I have run following code 1 and it returned some out put without error. But when I run same code with cudaMallocManaged() in code 2, it returned unhadled memory exception error (like segmentation fault in linux) in my
visual studio 2012. Please tell me what is the reason for this.
code 1
+++++++++++++
int main(){
int* data;
int* data1;
char* c1;
char* c1_d;
char* c2;
char* c2_d;
char c;
cudaMalloc((void **)&c1_d,sizeof(char)*100);
cudaMalloc((void **)&c2_d,sizeof(char)*100);
c2=(char *)malloc(sizeof(char)*100);
c1="hellloooo";
cudaMemcpy(c1_d,c1,sizeof(char)*100,cudaMemcpyHostToDevice);
kernel(c1_d,c2_d);
cudaDeviceSynchronize();
cudaMemcpy(c2,c2_d,sizeof(char)*100,cudaMemcpyDeviceToHost);
for (int i=0;i
In lines
cudaMallocManaged((void **)c1, sizeof(int)* 100);
cudaMallocManaged((void **)c2, sizeof(int)*100);
you forgot to reference the pointer, it should be
cudaMallocManaged((void **)&c1, sizeof(int)* 100);
cudaMallocManaged((void **)&c2, sizeof(int)*100);
Also, in code2 that you posted, data, data1, c1_d and c2_d are not declared, and c1_d and c2_d are not the destination of your malloc call. This should not compile.
Thank You very much for your answer. Finally I solved my problem. As you told there are some mistakes above code. Here problem was, I initiated c1 with "helooo". So I had to do strcpy() without directly assigning that pointer.
Thank You Very Much again for your Answer.
- Badges
- Science topic
- Similar topics
- Mathematics
- Algebra
- Matrix