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mpi: add rank offset/format

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This commit is contained in:
Christian Zimmermann 2024-10-14 22:56:58 -07:00
parent de7ac23f87
commit ce5c3a25b1
2 changed files with 38 additions and 5 deletions
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35
src/opt/mpi/include/rrange.cc.h
View file

@ -30,7 +30,9 @@ namespace CNORXZ
mRange(in.mRange),
mI(std::make_shared<IndexI>(mRange->local())),
mK(std::make_shared<IndexK>(mRange->geom())),
mNRanks(getNumRanks())
mNRanks(getNumRanks()),
mRankOffset(in.mRankOffset),
mRankFormat(in.mRankFormat)
{
*this = in.lex();
}
@ -42,6 +44,8 @@ namespace CNORXZ
mI = std::make_shared<IndexI>(mRange->local());
mK = std::make_shared<IndexK>(mRange->geom());
mNRanks = getNumRanks();
mRankOffset = in.mRankOffset;
mRankFormat = in.mRankFormat;
*this = in.lex();
return *this;
}
@ -271,19 +275,25 @@ namespace CNORXZ
Vector<size_t> lexs(mNRanks);
MPI_Allgather(&lex, 1, MPI_UNSIGNED_LONG, lexs.data(), 1, MPI_UNSIGNED_LONG,
MPI_COMM_WORLD);
SizeT root = 0;
for(; root != lexs.size(); ++root) {
SizeT root = mRankOffset;
//SizeT root = 0;
for(; root < lexs.size(); root += mRankFormat) {
//for(; root < lexs.size(); ++root) {
if(lexs[root] != mI->lmax().val()){
break;
}
}
if(root == lexs.size()){ // metaPos not in rrange
if(root >= lexs.size()){ // metaPos not in rrange
*this = lmax().val();
VCHECK(toString(metaPos));
assert(0);
}
else {
*mK = root;
assert((root-mRankOffset) % mRankFormat == 0);
const SizeT kx = (root-mRankOffset) / mRankFormat;
CXZ_ASSERT(kx < mK->lmax().val(), "invalid rank; check rankFormat!");
*mK = kx;
//*mK = root;
*mI = lexs[root];
(*this)();
}
@ -404,12 +414,27 @@ namespace CNORXZ
return mK;
}
template <class IndexI, class IndexK>
void RIndex<IndexI,IndexK>::setRankFormat(SizeT rankFormat)
{
mRankFormat = rankFormat;
CXZ_ASSERT(mNRanks % mRankFormat == 0, "rankFormat (" << mRankFormat
<< ") does not divide total number of ranks (" << mNRanks << ")");
}
template <class IndexI, class IndexK>
SizeT RIndex<IndexI,IndexK>::rankFormat() const
{
return mRankFormat;
}
template <class IndexI, class IndexK, class I1>
decltype(auto) operator*(const Sptr<RIndex<IndexI,IndexK>>& a, const Sptr<I1>& b)
{
return iptrMul(a, b);
}
/*=====================+
| RRangeFactory |
+=====================*/

8
src/opt/mpi/include/rrange.h
View file

@ -159,12 +159,20 @@ namespace CNORXZ
/** Get index indicating the current rank this index points to. */
Sptr<IndexK> rankI() const;
/** Set the rank format. */
void setRankFormat(SizeT rankFormat);
/** Get the rank format. */
SizeT rankFormat() const;
private:
SizeT mLex = 0;
Sptr<RangeType> mRange; /**< RRange. */
Sptr<IndexI> mI; /**< Index on the local range of the THIS rank. */
Sptr<IndexK> mK; /**< Multi-index indicating the current rank. */
SizeT mNRanks; /**< Number of ranks; in general different from but dividable by mK's maximum. */
SizeT mRankOffset = 0; /** < Offset in case this index only serves a sub-slice of ranks .*/
SizeT mRankFormat = 1; /**< Frequency of ranks to be served by this index. */
};
template <class IndexI, class IndexK>