NCSHMEM: Difference between revisions
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[[Shared memory]], {{TAG|ALGO}}, [[Practical guide to GW calculations]] | [[Shared memory]], {{TAG|ALGO}}, [[Practical guide to GW calculations]] | ||
[[Category:Performance]][[Category: | [[Category:Performance]][[Category:Many-body perturbation theory]][[Category:GW]][[Category:Memory]] | ||
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. |