Trying out managed memory in CUDA 6.0 gives me operation not supported
when calling cudaMallocManaged()
.
#include "cuda_runtime.h"
#include <stdio.h>
#define CHECK(r) {_check((r), __LINE__);}
void _check(cudaError_t r, int line) {
if (r != cudaSuccess) {
printf("CUDA error on line %d: %s\n", line, cudaGetErrorString(r), line);
exit(0);
}
}
int main()
{
int *c;
CHECK(cudaMallocManaged(&c, sizeof(int)));
*c = 0;
return 0;
}
GeForce GTX 750 Ti (Maxwell), compiled with CUDA 6.0 using compute_50,sm_50. Windows 7 64-bit. Tested with drivers 335.23 (whql) and 337.50 (beta). Visual Studio 2012. Tried 32-bit debug and release builds.
C:\\rd\\projects\\cpp\\test_cuda6\\test_cuda6>"C:\\Program Files\\NVIDIA GPU Computing Toolkit\\CUDA\\v6.0\\bin\\nvcc.exe" -gencode=arch=compute_50,code=\\"sm_50,compute_50\\" --use-local-env --cl-version 2012 -ccbin "C:\\Program Files (x86)\\Microsoft Visual Studio 11.0\\VC\\bin" -I\\C\\common\\inc -I"C:\\Program Files\\NVIDIA GPU Computing Toolkit\\CUDA\\v6.0\\include" -I"C:\\Program Files\\NVIDIA GPU Computing Toolkit\\CUDA\\v6.0\\include" --keep-dir Release -maxrregcount=0 --machine 32 --compile -cudart static -DWIN32 -DNDEBUG -D_CONSOLE -D_MBCS -Xcompiler "/EHsc /W3 /nologo /O2 /Zi /MD " -o Release\\kernel.cu.obj "C:\\rd\\projects\\cpp\\test_cuda6\\test_cuda6\\kernel.cu"
The program runs without error if I replace cudaMallocManaged()
with cudaMalloc()
.
Any ideas on how to get cudaMallocManaged()
working?
Tried 32-bit debug and release builds.
Use a 64 bit debug or release build.
From the documentation :
J.1.4. System Requirements
Unified Memory has three basic requirements:
•a GPU with SM architecture 3.0 or higher (Kepler class or newer)
•a 64-bit host application and operating system, except on Android
•Linux or Windows
64 bit host application means you cannot compile for a 32 bit debug or release build.
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