NCSHMEM: Difference between revisions
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{{TAGDEF|NCSHMEM|[integer]|1 }} | {{TAGDEF|NCSHMEM|[integer]|1 }} | ||
Description: {{TAG|NCSHMEM}} determines the number of compute cores sharing the memory | Description: {{TAG|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 ({{TAG|ALGO}}=EVGW, EVGW0, QPGW and QPGW0). | |||
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.}} | |||
== Related tags and articles == | == Related tags and articles == | ||
[[Shared memory]] | [[Shared memory]], {{TAG|ALGO}}, [[Practical guide to GW calculations]] | ||
[[Category:Performance]][[Category: | [[Category:Performance]][[Category:Many-body perturbation theory]][[Category:GW]][[Category:Memory]] | ||
Latest revision as of 09:38, 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. |