seems Corona is much more bandwidth dependent on the number of memory channels much more so than Vray and Cinebench. When we ran benchmarks for Vray and Cinebench in Dual Channel, the scores were very good and matched to other systems of similar spec. It was only Corona that had issues, Dual Channel Ram literally halved the performance on the Corona Benchmark giving us around 20seconds where as Quad Channel gave a respectable 11 seconds. I suspect 8-Channel may push the Corona benchmark to 8-9 seconds but we don't have enough Ram to test this.
Other things we considered to resolve this speed issue before switch the RAM were:
- Upgrading to Windows Pro 11 Workstation Edition (This version can run more CPU's and RAM than Windows 11 Pro but it didn't affect our case even with 128 Cores and 256 Threads)
- Turning off Virtualization (Didnt really do much)
- Turning off VBS, Core Isolation and Memory Integrity on Windows (Didn't really do much)
- Power Plan on High Performance (Both in Windows and BIOS - Not sure how this affects the system performance as yet)
- NUMA settings on BIOS (Not yet looked into it)
- Windows Updates and latest BIOS
Hope this can help others out there configuring Dual Socket Systems. I would be interested to know from the Corona Development team why there is such a dramatic performance difference between DUAL and QUAD/8 Channel RAM configs as Vray doesn't have this issue at all.
Cheers.
doillo:
Oh my god!
I just assume my RAM was working in quad channel (octo in 2 slots), using 4 sticks per cpu (8 in total). In fact, typical monitor software tells me my RAM is working in quad-channel, but I didn't try to populate all dimms (cos My boards have 16 slots!).
I will try this solution but I have to buy RAM to check it cos I don't have 16 RAM sticks...
andrew1988:
have you found the sollution in the end ?
I have some issue with you with my new build dual XEON 8480+
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