Computer system and control method therefor

A computer system, comprising:

• a plurality of arithmetic parts;
• and
• a host part connected to the plurality of arithmetic parts and configured to control the plurality of arithmetic parts,
• wherein processed data is transferred between the plurality of arithmetic parts,
• the arithmetic part includes trace parts which record trace data using detection of a predetermined event from input data as a trigger,
• the trace data has a timestamp value which is a detection time of the event based on an operating frequency of the arithmetic part, and
• the timestamp values of the plurality of arithmetic parts are synchronized.

A method for controlling a computer system which includes a plurality of arithmetic parts and a host part, in which the plurality of arithmetic parts obtain a timestamp value on the basis of an operating frequency of the arithmetic parts using detection of a predetermined event from input data as a trigger, and the data is processed and recorded, the method comprising:

• setting, by the host part, a predetermined value to the timestamp value;
• comparing, by the host part, the timestamp value with a reference value;
• and
• setting, by the host part, the timestamp value to the predetermined value when the timestamp value exceeds an allowable range of the reference value.