Corona Renderer for 3ds Max > [Max] Bug Reporting

dual CPU issues?

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I answer a C4D post cos I have similar issue than an user posted, but I have not noticed the post was in c4d forum, and my issue is at 3dsmax.
Im going to open new threat here:

I have 2 computers one with Asus z10pe-d16 ws motherboard with 2x e5-2696v4 (88 threats). And my other computer is a e5-2678v3 (24 threats)

At several benchmarks, the dual system is more than 3 times powerfull than the single cpu computer (cinebenchR15, cinebenchR20, cinebenchR23, coronabenchmark 1.3...)

But when I'm rendering with corona DR (3dsmax 2021.3 and corona 6.2), dual system makes only 1.1~1.2 times more passes than the single cpu system... How it can be possible?
At first time, I though I had LAN issues, but doesn't matter wich computer is slaving or is the main. The result is the same. Also, if I put the same scene at the same time in each computer to render. Dual system is only 1.1~1.2 faster than the single one... So, what is going on?!

When dual system is rendering, 88 threats are full load (100%) all the time without any drop... So I guess corona is not handling properly dual CPUs computers. I guess, corona is rendering with both CPUs in "PARALLEL" instead of in "SERIAL" (adding passes). Cos something is missing or failing at corona programing code... And that makes sense why if I deactivate one cpu in the dual system, the performance rise a bit... Cos again, is just a guess, I think both cpus are fighting to render the same pass at same time, reading the same info at RAM at same time. But at the end, only 1 CPU passes are counting...

I made some test with vray also, and results are more or less expected (dual system renders 3 times more buckets than single cpu system)

So, anyone can send some light to this problem?

Ooops you were saying it is NOT C4D

What scores are your computers getting in the Corona Benchmark?


--- Quote from: maru on 2021-08-02, 14:45:51 ---What scores are your computers getting in the Corona Benchmark?

--- End quote ---

Hi, dual CPU system score are VERY far from the single CPU system:

2x E5-2696v4: 32 seconds

1x E5-5678v3: 1 minute and 51 seconds

That's why I am wondering something is wrong here....

I am doing a fresh format and reinstalling everything on again... Let's see tomorrow doing test how it is going on.

Meanwhile, I have done Vray benchmark too, and dual system is clearly more than 3 times faster and powerfull than the single one... I don't know why this doesn't translate to 3 times faster renderings in corona and 3dsmax (or at least 2 times faster, but almost the same performance is strange).


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