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coll/libnbc: fix the red_schain algo of ireduce with MPI_IN_PLACE #2882

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Merged
merged 1 commit into from
Jan 30, 2017
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coll/libnbc: fix the red_schain algo of ireduce with MPI_IN_PLACE #2882

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15 changes: 10 additions & 5 deletions ompi/mca/coll/libnbc/nbc_ireduce.c
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,7 @@
* rights reserved.
* Copyright (c) 2013-2015 Los Alamos National Security, LLC. All rights
* reserved.
* Copyright (c) 2014-2016 Research Organization for Information Science
* Copyright (c) 2014-2017 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
*
* Author(s): Torsten Hoefler <htor@cs.indiana.edu>
Expand Down Expand Up @@ -425,19 +425,24 @@ static inline int red_sched_chain (int rank, int p, int root, const void *sendbu

/* last node does not recv */
if (vrank != p-1) {
if (vrank == 0) {
if (vrank == 0 && sendbuf != recvbuf) {
res = NBC_Sched_recv ((char *)recvbuf+offset, false, thiscount, datatype, rpeer, schedule, true);
} else {
res = NBC_Sched_recv ((char *) offset, true, thiscount, datatype, rpeer, schedule, true);
res = NBC_Sched_recv ((char *)offset, true, thiscount, datatype, rpeer, schedule, true);
}
if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
return res;
}

/* root reduces into receivebuf */
if(vrank == 0) {
res = NBC_Sched_op ((char *) sendbuf + offset, false, (char *) recvbuf + offset, false,
thiscount, datatype, op, schedule, true);
if (sendbuf != recvbuf) {
res = NBC_Sched_op ((char *) sendbuf + offset, false, (char *) recvbuf + offset, false,
thiscount, datatype, op, schedule, true);
} else {
res = NBC_Sched_op ((char *)offset, true, (char *) recvbuf + offset, false,
thiscount, datatype, op, schedule, true);
}
} else {
res = NBC_Sched_op ((char *) sendbuf + offset, false, (char *) offset, true, thiscount,
datatype, op, schedule, true);
Expand Down