[Nek5000-users] MPI_TAG_UB too small

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

Dear Neks,


I'm having a problem running my simulation with thousands of processors. In my case, I have 6090000 elements and I ran the simulation with 8520 procs. However, the simulation aborted with the error message 'MPI_TAG_UB too small'.


I checked the code and found that if "nval.lt.(10000+max(lp,lelg))", the simulation would abort. But in the subroutine 'mpi_attr_get', ival is set to be 9999999. In this case, nval should be larger than 10000+max(lp,lelg). So, why did the simulation not run?


 Hope anyone can help me on this. Thank you very much.


Best regards,

Tony
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