Host device performing near data processing function and accelerator system including the same

An accelerator system comprising:

• a host device including a unit processor;
• a memory expansion device;
• and
• an interconnect circuit configured to connect the host device and the memory expansion device,
• wherein the host device among the plurality of memory expansion devices includes:
• a host expansion control circuit configured to receive a near data processing (NDP) request provided to the unit processor;
• and
• a local memory device configured to store data corresponding to the NDP request according to control by the host expansion control circuit, and
• wherein in response to the NDP request, the host expansion control circuit performs:
• a request processing operation to perform a memory operation corresponding to the NDP request on the local memory device, the memory operation including a read operation or a write operation, and
• a computation operation using the data corresponding to the NDP request.