INFORMATION PROCESSING DEVICE AND CONTROL METHOD

An information processing device includes: an arithmetic processing device including a plurality of arithmetic processing units and a memory, wherein the arithmetic processing device configured to: estimate a first amount of operation in a given part of a program stored in the memory before execution of the program; determine a first arithmetic processing unit number indicating a number of arithmetic processing units that execute the given part, based on the first amount of operation and a reference value for parallelizing processing of the given part; and obtain a second arithmetic processing unit number by adjusting the first arithmetic processing unit number based on a second amount of operation when the given part is executed by the first arithmetic processing unit number and the reference value.