remove dead cpp code for number of CUDA threads

longjon · longjon · commit bc1aa41af7d0 · 2015-11-04T23:58:53.000-08:00
__CUDA_ARCH__ is not defined in host code; the #if was vacuous and
misleading.
diff --git a/include/caffe/util/device_alternate.hpp b/include/caffe/util/device_alternate.hpp
@@ -81,14 +81,8 @@ namespace caffe {
 const char* cublasGetErrorString(cublasStatus_t error);
 const char* curandGetErrorString(curandStatus_t error);
 
-// CUDA: thread number configuration.
-// Use 1024 threads per block, which requires cuda sm_2x or above,
-// or fall back to attempt compatibility (best of luck to you).
-#if __CUDA_ARCH__ >= 200
-    const int CAFFE_CUDA_NUM_THREADS = 1024;
-#else
-    const int CAFFE_CUDA_NUM_THREADS = 512;
-#endif
+// CUDA: use 512 threads per block
+const int CAFFE_CUDA_NUM_THREADS = 512;
 
 // CUDA: number of blocks for threads.
 inline int CAFFE_GET_BLOCKS(const int N) {
