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Multi-Threading Could someone please explain this... - Printable Version

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Multi-Threading Could someone please explain this... - jrand - 03-12-2007

Superhypersam brought this up,( I am beginning to think I missed something) and of course being a curious little monkey that I am, did a quick test...

single grid, object source emitter, 20 frames:

All Available checked (4 cores): 01:40

4 threads: 01:41
3 threads: 01:22
2 threads: 01:12
1 thread: 00:44

interesting... Why are my sim times so much faster when only using one core? How is the processing done? Kind of strange that the sim calculates in almost a minute faster using only one thread.

Could someone please enlighten me?

Obviously I haven't tried it one a more complex scene yet to see if there is any difference (would take a few nights me thinks) but anyway any explanations would be greatly appreciated.

-John

- ddiener - 03-12-2007

Interesting !

I can not explain it directly, but a´ve had a similar expirience with Backburner-Rendering (2 Dualcore-Machines).

I was wondering, because i tendered 3 minute on one machine (no BB in use). The two machines needed 51min50sec.

But it may be the thing: on short sequences the preparing of data is as time consuming, that the total processing is slower than single-threaded.
(The data has to be splitted up for each thread, then it has to be sent to each core, and each core wants to be managed all the time by the application).

Would be interesting to hear, what happens on longer sequences.

Best wishes
Dominik

- sitnisati - 03-13-2007

Hello,

We are aware of this problem and we're looking into the cause.
As soon as we fix it, update will be available from our members area.

Best regards,

Kresimir

- jrand - 03-13-2007

Hi Dominik,

What you are saying makes sense but three more seconds per frame? Seems high to me considering the speed of the processor/ram. Maybe more if it were caching to disk but it isn't.


Thanks Kresimir, I figured maybe I had missed something, somewhere, somehow.

- ddiener - 03-13-2007

Ups, sorry, i wrote an error Smile i meant:
Single machine: 3 minutes (no BB in use)
2 machines via BB needed 5min50sec (and not 51 minutes).

But again, i think with BB thishappened because of preparing data, sending,starting Max... for serious results this scene was too small.

What Kesimir said, VERY nice to hear Wink i´m exited to see, what performance-boosts we will get...

- sitnisati - 03-15-2007

Hello,

I want to update you on this issue.
We have found what is causing slow down.
Fix will be included in FumeFX 1.0a and you can expect FumeFX to be around 30% faster on dual core (or 2 CPU) machines.

Regards,

Kresimir

- jrand - 03-15-2007

Wonderful!

Thank you Big Grin

-John

- milwatt - 03-15-2007

Great !!!!

- ddiener - 04-26-2007

sitnisati Wrote:Hello,

I want to update you on this issue.
We have found what is causing slow down.
Fix will be included in FumeFX 1.0a and you can expect FumeFX to be around 30% faster on dual core (or 2 CPU) machines.

Regards,

Kresimir

Hi Kesimir,

since you gave some information about the Afterburn4-release-date, i want to ask: Can you give similar information about a FFX-update - especially this performance-issue and/or about moving FFX-Grids ?

Thank you
Dominik

- sitnisati - 04-26-2007

Hello Dominik,

FumeFX 1.0a is released today.
We're waiting TurboSquid for details how existing users will obtain their two free Simulation licenses. We'll keep you informed.

Regards,

Kresimir

- ddiener - 04-26-2007

Thank you !

- jrand - 04-26-2007

Super! Thanks Kresimir Big Grin

Two sim licenses too... sweeeet!

- cnaeger - 04-26-2007

What was the info on a Afterburn 4 release date? Big Grin

Chad

- sitnisati - 04-28-2007

cnaeger Wrote:What was the info on a Afterburn 4 release date? Big Grin

Chad

We're looking for September, but we'll know more when when enter beta testing.

Regards,

Kresimir

- jrand - 04-30-2007

Retested and whatever you guys did... WOW! that's more like it Big Grin

single grid, object source emitter, 20 frames:

All Available checked (4 cores): 00:11

4 threads: 00:11
3 threads: 00:14
2 threads: 00:16
1 thread: 00:27

That makes a lot more sense. Thanks again for your guys hard work :wink:

BTW excited to see afterburn run under the fusion renderer.

- smokey - 05-13-2007

jrand Wrote:BTW excited to see afterburn run under the fusion renderer.

Is this planned for the next afterburn release ?

- jrand - 05-21-2007

as far as I know/have heard, it has been mentioned.