Learning Forum

[Gary Wang]

Hi, I encountered an error reminding not enough merory. The machine I used das 128Gb of RAM. And I have checked that during the initial solving, the RAM is under 15% usage. There should be enough RAM. And my model is not that complex with only 19647 elements. I used 4 cores to solve, do I need to allocate RAM for the Ansys? My previous simulation didn't require this. 

In the Solution Information, it shows that only 2610MB was used for the solver, and the in-core or out-of-core solution didn't take all of them. So why there is an error?

Thanks in advance. 

[Gary Wang]

Adding some materials I find related to this issue:

https://forum.ansys.com/forums/topic/there-is-not-enough-memory-for-the-distributed-sparse-matrix-solver-to-proceed-using-the-out-of-core/

https://forum.ansys.com/forums/topic/error-37/

https://www.eng-tips.com/viewthread.cfm?qid=446658

https://www.eureka.im/3048.html

https://forum.ansys.com/forums/topic/how-to-solve-not-enough-memory-error/

https://forum.ansys.com/forums/topic/not-enough-memory-error/

[Gary Wang]

Any help from the community? Thanks a lot.

[Mike Rife]

Hi Gary Wang

There are no errors being shown in the screen shot, just warnings.  Check the output prior to the screen shot; there may be a reason given why the solver changed to the out-of-core mode.  Guessing due to partial pivoting.  

[Gary Wang]

Hi Mike,

I didn't capture the full error. want to show the exact RAM usage. Could you help me understand why my 128G RAM is not fully used? And how to take full advantage of my hardware for speedup the simulation?

Best,

Gary

[Mike Rife]

Gary

If partial pivoting is activated the charateristics of the stiffness matrix is not known prior to formulation, so the memory allocation needed cannot be known.  So out-of-core needs to be used.