CUDA: identifier "cudaMemGetInfo" is undefined - cuda

Question

To estimate how much data the program may process in one kernel launch i try to get some memory info with cudaMemGetInfo(). However, the compiler tells me this:
error: identifier "cudaMemGetInfo" is undefined
Other functions like cudaGetDeviceProperties(); work fine. Do I have to install a certain CUDA-version? The library description does not contain infos about the version and so on.
EDIT: the smallest possible code. cudaSetDevice() generates no compiler error while cudaMemGetInfo() does
#include <cuda.h>
#include <cuda_runtime_api.h>
int main(){
unsigned int f, t;
cudaSetDevice(0);
cudaMemGetInfo(&f, &t);
return 0;
}
EDIT 2:
I'm on Linux using "Cuda compilation tools, release 2.0, V0.2.1221" (nvcc).
As I tried to get the cuda driver version installed with cudaDriverGetVersion() the same error occured (same thing when I use the driver function cuDriverGetVersion()).
It seems that the system wont let me know any detail about itself...

Answer 1

For the very old version of CUDA you are using, cudaMemGetInfo is not part of the runtime API. It has a counterpart in the driver cuMemGetInfo, which can be used instead. Note that using the driver API version of this call will require establishing a context first. This should work on CUDA 2.x:
// CUDA 2.x version
#include <cstdio>
#include <cuda.h>
#include <cuda_runtime_api.h>
int main(){
unsigned int f, t;
cudaSetDevice(0);
cudaFree(0); // This will establish a context on the device
cuMemGetInfo(&f, &t);
fprintf(stdout,"%d %d\n",f/1024,t/1024);
return 0;
}
EDIT: this answer applied to CUDA 3.0 and later:
Your problem isn't cudaMemGetInfo, it is the arguments you are supplying it. I would predict that this:
// CUDA 3.0 or later version
#include <cuda.h>
#include <cuda_runtime_api.h>
int main(){
size_t f, t;
cudaSetDevice(0);
cudaMemGetInfo(&f, &t);
return 0;
}
will work where your example fails. Note that nvcc uses a host C++ compiler to compile host code, and it will not find instances of API functions with incorrect arguments. Note that the prototype of cudaMemGetInfo is
cudaError_t cudaMemGetInfo(size_t * free, size_t * total)
and that the arguments should be size_t, which is not the same as unsigned int on many platforms.

Answer 2

to fix this error:
error: argument of type "unsigned int *" is incompatible with parameter of type "size_t *".
I found from nvidia technical report for cuda 3.2 that:
Driver API functions that accept or return memory sizes, such as cuMemAlloc() and cuMemGetInfo(), now use size_t for this purpose rather than unsigned int.
so you must change *.cu code, as the following lines:
Incorrect code:
unsigned int free, total;
cuMemGetInfo(&free, &total);
Correct code:
size_t free, total;
cuMemGetInfo(&free, &total);