Hub device, operating method of hub device, and cluster system including hub device

An operating method of a hub device including a first memory and a second memory, the operating method comprising:

• updating doorbell information indicating statuses of a plurality of software queues corresponding to a plurality of processors stored in the first memory in response to a request from a host or the plurality of processors;
• updating tag information triggering operations of the plurality of processors stored in the second memory based on the doorbell information;
• selecting a target processor among the plurality of processors based on the tag information;
• selecting a target queue from at least one software queue corresponding to the target processor;
• and
• providing the target processor with doorbell information corresponding to the target queue.

A cluster system comprising:

• a plurality of processors configured to communicate with a host;
• and
• a hub device configured to:
• store doorbell information indicating statuses of a plurality of software queues corresponding to the plurality of processors,
• store tag information triggering operations of the plurality of processors,
• select a target processor from the plurality of processors in response to a request from the host,
• select a target queue from at least one software queue corresponding to the target processor, and
• perform communication between the host and the target processor using the target queue.