Max number of wavefronts per compute unit

OpenCL
1

Hi guys, i am new on OpenCL;

i have the following AMD GPU specifications:
7 compute units, each one with a wavefront of 64 work-items
max workgroup size = 256
max work-item size is (1024,1024,1024)
Local memory size = 32KB
Local memory size per CU = 64KB

In this scenario, can someone tell me how i can determine the maximum number of wavefronts that a single CU can manage contemporaneously?

is this value equal to

  1. Local memory size per CU/Local memory size = 2
    or
  2. max workgroup size/ 64 = 4

Thank you very much for the help