Messages

1

[C4D] Bug Reporting / Re: Dual cpu speed problems

« on: 2025-06-19, 13:22:32 »

Hi, any news on the speed issue without corona bitmaps? Just tested the 13th corona and the issue remains(
I have several systems now:
5950х (16core\32threads) - аll ok
3970x (32\64) - all ok
3990x (64\128) - the problem is present( But if you limit the number of threads in cinema to 64, then everything is ok.  This may be related to the Windows scheduler (if the system has a large number of core\threads, it splits them into 2 groups). But in 3d max this problem was not there, and in corona bench all ok.
(in dual cpu system with xeon`s - everything is like 3990x system)

Is the only solution - still to use the corona bitmap ?

2

[C4D] Bug Reporting / Re: Dual cpu speed problems

« on: 2024-02-22, 19:39:02 »

Interesting, as this is the "Dual cpu speed problems" thread ;)

Yes))

I have a system with a dual processor, but I thought that switching to a high-performance single-processor system would help me, but as it turned out, I have the same problem))

P.S. on my system with 5950x (16 cores/32 threads) everything is fine.

3

[C4D] Bug Reporting / Re: Dual cpu speed problems

« on: 2024-02-22, 18:02:20 »

The fix is for high core count single CPU machines - we're still investigating potential issues on high core count multi-CPU systems. Thanks!

In this case, this is a single-processor system, I specifically attached the task manager, where you can see that it is 3990x (64 cores/128 threads). There is no way to test it on a dual-processor system right now.

4

[C4D] Bug Reporting / Re: Dual cpu speed problems

« on: 2024-02-22, 16:44:31 »

I saw in the latest daily build “Improved performance of Corona renderer with bucket rendering on high-core count machines”, I tested it, nothing has changed compared to the release version of the 11th corona. Still bad speed without corona bitmap, the difference in the number of rays is enormous

5

[C4D] Bug Reporting / Re: Dual cpu speed problems

« on: 2024-02-07, 12:16:22 »

Hello, I found out about one feature of Windows, maybe this is the problem?

"Windows supports more than 64 logical cores, and they are divided into groups to perform tasks more efficiently. A logical core can be either a separate processor in a socket, or a physical CPU core or SMT thread.

During boot, the operating system creates groups of logical processors, but their number cannot exceed 64 in one group. If there are more cores, then two groups are created. In the case of 32 cores/64 threads or a CPU with fewer cores, there are no problems - there is one group. But in the case of 65++ threads there are two groups.

On systems with 64 or fewer logical cores, applications run smoothly because Windows associates them with the same group. If there are two groups, then the tasks are alternately assigned to the first or second group. And an application can only access its group's threads - unless it recognizes multiple groups. Thus, the application must be able to work with several groups of logical cores. If there is no such support in the application, then the number of logical cores is limited to 64, and processor resources are not fully used."

6

[C4D] Bug Reporting / Re: Dual cpu speed problems

« on: 2024-01-19, 13:22:34 »

disapppointed

Disappointed is this...

I switched to 3990x, and here I have the same problem as with the dual socket...(mayby sees this as gluing together two processors ((8+8)+(8+8)) + ((8+8)+(8+8)) ). I have to use bitmaps so that there is no loss of speed (many thanks to the guy who made the conversion script).

7

[C4D] Corona Goodies - User Contributions / Re: Bitmap shader conversion scripts

« on: 2023-12-25, 12:07:08 »

Wow, thanks a lot!

Now we need to wait for the developers to fix the bug with bitmap+ transformation in layer shader

8

[C4D] Bug Reporting / Re: Dual cpu speed problems

« on: 2023-12-09, 22:50:34 »

Hi, I just tested the 11th corona, there is still a problem with the speed on 2 socket systems ((

Is there any progress with this problem?

9

[C4D] Feature Requests / Re: Corona Bitmap as the standard texture shader

« on: 2023-11-30, 12:24:20 »

This is a really good idea, perhaps it would solve the problem with two processor systems in corona+c4d.

10

[C4D] Bug Reporting / Re: Dual cpu speed problems

« on: 2023-06-30, 17:12:27 »

yes i can test them.

Hi, this is a very simple scene
https://drive.google.com/file/d/1bBznCFUIdCMLZeKV94bprGh-G9VdNyCQ/view?usp=sharing

Here are the test results on my system.
1) Without the corona bitmap, two processors work completely, the performance is about 5m rays.



