In GPUs with compute capability 9.0, all the thread blocks in the cluster are guaranteed to be co-scheduled on a single GPU Processing Cluster (GPC) and allow thread blocks in the cluster to perform hardware-supported synchronization using the Cluster Group API cluster.sync(). Cluster group also provides member functions to query cluster group size in terms of number of threads or number of blocks using num_threads() and num_blocks() API respectively. The rank of a thread or block in the cluster group can be queried using dim_threads() and dim_blocks() API respectively.