Data transmission device, data transmission method, and storage medium

A data transmission method, comprising:

• detecting writing to a memory to which writing is carried out by a processor and identifying an update range which is a range for which writing is detected in the memory;
• in response to receiving, from the processor, a transfer instruction which specifies a transfer range in the memory, extracting, as a transfer execution range, a range included in the update range within the received transfer range;
• and
• carrying out data transfer to transfer data stored in the transfer execution range in the memory to a transfer-destination node.

A non-transitory computer readable recording medium storing a data transmission program making a computer, which includes a memory and a processor to carry out writing to the memory, operate as:

• a detection unit that detects writing to the memory and identifies an update range which is a range for which writing is detected in the memory;
• an extraction unit that, in response to receiving, from the processor, a transfer instruction which specifies a transfer range in the memory, extracts, as a transfer execution range, a range included in the update range within the received transfer range;
• and
• a transfer unit that carries out data transfer to transfer data stored in the transfer execution range in the memory to a transfer-destination node.