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How to increase allocated RAM in ANSYS mechnical APDL

How to increase allocated RAM in ANSYS mechnical APDL

How to increase allocated RAM in ANSYS mechnical APDL

I have accessibility to high speed computer ( CPU=24cores and RAM=32GB). I adjusted ansys mechnical apdl product launcher as follows:
high performance computing setup-Type performance computing-used shared memory parallel(SMP)-number of processor=20
when I run the simulation and check task manager I realized cpu uses cores up to 92% (it is ok) but used Ram was 3.5GB and it was less than 11%
is there any trick or method to increase allocated RAM?
it should be noted I manipulated custom memory setting as follows:
customization preferences-used custom memory setting-28000MB for total workspace, 14000MB for data base but no difference appeared in used RAM by ansys. and also elapsed time for solution in laptop (core i7, RAM=12GB) has not difference with high computer speed ( CPU=24cores and RAM=32GB) as if the effect of increase number of processors and RAM on solution time is nothing!!!!!
any comment would be appreciated.

RE: How to increase allocated RAM in ANSYS mechnical APDL

How big is your analysis?
I have only used ANSYS mechanical without the APDL. If the solver selection type is set to Auto, it attempts to use a direct solver where the entire analysis is loaded into RAM. If the analysis is to large, it will use the iterative solver which involves switching and moving sub parts of the analysis between RAM and virtual slow SSD drive RAM.
Due to the slow speed of a SSD drive, the iterative option takes about five times longer and often there is not enough RAM to even complete this.
It is possible that ANSYS has decided that it can't fit the entire analysis into your RAM, and is reverting to an iterative analysis. Perhaps you just don't have enough RAM.
I tend to just select Direct or Iterative and let ANSYS manage the RAM.
This is probably not much help to you. I'm waiting for a 64Gb upgradable to 128Gb machine to arrive where I won't need to mess around with this RAM issue so much.

RE: How to increase allocated RAM in ANSYS mechnical APDL

Hey DriveMeNuts
in .stat file I have : Sparse Solver : curEqn= 37855 totEqn= 37855

RE: How to increase allocated RAM in ANSYS mechnical APDL

You can consider using BCSOPTION command. It may help.


For more details, check this link. The 'PERFORMANCE' option in command outputs amount of memory required to run in incore mode based o which you can do model changes after first run.

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