# default cluster size is 8 with OpenCL and 4 with SYCL for now
if(${_gmx_gpu_uppercase} STREQUAL "OPENCL")
set(_gmx_gpu_nb_cluster_size_value 8)
- else()
- set(_gmx_gpu_nb_cluster_size_value 4)
+ elseif(GMX_GPU_SYCL)
+ if (GMX_SYCL_HIPSYCL AND NOT GMX_HIPSYCL_HAVE_LEVELZERO_TARGET)
+ set(_gmx_gpu_nb_cluster_size_value 8)
+ else()
+ # Either DPCPP or hipSYCL targeting Intel Level0
+ set(_gmx_gpu_nb_cluster_size_value 4)
+ endif()
endif()
endif()
set(GMX_GPU_NB_CLUSTER_SIZE ${_gmx_gpu_nb_cluster_size_value} CACHE STRING "Cluster size used by the nonbonded kernel. Set to 4 for Intel GPUs.")