How to allocation in cudaMalloc...?

Asked Jan 15 '18 at 06:44

Active Jan 15 '18 at 08:30

Viewed 52 times

all. I am wondering about how to allocation double pointer to cuda. My code is below.

------------this is structure---

typedef struct vertex vertex;

struct vertex {
    unsigned int vertex_id;
    float pagerank;
    float pagerank_next;
    unsigned int n_successors;
    vertex ** successors;
};

------------these are vertics----

vertex * vertices;
vertices = (vertex *)malloc(n_vertices * sizeof(vertex));
vertex *d_vertices;
cudaMalloc((void **)&d_vertices, n_vertices * sizeof(vertex));

---------these are vertics' succesors. It means double pointers----

vertices[i].successors = (vertex**)malloc(vertices[i].n_successors*sizeof(vertex *));
cudaMalloc((void ***)&d_vertices[i].successors, vertices[i].n_successors * sizeof(vertex *)); // error part.

When I allocate cudaMalloc((void ***)&d_vertices[i].successors, vertices[i].n_successors * sizeof(vertex *));

Visual Studio is stopped... I guess pointer error. But I don't know how to double pointer allocation in cuda. Please, let me know what's wrong in that code. Thank you so much.

best regards

edited Jan 15 '18 at 08:30

talonmies

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asked Jan 15 '18 at 06:44

Dongkyu Joel Jeong

Please search. This question has been asked here literally hundreds of time before and there are a lot of answers you can study – talonmies Jan 15 '18 at 06:53
@talonmies I already read several questions. So I understand about why cudaMalloc use double pointer like a (void**). And then I coded like that (void***) type but It didn't work... So I need help... – Dongkyu Joel Jeong Jan 15 '18 at 07:04
https://stackoverflow.com/q/11874667/681865 – talonmies Jan 15 '18 at 07:33
@talonmies Why don't you flag as duplicate? – Henri Menke Jan 15 '18 at 07:35
@talonmies Thank you so much. Have an awesome day. – Dongkyu Joel Jeong Jan 15 '18 at 07:45
Allocation is a noun. – machine_1 Jan 15 '18 at 07:47
@machine_1 that means number of vertices and number of adjacency nodes. – Dongkyu Joel Jeong Jan 15 '18 at 08:03
@HenriMenke: Because my duplicate flag is an instant duplicate close and I want to be certain before I use it – talonmies Jan 15 '18 at 08:41

How to allocation in cudaMalloc...?

0 Answers0