2) Without corona bitmap, one processor works, because of the Windows 11 scheduler it does not divide perfectly, as it was in Windows 10, but the performance is higher, about 6m+ rays.


3) With corona bitmap, one processor works, because of the Windows 11 scheduler it does not divide perfectly, as it was in Windows 10, but the performance is already much higher, about 9m+ rays. (on win10 with one processor there is no difference with or without bitmap, on win11 there is still a problem due to the fact that the system still divides the load between two processors)


4) With corona bitmap, two processors work, everything is fine, correct performance, about 13m rays.


(my 5950x system gives about 16m rays)

I also tested physical materials, the situation is similar in everything.

Thank`s.

11

[C4D] Bug Reporting / Re: Dual cpu speed problems

« on: 2023-06-27, 21:20:58 »

"The problem is textures (without corona bitmap) and dual-processor configuration. "

what i meant in short, that i not can reproduce that on my dual machines. so you might have some specific problem.
i hope the corona team finds what is  causing this for you.

People in two of my topics complained about the same problems.

What xeons do you have? Maybe in newer generations that do not have this problem on socket 3647 or newer?

I will put together two test scenes in the coming days (with and without corona bitmaps). Can you test them and share the results?

12

[C4D] Bug Reporting / Re: Dual cpu speed problems

« on: 2023-06-27, 19:14:54 »

Thanks, we do have it reported indeed.
Which versions of Corona and C4D are you using?
Also, which OS and version? 
And lastly, what are your exact hardware specs? What CPU model, how much RAM, what RAM configuration? (2 RAM sticks or more) Are you 100% sure that your RAM is installed correctly according to the motherboard manual?

I am sorry if you have already answered those questions in the past, but if you could do it once again, that would be great.

Corona 3-10 (yes, all versions from 3 to last 10)
C4D R16-R23
Windows 7-10-11 different versions

cpu`s: 2x intel xeon e5-2698v4
ram tested with different configurations, 1-8 pieces


" 100% sure "
Yes, with pc all ok. In 3dsmax+corona ALL OK. In C4D standart render ALL OK. In C4D+corona, but without textures (grey geometry render) ALL OK too.
If use team render, same problem.

The problem is textures (without corona bitmap) and dual-processor configuration.

13

[C4D] Bug Reporting / Re: Dual cpu speed problems

« on: 2023-06-27, 16:40:52 »

Please report this as a support ticket here: https://support.chaos.com/hc/en-us/requests/new
Please attach any scene where you are able to reproduce the problem and add information about the version of Corona and Cinema 4D you are using, and the hardware you are using.

Hi,
I sent a report and a scene back in 2021... nothing has changed during this time.
Someone from the corona team wrote in this thread

"thanks for reporting, we have logged it internally at (Internal ID=743369807)"

14

[C4D] Bug Reporting / Re: Dual cpu speed problems

« on: 2023-06-27, 16:17:33 »

"well i think i did read the thread."

If you do not understand the problem, then you did not look carefully ((

15

[C4D] Bug Reporting / Re: Dual cpu speed problems

« on: 2023-06-27, 16:16:34 »

well i think i did read the thread.

i do not use corona bits , or only rarely. speed is ok with our without here.
i have quite some Corona render experience, and it works very well for most things with the classic c4d bitmap.

modern systems (also single cpu threadrippers) can be 2x or even 3x and more faster than old dual xeon as you or i have,
best compare the cinebench values for example of both machines (to have a neutral comparance), so there a 2x speed difference is expected.

EDIT: on cinebench 15, the xeon you have a score of 2940 points, where the single threadripper has, dependent on model scores between 6000 and 10400 points, and intel i9 13900 has still more than 6000 points, more than double the speed as the dual xeons ( and i think it is valid to compare amd and xeons for render tasks, it is all about speed, amd cpus are just most times faster today for rendering)

this is due the progress modern cpus have made last years.

Why are you writing here about the difference between old xeons and new other processors? Topic about it?

I have a 5950x system, it is in terms of rendering speed like my system with two xenons. I use the xeon system as a node, but I can only use 50% of its capabilities.
Dual processor systems can give a lot of performance, and I have a desire to build a few more nodes, but this bug severely limits it.


"i have quite some Corona render experience, and it works very well for most things with the classic c4d bitmap."

I didn’t just write that the bug was described back in 2019 ... But it’s still not working.