[Nek5000-users] Getting Error when compiling a large problem

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

Dear Paul,


Thanks a lot for your prompt response.

I am trying to generate the grid with 642*642*42 elements. And most probably I have to go to lx1 = 10 or 12. So the problem size will be something like 6400*6400*420. I will have to use 32768 or 65536 cores on SuperMUC.

I generated this grid with earlier version of Nek (svn), and had to change MAXNEL in genbox and genmap directories.

In the new version, it appears that changing MAXNEL in maketools enforces this value everywhere.


I am getting error in the postnek. Prenek appears to have compiled.


The error is as follows:


/usr/app-soft/intel/v2017/bin/ifort -o  /usr/wrk/people6/ampa9999/Nek_v17/Nek5000/bin/postx postnek.o postnek2.o postnek3.o postnek5.o postnek6.o tsort.o postnek8.o postnek9.o plot.o getfld.o legend.o userf.o revert.o trap.o animate.o genxyz.o screen.o g3d.o subs.o xinterface.o locglob.o postnek5a.o blas.o xdriver.o scrdmp.o coef.o postnek7.o speclib.o mxm.o byte.o ssyev.o iolib.o -L/usr/lib/X11 -lX11 -lm
make[1]: Leaving directory `/usr/wrk/people6/ampa9999/Nek_v17/Nek5000/tools/postnek'

ERROR: postnek failed to compile!





Dear Ambrish,


What polynomial order are you using?

How many processors?


This seems like a very large number of elements (a record number).


What resolution, in terms of grid points, are you targeting.


Best,


Paul





Dear Nek Users,


I need to generate a rectangular grid with 17,310,888 elements. However, when I am changing MAXNEL in the maketools and recompiling, I am getting error. I am attaching the compilation output and my maketools file here. Could you please help me regarding that? Compilation works fine for MAXNEL=4,000,000.

Thanks in advance for your help.


With best regards,
Ambrish


What tools failed? I guess prenek and postnek??

On 13 Jul 2018, at 17:19, "nek5000-users at lists.mcs.anl.gov <mailto:nek5000-users at lists.mcs.anl.gov> " <nek5000-users at lists.mcs.anl.gov <mailto:nek5000-users at lists.mcs.anl.gov> > wrote:




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