NCSHMEM: Difference between revisions
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By default no shared memory MPI is in the non-cubic scaling GW routines ({{TAG|ALGO}}=EVGW, EVGW0, QPGW and QPGW0). | 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 using shared memory MPI in the non-cubic scaling GW set NCSHMEM=-1. | ||
{{NB|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.}} | {{NB|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 == | == Related tags and articles == | ||
[[Shared memory]], {{TAG|ALGO}}, [[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 09:36, 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 using shared memory MPI 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. |