“unsigned int *”类型的参数与“size_t *”类型的参数不兼容

Question

I have this code in cuda with c++:

// Variables
float        *query_dev;
float        *ref_dev;
float        *dist_dev;
int          *ind_dev;
cudaArray    *ref_array;
cudaError_t  result;
size_t       query_pitch;
size_t       query_pitch_in_bytes;
size_t       ref_pitch;
size_t       ref_pitch_in_bytes;
size_t       ind_pitch;
size_t       ind_pitch_in_bytes;
size_t       max_nb_query_traited;
size_t       actual_nb_query_width;
unsigned int memory_total;
unsigned int memory_free;

// Check if we can use texture memory for reference points
unsigned int use_texture = ( ref_width*size_of_float<=MAX_TEXTURE_WIDTH_IN_BYTES && height*size_of_float<=MAX_TEXTURE_HEIGHT_IN_BYTES );

// CUDA Initialisation
cuInit(0);

// Check free memory using driver API ; only (MAX_PART_OF_FREE_MEMORY_USED*100)% of   memory will be used

CUcontext cuContext;
CUdevice  cuDevice=0;
cuCtxCreate(&cuContext, 0, cuDevice);
cuMemGetInfo(&memory_free, &memory_total);

I got an error for compiling at the line: cuMemGetInfo(&memory_free, &memory_total);

The errors are:

app.cu(311): error: argument of type "unsigned int *" is incompatible with parameter of type "size_t *"

app.cu(311): error: argument of type "unsigned int *" is incompatible with parameter of type "size_t

311 is the line of: cuMemGetInfo(&memory_free, &memory_total);

I have no clue what is this error, do you have any idea about this?

Answer 1

Change the following lines:

unsigned int memory_total;
unsigned int memory_free;

to:

size_t memory_total;
size_t memory_free;

You're probably trying an old code that was initially built before CUDA 3.0.

Source

Answer 2

The error says that size_t and unsigned int are different types so you can't pass a pointer to one to a function that expects the other.

Either change the types of memory_free and memory_total to size_t or use temporary size_t variables and then copy the value into memory_free and memory_total

PS You posted way too much source code, please try to minimize your examples.

Answer 3

Can't you define both

unsigned int memory_total;
unsigned int memory_free;

as

size_t memory_total;
size_t memory_free;