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Thread: Regarding the kernel function

  1. #1

    Regarding the kernel function

    In my kernel function i have given arguments as three vectors A,B and C respectively.
    A and B are input vector ; C is the output vector
    kernel function is as follows
    {
    int i=get_global_id(0);
    int j;
    for(j=0;j<6;j++)
    {
    B[j]=B[j]+1;
    }
    }

    there was no change in the B vector

    but when i wrote C[j] in place of B[j] inside the for loop, i got the changes in C vector
    C[j]=C[j]+1;
    Can anyone explain why??

  2. #2
    Senior Member
    Join Date
    Oct 2012
    Posts
    166

    Re: Regarding the kernel function

    how do you define your buffer B and C? is buffer B defined as read only and C as write only? or is B defined as
    __global const float* B

  3. #3

    Re: Regarding the kernel function

    i have written a kernel for union function between 2 vectors

    kernel(a,b,c,k)
    {
    int i=get_global_id(0);
    int j;
    int v;
    v=0;
    for(j=0;j<k;j++)
    {
    if(A[i] == B[j])
    {
    v=1;
    }
    }
    if(v==0)
    C[i]=A[i];
    }
    before the kernel function i initialized the values of vector C with 99999
    and i have two vectors A and B which have some common values =, but still the values of vector C remain the same.
    Can you tell why??

  4. #4
    Senior Member
    Join Date
    Oct 2012
    Posts
    166

    Re: Regarding the kernel function

    how are a,b and c defined?
    __kernel foo(__global const a, __global const b, __global const c, int k)
    or
    __kernel foo(__global const a, __global const b, __global c, int k)
    and is c defined as a read/write buffer on host side??

  5. #5

    Re: Regarding the kernel function

    Now the code is running; it was not accessing the GPU through a virtual instance therefore i ran the code on the machine where the Gpu card was installed, now it is running correctly

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