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Change location of COMSOL's virtual memory (out-of-core file)
Posted Apr 17, 2018, 6:11 a.m. EDT Mesh, Studies & Solvers, System Requirements Version 5.3 1 Reply
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Dear community,
I am currently trying to compare different mesh qualities and how the mesh affects the solution of the problem. So the point I am stuck right now is the finest mesh: The study with the fine mesh needs MUMPS to switch to "out of core" mode and allocate a lot of virtual memory. I have a 250GB SSD in my PC - the root directory (where Comsol is installed and the virtual memory is used) has now 20GB free space, which is not enough for the calculation. At the point, where all of the free space is filled with the out-of-core file the calculation failes with following error:
Failed to find a solution. Unable to read or write out-of-core file. Returned solution is not converged.
I tried to enlarge my systems swap with this approach (I am running comsol on Ubuntu 16.04 and I have free space at other disks / partitions): https://www.techwalla.com/articles/how-to-increase-virtual-memory-in-linux
But I noticed, that comsol is not using the swap, but its own "out-of-core" memory file (if I understood that right).
Is there a possibility to tell comsol where to save that "swap-out-of-core-file" without repartitioning my disk or buying more RAM? ;-) It would also be possible to put this file into the systems swap which is 60GB right now and can be enlarged (I know that swap is slow, but better slow than not possible...)
If you need any information please let me know!
Thank you all for your time! Klaus
Hello Jimi
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Would appreciate if you can share the solution in the forum if you have solved the problem.
Even I get the same error and am using MUMPS/ out of core option. Failed to find a solution for the initial parameter. Unable to read or write out-of-core file. Returned solution is not converged. - Feature: Stationary Solver 1 (sol1/s1)
Best Regards, Gayathri