Low CPU and high RAM usage

[Ralfons]

Dear fellow FDS-users,

I'm simulating underground train stations at the moment and recently faced some strange behavior with CPU utilization.
The simulation was running fine with both CPU and RAM at 80 to 90%, but after adding 2 small obstacles and 1 hole, perfectly aligning with the mesh, no cavities and no significant impact on the flow field at all. However, RAM was occupied by appr. 90%, but the CPU only between 10% and 20%. Thus, the simualtion was very slow. I'm trying to figure out reasons, but so far this seems very arbitrary.
I'm using 8 to 15 cores, all evenly occupied for all cases (it's not that I have 10 cores and only one of them is on 10%).

Any ideas what could cause this behavior in this special case? Is there any general conclusions one can make if the CPU is on such a low usage?
And secondly, is there some literature recommendations on how to optimize an FDS-simulation with respect to a certain computer configuration?

Best Regards,
Ralf Lehmann

[Salah Benkorichi]

I don't know how you are running your case. Are you using serial or parallel work? 

How many meshes do you have?

How many cells per mesh do you have? 

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