copenclopencl-c

OpenCL Host ran out of Memory in trivial Kernel

I am trying to do the kernel from in a sample learning program with 1024 entries of input buffer and output buffer both arrays of floating point entries of 32bits. https://anteru.net/blog/2012/getting-started-with-opencl-part-2/

What happens is that my code gives me a CL_OUT_OF_HOST_MEMORY when trying to compile the kernel

And this is my main.c:

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#define CL_TARGET_OPENCL_VERSION 210
#include "CL/cl.h"

char* program_src = "__kernel void SAXPY (__global float* x, __global float* y, float a)\n"
"{\n"
"const int i = get_global_id (0);\n"
"y [i] += a * x [i];\n"
"}\n";

int main() {
    cl_platform_id platform_ids[16];
    cl_uint platform_count;

    if (clGetPlatformIDs(16, &platform_ids, &platform_count) != CL_SUCCESS) {
        return EXIT_FAILURE;
    }
    printf("%i cl platform(s) found\n", platform_count);

    if (platform_count == 0) {
        return EXIT_FAILURE;
    }

    printf("choosing platform 0...\n");

    cl_device_id device_ids[16];
    cl_int device_count;
    if (clGetDeviceIDs(platform_ids[0], CL_DEVICE_TYPE_ALL, 16, &device_ids, &device_count) != CL_SUCCESS) {
        return EXIT_FAILURE;
    }
    printf("%i cl device(s) found on platform 0\n", device_count);

    if (device_count == 0) {
        return EXIT_FAILURE;
    }

    cl_device_id device = device_ids[0];

    printf("** running test **\n");

    cl_int cl_fehler;
    cl_context ctx = clCreateContext(NULL, 1, &device, NULL, NULL, &cl_fehler);
    if (ctx == NULL) {
        printf("Fehler: %i\n", cl_fehler);
        return EXIT_FAILURE;
    }

    printf("Am clCommandQueue\n");
    cl_fehler = CL_SUCCESS;
    cl_command_queue queue = clCreateCommandQueue(ctx, device, 0, &cl_fehler);
    if (cl_fehler != CL_SUCCESS) {
        printf("Fehler: %i\n", cl_fehler);
        return EXIT_FAILURE;
    }

    // Replace 1 mit Zahlen von Gärate IDs
    printf("Am clCreateProgram\n");
    cl_fehler = CL_SUCCESS;
    cl_program program = clCreateProgramWithSource(ctx, 1, &program_src, NULL, &cl_fehler);
    if (cl_fehler != CL_SUCCESS) {
        printf("Fehler: %i\n", cl_fehler);
        return EXIT_FAILURE;
    }

    printf("Am clCreateKernel\n");
    cl_fehler = CL_SUCCESS;
    cl_kernel kernel = clCreateKernel(program, "saxpy", &cl_fehler);
    if (cl_fehler != CL_SUCCESS) {
        printf("Fehler: %i\n", cl_fehler);
        return EXIT_FAILURE;
    }
    // No point in share the rest of the code because the problem is being hapenning here
}
Solution

  • There are at least 2 issues with the posted code: