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ExaHyPE
ExaHyPEDocumentation
Commits
cae8f6d8
Commit
cae8f6d8
authored
May 15, 2019
by
Dominic Etienne Charrier
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parent
6804843e
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21_distributedmemory.tex
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cae8f6d8
...
...
@@ 392,12 +392,12 @@ metric if you switch this feature on (\texttt{hotspot}, e.g.).
\subsection
{
Meshes for weak and strong scaling
}
\exahype
distributes work by decomposing the tripartitioned spacetree into
\exahype
\
distributes work by decomposing the tripartitioned spacetree into
subtrees that are deployed to worker processes.
Only subtrees that overlap with the computational domain are deployed.
This constraint can be used to steer work distribution.
\exahype
can scale the bounding box such that
\texttt
{
outside
\_
cells
\_
left
}
and/or
\\
\exahype
\
can scale the bounding box such that
\texttt
{
outside
\_
cells
\_
left
}
and/or
\\
\texttt
{
outside
\_
cells
\_
right
}
cells are placed outside of the
domain while the latter is still resolved as accurately as specified in the spec file.
...
...
@@ 427,10 +427,9 @@ on the left side and 12 ranks per dimension. The mesh
is interesting since it can be perfectly distributed among
$
2
^
d
$
,
$
4
^
d
$
, and
$
12
^
d
$
processes.
The same mesh refined by a factor
$
3
^
i
$
,
$
i
\leq
0
$
can be constructed if
$
3
^
i
\times
9
$
bounding box outside cells
are placed to the left of the domain. The
$
36
^
d
$
mesh requires a maximummeshsize of
$
\frac
{
1
}{
36
}
\approx
0
.
03
$
.
The uniformly refined variants must scale this mesh size with a factor
$
3
^{

i
}$
.
The same mesh refined by a factor
$
3
^
i
$
,
$
i
\leq
0
$
, is constructed by placing
$
3
^
i
\times
9
$
bounding box
cells left to the domain. The
$
36
^
d
$
mesh requires a maximummeshsize of
$
\frac
{
1
}{
36
}
\approx
0
.
03
$
.
For further uniform refinement, this mesh size must be scaled by a factor
$
3
^{

i
}$
.
Another family of interesting uniform meshes are the ones with
$
3
^
i
\times
48
^
d
$
cells that are shifted
by
$
3
^
i
\times
3
$
cells. They can be created by choosing
$
\texttt
{
ranks
\_
per
\_
dimension
}
=
16
$
...
...
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