added documentation for likwid flag

pystencils_benchmark/benchmark.py

@@ -95,6 +95,7 @@ def kernel_main(kernels_ast: List[KernelFunction], *,
     Args:
         kernels_ast: A list of the pystencils AST object as returned by create_kernel for benchmarking
         timing: add timing output to the code, prints time per iteration to stdout
+        likwid: add likwid marker to the code
     Returns:
         C code as string
     """
@@ -134,7 +135,8 @@ def kernel_main(kernels_ast: List[KernelFunction], *,
                     size = dim1_size * padding_bytes + np.prod(field.shape) * size_data_type
 
                     assert align % np_dtype.itemsize == 0
-                    offset = ((dim0_size + padding_elements + ghost_layers) % kernel.instruction_set['width']) * size_data_type
+                    offset = ((dim0_size + padding_elements + ghost_layers) %
+                              kernel.instruction_set['width']) * size_data_type
                 else:
                     size = elements * size_data_type
                     offset = 0