Hi,
I asked the constant memory problem early.
And I understand that access constant memory is faster than access global memory.
But the kernel code I programmed is the same speed when I placed the array in constant or global memory , and two cases as shown :
*******constant memory*******
kernel test(constant int * a){
...
int n = rand (); // rand() function is used to generate a integer number and n is not the same for each workitem
int tmp = a[n];
...
}
**************************
*******global memory*******
kernel test(global int * a){
...
int n = rand (); // rand() function is used to generate a integer number and n is not the same for each workitem
int tmp = a[n];
...
}
**************************
Therefore , each workitem might not access the same address of array a.
These cases result in same speed (kernel time)
In nvidia guide , if access constant memory address is not the same address , it will be access sequentially.
Is it the same as Altera OpenCL ?
Thanks
