More feedback on job running on the cloud: RAM

[DavidTruyens]

Dear Sim Team,

I really like working with the cloud. It enables me as well to run bigger models. As far as I know you now have 64Gb or Ram on the servers on the cloud. So when I have a big analysis I could run over that limit and my calculation will take forever but I might not even realise it's due to the Ram consuption.

So it would be great if there would be an extra field in the job details that say's how much ram I'm using for my sim.

Thanks!

David

[hartogj]

Hi, Thanks for the feedback and idea.Just curious how large your models typically are?

The element count (reported in the status file) is usually a fair indicator of how much memory will be required. It is usually good to budget for 2GB RAM per million elements although often times much less is needed.

Additional, the approx amount of memory used by the solver can be measured in the summary file. This can be used as a barometer for how much memory one simulation would require relative to another. I copied an example below - this appears at the bottom of the summary file.

Jon

Input: 305 seconds
Analysis: 701 seconds
Output: 210 seconds
Total: 1216 seconds

Master process dynamic memory 3161 Mbytes
Slave process 0 dynamic memory 748 Mbytes
Slave process 1 dynamic memory 597 Mbytes
Slave process 2 dynamic memory 588 Mbytes
Slave process 3 dynamic memory 599 Mbytes
Slave process 4 dynamic memory 584 Mbytes
Slave process 5 dynamic memory 708 Mbytes
Slave process 6 dynamic memory 705 Mbytes
Slave process 7 dynamic memory 726 Mbytes

[DavidTruyens]

Hi Jon,

Thanks for the reaction. As I work for distribution I face a lot of different applications (pumps, heatexchangers, building and electronics) so it depends a lot on what type of customer. 

I know there's a lot of information in the solver log files, but Ram usage to me is one of the first things I check in the task manager to know how fast it'll solve (on my machine it starts slowing down a lot if it's bigger than 12Gb (just something from expierience, not a hard fact....). It seems that it doesn't scale liniear once you reached a certain threshold. My machine has 32Gb of ram.

If we have a lot more memory available I'm also thinking of other applications (more free surface and motion). 

[Dan_Margulius]

Hello,

i understand that we are given 8 cores in the cloud with 2.67 Ghz. AD should give more cores or faster ones because today 

a simple computer with 8 cores and 3.6 Ghz is runnung much much faster than the cloud itself.

Thanks

Dan

[hartogj]

Happy to report that the sim cloud infrastructure is being updated with the 2016 product launches. If you run the new 2016 version of CFD in the cloud, the job will be completed on a new system that is quicker than before. The speed impacts will vary by model size and type, but below is a comparison to give you an idea of how the old and new compare:

In addition to the solve time improvements, file compression has also been updated to help with downloads. The 2016 releases are starting to be posted for customers now so you can start taking advantage of this. Check the Autodesk Account page (accounts.autodesk.com) for the new version - customers with active contracts should see it there within the next few weeks if not already.

@dts and DanM  - thanks for the feedback!

Jon

[Dan_Margulius]

Great stuff,

Thank you very much 🙂 

Now all that is left is to solve the humidity problem and that's it

Thanks

Dan

[DavidTruyens]

Great job!! 🙂