[Nek5000-users] Compiling large problem sizes

[nek5000-users at lists.mcs.anl.gov]

What do you do to increase the amount of available memory?

In your current setting, Nek5000 compiles with one processor since lpmin is set to 1. You have to increase it to successfully compile.

Marco

On Dec 4, 2017, at 2:53 PM, nek5000-users at lists.mcs.anl.gov<mailto:nek5000-users at lists.mcs.anl.gov> wrote:

Hi all,

I'm trying to compile a 3D mesh with mesh size of 6000 ekements. Unfortunately I keep running into compilation errors. To be clear I can compile problems upto 3000 elements large. But setting lelt value larger than 3000 results in an error.

I have realised this might be a memory issue and have tried to compile with increasing amounts of available memory. This does not seem to resolve the issue.

To be clear my SIZE looks like this

 parameter (ldim=3)               ! domain dimension (2 or 3)
      parameter (lx1=6)                ! p-order (avoid uneven and values <6)
      parameter (lxd=10)               ! p-order for over-integration (dealiasing)
      parameter (lx2=lx1-2)            ! p-order for pressure (lx1 or lx1-2)

      parameter (lelg=6000)             ! max total number of elements
      parameter (lpmin=1)              ! min MPI ranks
      parameter (lpmax=1024)           ! max MPI ranks
      parameter (ldimt=1)              ! max auxiliary fields (temperature + scalars)

Sincerely,

--

Amitvikram Dutta

Graduate Research Assistant

Fluid Mechanics Research Lab

University of Waterloo

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