From edb49ed2d55d16a89b2332d8d0ec83958acbb4f7 Mon Sep 17 00:00:00 2001
From: Wenkai Du <wenkai.du@amd.com>
Date: Sat, 25 Apr 2020 01:01:13 +0000
Subject: [PATCH] Fix incorrect next device ID in PCI ordered search

---
 src/graph/search.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/graph/search.cc b/src/graph/search.cc
index a0de32fdd4..ba4ac472ab 100644
--- a/src/graph/search.cc
+++ b/src/graph/search.cc
@@ -345,7 +345,7 @@ ncclResult_t ncclTopoSearchRecGpu(struct ncclTopoSystem* system, struct ncclTopo
     int next[NCCL_TOPO_MAX_NODES];
     int count;
     if (forcedOrder == FORCED_ORDER_PCI) { // Try the PCI order
-      next[0] = (busIdToCudaDev(gpu->id)+1)%system->nodes[GPU].count;
+      next[0] = step+1;
       count = 1;
     } else if (forcedOrder == FORCED_ORDER_REPLAY) { // Try last channel order
       NCCLCHECK(ncclTopoReplayGetGpu(system, graph, step, next));