Slow simulation on E5 2683

Discussions about the use of Realflow
Evan.Qiu
Posts: 24
Joined: Wed Oct 26, 2016 2:09 pm

Slow simulation on E5 2683

Postby Evan.Qiu » Wed Feb 15, 2017 7:00 am

I've purchased a new PC
CPU: E5 2683 V3 X2, totally 28 cores / 56 threads, 2.0Ghz
Memory: 32G
Graphics card: GTX1070
But it seems the simulation is much slower than my old PC (I7 4790K + GTX970+ Memory: 32G)
Is it caused by the low frequency of E5 2683
Anyone has met same problem? thanks


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Oldcode
Posts: 745
Joined: Thu Nov 03, 2011 11:28 pm

Re: Slow simulation on E5 2683

Postby Oldcode » Wed Feb 15, 2017 3:45 pm

Hi,

The act of splitting up the job and assigning them to each tread actually takes up quite a bit of CPU power. Real Flow is kind of strange where more cores can actually do more harm than good and a higher processing speed is better than more cores. All those threads will come in handy at render time thought. :D

Go into your settings and try using just 2 or 4 cores to start out with and see what difference it makes. I have a 4.2Ghz AMD with 8 cores and it runs well.

Good Luck,
"My sword and my service are yours."

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Evan.Qiu
Posts: 24
Joined: Wed Oct 26, 2016 2:09 pm

Re: Slow simulation on E5 2683

Postby Evan.Qiu » Wed Feb 15, 2017 4:31 pm

Hi,
Just now, I increased the resolution of an emitter to be 15000, very crazy value, and then the E5 2683 V3 X2 runs a little bit faster than I7 4790K, but when the resolution is a normal value like 5 or 10, it runs much slower than I7 4790K
And many thanks for your suggestion, I'll have a try to just use less cores

Nathan
Posts: 5
Joined: Mon Feb 20, 2017 11:35 pm

Re: Slow simulation on E5 2683

Postby Nathan » Tue Feb 21, 2017 11:51 am

Evan.Qiu wrote:Hi,
Just now, I increased the resolution of an emitter to be 15000, very crazy value, and then the E5 2683 V3 X2 runs a little bit faster than I7 4790K, but when the resolution is a normal value like 5 or 10, it runs much slower than I7 4790K
And many thanks for your suggestion, I'll have a try to just use less cores


I was testing emitter with low values and CPU load were low aswell
increase sample amount in most cases will use more and more CPU resources
its maybe some artificial restrictions inside realflow core

alex
Posts: 37
Joined: Tue May 25, 2010 1:18 pm

Re: Slow simulation on E5 2683

Postby alex » Wed Feb 22, 2017 1:59 pm

Hi guys,

Evan.Qiu, when you say "increasing an emitter resolution", do you mean for Hybrido, Dyverso, or legacy standard particles?

If it is the latest, standard particles have never been that good at performance scalability. Hybrido and Dyverso should do much better.
RealFlow Team
Next Limit Technologies

Evan.Qiu
Posts: 24
Joined: Wed Oct 26, 2016 2:09 pm

Re: Slow simulation on E5 2683

Postby Evan.Qiu » Fri Feb 24, 2017 3:25 am

alex wrote:Hi guys,

Evan.Qiu, when you say "increasing an emitter resolution", do you mean for Hybrido, Dyverso, or legacy standard particles?

If it is the latest, standard particles have never been that good at performance scalability. Hybrido and Dyverso should do much better.


Hi Alex:
I mean Dyverso, I think E5 2683 is not good for RF because of its low CPU clock speed,

ivalduan
Posts: 13
Joined: Fri Feb 10, 2017 10:11 am

Re: Slow simulation on E5 2683

Postby ivalduan » Fri Feb 24, 2017 9:28 am

RealFlow is not optimized for architectures with several sockets (NUMA) yet, probably is better to run several instances of realflow with less threads to maximize resource usage.

Evan.Qiu
Posts: 24
Joined: Wed Oct 26, 2016 2:09 pm

Re: Slow simulation on E5 2683

Postby Evan.Qiu » Fri Feb 24, 2017 2:17 pm

ivalduan wrote:RealFlow is not optimized for architectures with several sockets (NUMA) yet, probably is better to run several instances of realflow with less threads to maximize resource usage.


Yes, I think so, so I really don't know which CPU is the best one for Realflow currently, I guess the clock speed of the CPU is very important for Realflow, I have another PC with I7 4790K, 4.0-4.4GHz, which CPU will be better?


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