Add HasCUDNN to detect if CUDNN is installed or not (#6349)

* Add HasCUDNN to detect if CUDNN is installed or not

* Fix CI

paddle/platform/dynload/cudnn.cc

@@ -12,7 +12,8 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License. */
 
-#include <paddle/platform/dynload/cudnn.h>
+#include "paddle/platform/dynload/cudnn.h"
+#include "paddle/platform/enforce.h"
 
 namespace paddle {
 namespace platform {
@@ -41,6 +42,21 @@ CUDNN_DNN_ROUTINE_EACH_R5(DEFINE_WRAP);
 CUDNN_DNN_ROUTINE_EACH_R7(DEFINE_WRAP);
 #endif
 
+#ifdef PADDLE_USE_DSO
+bool HasCUDNN() {
+  std::call_once(cudnn_dso_flag, GetCudnnDsoHandle, &cudnn_dso_handle);
+  return cudnn_dso_handle != nullptr;
+}
+
+void EnforceCUDNNLoaded(const char* fn_name) {
+  PADDLE_ENFORCE(cudnn_dso_handle != nullptr,
+                 "Cannot load cudnn shared library. Cannot invoke method %s",
+                 fn_name);
+}
+#else
+bool HasCUDNN() { return true; }
+#endif
+
 }  // namespace dynload
 }  // namespace platform
 }  // namespace paddle

paddle/platform/dynload/cudnn.h

@@ -25,9 +25,11 @@ namespace dynload {
 
 extern std::once_flag cudnn_dso_flag;
 extern void* cudnn_dso_handle;
+extern bool HasCUDNN();
 
 #ifdef PADDLE_USE_DSO
 
+extern void EnforceCUDNNLoaded(const char* fn_name);
 #define DECLARE_DYNAMIC_LOAD_CUDNN_WRAP(__name)                    \
   struct DynLoad__##__name {                                       \
     template <typename... Args>                                    \
@@ -36,6 +38,7 @@ extern void* cudnn_dso_handle;
       std::call_once(cudnn_dso_flag,                               \
                      paddle::platform::dynload::GetCudnnDsoHandle, \
                      &cudnn_dso_handle);                           \
+      EnforceCUDNNLoaded(#__name);                                 \
       void* p_##__name = dlsym(cudnn_dso_handle, #__name);         \
       return reinterpret_cast<cudnn_func>(p_##__name)(args...);    \
     }                                                              \

paddle/platform/dynload/dynamic_loader.cc

@@ -78,12 +78,11 @@ static inline void GetDsoHandleFromDefaultPath(std::string& dso_path,
     *dso_handle = dlopen(dso_path.c_str(), dynload_flags);
     if (nullptr == *dso_handle) {
       if (dso_path == "libcudnn.dylib") {
-        PADDLE_ENFORCE(true,
-                       "Note: [Recommend] copy cudnn into /usr/local/cuda/ \n "
+        LOG(WARNING) << "Note: [Recommend] copy cudnn into /usr/local/cuda/ \n "
                         "For instance, sudo tar -xzf "
                         "cudnn-7.5-osx-x64-v5.0-ga.tgz -C /usr/local \n sudo "
                         "chmod a+r /usr/local/cuda/include/cudnn.h "
-                       "/usr/local/cuda/lib/libcudnn*");
+                        "/usr/local/cuda/lib/libcudnn*";
       }
     }
   }
@@ -92,7 +91,8 @@ static inline void GetDsoHandleFromDefaultPath(std::string& dso_path,
 
 static inline void GetDsoHandleFromSearchPath(const std::string& search_root,
                                               const std::string& dso_name,
-                                              void** dso_handle) {
+                                              void** dso_handle,
+                                              bool throw_on_error = true) {
   int dynload_flags = RTLD_LAZY | RTLD_LOCAL;
   *dso_handle = nullptr;
 
@@ -111,15 +111,19 @@ static inline void GetDsoHandleFromSearchPath(const std::string& search_root,
       GetDsoHandleFromDefaultPath(dlPath, dso_handle, dynload_flags);
     }
   }
-  PADDLE_ENFORCE(nullptr != *dso_handle,
+  auto error_msg =
       "Failed to find dynamic library: %s ( %s ) \n Please specify "
       "its path correctly using following ways: \n Method. set "
       "environment variable LD_LIBRARY_PATH on Linux or "
       "DYLD_LIBRARY_PATH on Mac OS. \n For instance, issue command: "
       "export LD_LIBRARY_PATH=... \n Note: After Mac OS 10.11, "
       "using the DYLD_LIBRARY_PATH is impossible unless System "
-                 "Integrity Protection (SIP) is disabled.",
-                 dlPath, dlerror());
+      "Integrity Protection (SIP) is disabled.";
+  if (throw_on_error) {
+    PADDLE_ENFORCE(nullptr != *dso_handle, error_msg, dlPath, dlerror());
+  } else if (nullptr == *dso_handle) {
+    LOG(WARNING) << string::Sprintf(error_msg, dlPath, dlerror());
+  }
 }
 
 void GetCublasDsoHandle(void** dso_handle) {
@@ -132,9 +136,10 @@ void GetCublasDsoHandle(void** dso_handle) {
 
 void GetCudnnDsoHandle(void** dso_handle) {
 #if defined(__APPLE__) || defined(__OSX__)
-  GetDsoHandleFromSearchPath(FLAGS_cudnn_dir, "libcudnn.dylib", dso_handle);
+  GetDsoHandleFromSearchPath(FLAGS_cudnn_dir, "libcudnn.dylib", dso_handle,
+                             false);
 #else
-  GetDsoHandleFromSearchPath(FLAGS_cudnn_dir, "libcudnn.so", dso_handle);
+  GetDsoHandleFromSearchPath(FLAGS_cudnn_dir, "libcudnn.so", dso_handle, false);
 #endif
 }