Merge pull request #15846 from cjld/fix_cupti

Fix cupti

paddle/fluid/platform/profiler.cc

@@ -112,12 +112,11 @@ double Event::CpuElapsedMs(const Event& e) const {
 }
 
 double Event::CudaElapsedMs(const Event& e) const {
-#ifdef PADDLE_WITH_CUDA
 #ifdef PADDLE_WITH_CUPTI
   return gpu_ns_ / 1000000.0;
-#endif
 #else
-  PADDLE_THROW("CUDA is not enabled");
+  LOG_FIRST_N(WARNING, 1) << "CUDA CUPTI is not enabled";
+  return 0;
 #endif
 }