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jpekkila
2020-05-28 17:10:17 +03:00
parent 01ad141d90
commit 4748e48c7d
1 changed files with 6 additions and 6 deletions
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12
src/core/device.cc
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@@ -466,21 +466,21 @@ Quick overview of the MPI implementation:
The halo is partitioned into segments. The first coordinate of a segment is b0. The halo is partitioned into segments. The first coordinate of a segment is b0.
The array containing multiple b0s is called... "b0s". The array containing multiple b0s is called... "b0s".
Each b0 maps to an index in computational domain of some neighboring process a0. Each b0 maps to an index in the computational domain of some neighboring process a0.
We have a0 = mod(b0 - nghost, nn) + nghost. We have a0 = mod(b0 - nghost, nn) + nghost.
Intuitively, we Intuitively, we
1) Transform b0 into coordinate system where (0, 0, 0) is the first index in 1) Transform b0 into a coordinate system where (0, 0, 0) is the first index in
the comp domain. the comp domain.
2) Wrap the transformed b0 around nn (comp domain) 2) Wrap the transformed b0 around nn (comp domain)
3) Transform b0 back to a coordinate system where (0, 0, 0) is the first index 3) Transform b0 back to a coordinate system where (0, 0, 0) is the first index
in the ghost zone in the ghost zone
struct PackedData is used for packing and unpacking and holds the actual data in struct PackedData is used for packing and unpacking. Holds the actual data in
the halo partition the halo partition
struct CommData holds multiple PackedDatas for sending and receiving halo struct CommData holds multiple PackedDatas for sending and receiving halo
partition partitions
struct Grid contains information about the GPU device, decomposition, the total struct Grid contains information about the local GPU device, decomposition, the
mesh dimensions and CommDatas total mesh dimensions and CommDatas
Basic steps: Basic steps: