From e322fc4e0e08ac6af8d728cac20e82d6cd61893b Mon Sep 17 00:00:00 2001
From: JiabinYang <marsyang199376@gmail.com>
Date: Wed, 5 Sep 2018 13:59:23 +0000
Subject: [PATCH] add error info for nccl not found

---
 paddle/fluid/platform/dynload/dynamic_loader.cc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/paddle/fluid/platform/dynload/dynamic_loader.cc b/paddle/fluid/platform/dynload/dynamic_loader.cc
index 4fbfa6354ab..6a3ad215108 100644
--- a/paddle/fluid/platform/dynload/dynamic_loader.cc
+++ b/paddle/fluid/platform/dynload/dynamic_loader.cc
@@ -121,6 +121,12 @@ static inline void* GetDsoHandleFromSearchPath(const std::string& search_root,
     if (nullptr == dso_handle) {
       LOG(WARNING) << "Failed to find dynamic library: " << dlPath << " ("
                    << dlerror() << ")";
+      if (dlPath.find("nccl") != std::string::npos) {
+        std::cout
+            << "You may need to install 'nccl2' from NVIDIA official website: "
+            << "https://developer.nvidia.com/nccl/nccl-download"
+            << "before install PaddlePaddle" << std::endl;
+      }
       dlPath = dso_name;
       dso_handle = GetDsoHandleFromDefaultPath(dlPath, dynload_flags);
     }
-- 
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