NCSHMEM: Difference between revisions

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By default no shared memory MPI is in the non-cubic scaling GW routines.
By default no shared memory MPI is in the non-cubic scaling GW routines ({{TAG|ALGO}}=EVGW, EVGW0, QPGW and QPGW0).
For shared memory in the non-cubic scaling GW set NCSHMEM=-1.
For shared memory in the non-cubic scaling GW set NCSHMEM=-1.


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== Related tags and articles ==
== Related tags and articles ==
[[Shared memory]], {{TAG|IALGO}}, [[Practical guide to GW calculations]]
[[Shared memory]], {{TAG|ALGO}}, [[Practical guide to GW calculations]]


[[Category:Performance]][[Category:VASP6]][[Category:Machine-learned force fields]][[Category:Memory]]
[[Category:Performance]][[Category:VASP6]][[Category:Machine-learned force fields]][[Category:Memory]]

Revision as of 09:35, 21 July 2022

NCSHMEM = [integer]
Default: NCSHMEM = 1 

Description: NCSHMEM determines the number of compute cores sharing the memory in MPI in the non-cubic scaling GW routines.


By default no shared memory MPI is in the non-cubic scaling GW routines (ALGO=EVGW, EVGW0, QPGW and QPGW0). For shared memory in the non-cubic scaling GW set NCSHMEM=-1.


Warning: For the openmp version NCHSMEM is not active and shared memory is not used for MPI. In that case the memory is shared between threads.

Related tags and articles

Shared memory, ALGO, Practical guide to GW calculations