Need advice on memory problem (how to use all computer's memory to simulate?)

nothingtolose · October 18, 2016, 12:21

Dear all,

I'm running Ansys fluent v15.0 on Dell R920 server( 96 cores, 128GB RAM, Windows server 2012 R2 64 bit OS). I run fluent in parallel mode with following parameters:
- Number of processes: 70
- Run Type: shared memory on local machine
- Dimension: 3D
- Other options: default values

But when the software running, i realized that only 12-16 GB of RAM is used, the remaining memory was still free (while 70 core processor was running 100% load), so, the simulation was very slow.

Anyone can give me some ideas to fix it?

Many thanks!!!

flotus1 · October 18, 2016, 14:34

I see nothing unusual here. The amount of allocated memory for a simulation depends on the amount of cells and some other simulation parameters. It must be less than the total amount of physical memory available, otherwise the simulation would run even slower.

October 18, 2016, 12:21	Need advice on memory problem (how to use all computer's memory to simulate?)	#1
nothingtolose New Member nothingtolose Join Date: Oct 2016 Posts: 1 Rep Power: 0	Dear all, I'm running Ansys fluent v15.0 on Dell R920 server( 96 cores, 128GB RAM, Windows server 2012 R2 64 bit OS). I run fluent in parallel mode with following parameters: - Number of processes: 70 - Run Type: shared memory on local machine - Dimension: 3D - Other options: default values But when the software running, i realized that only 12-16 GB of RAM is used, the remaining memory was still free (while 70 core processor was running 100% load), so, the simulation was very slow. Anyone can give me some ideas to fix it? Many thanks!!!

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October 18, 2016, 14:34		#2
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,400 Rep Power: 47	I see nothing unusual here. The amount of allocated memory for a simulation depends on the amount of cells and some other simulation parameters. It must be less than the total amount of physical memory available, otherwise the simulation would run even slower.