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COLL/BASE: Fix linear sync all2all - v4.0.x #6750

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merged 1 commit into from
Jun 17, 2019
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COLL/BASE: Fix linear sync all2all - v4.0.x #6750

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8 changes: 4 additions & 4 deletions ompi/mca/coll/base/coll_base_alltoall.c
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Original file line number Diff line number Diff line change
Expand Up @@ -398,22 +398,22 @@ int ompi_coll_base_alltoall_intra_linear_sync(const void *sbuf, int scount,
prcv = (char *) rbuf;
psnd = (char *) sbuf;

/* Post first batch or ireceive and isend requests */
/* Post first batch of irecv and isend requests */
for (nreqs = 0, nrreqs = 0, ri = (rank + 1) % size; nreqs < total_reqs;
ri = (ri + 1) % size, ++nrreqs) {
nreqs++;
error = MCA_PML_CALL(irecv
(prcv + (ptrdiff_t)ri * rext, rcount, rdtype, ri,
MCA_COLL_BASE_TAG_ALLTOALL, comm, &reqs[nreqs]));
nreqs++;
if (MPI_SUCCESS != error) { line = __LINE__; goto error_hndl; }
}
for (nsreqs = 0, si = (rank + size - 1) % size; nreqs < 2 * total_reqs;
si = (si + size - 1) % size, ++nsreqs) {
nreqs++;
si = (si + size - 1) % size, ++nsreqs) {
error = MCA_PML_CALL(isend
(psnd + (ptrdiff_t)si * sext, scount, sdtype, si,
MCA_COLL_BASE_TAG_ALLTOALL,
MCA_PML_BASE_SEND_STANDARD, comm, &reqs[nreqs]));
nreqs++;
if (MPI_SUCCESS != error) { line = __LINE__; goto error_hndl; }
}

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