STORAGE MEDIUM STORING PERFORMANCE DEGRADATION CAUSE ESTIMATION PROGRAM, PERFORMANCE DEGRADATION CAUSE ESTIMATING DEVICE, AND PERFORMANCE DEGRADATION CAUSE ESTIMATION METHOD

摘要

A performance degradation cause estimation method includes: for each of access types, calculating first access densities in respective time periods obtained by dividing a first time period by a first time length; calculating, based on the calculated first access densities, first variation coefficients of the first access densities; calculating second access densities in respective time periods obtained by dividing a second time period, different from the first time period and identified as a time period in which a response time for the access increases, by a third time length, calculating, based on the calculated second access densities, second variation coefficients of the second access densities in respective time periods; and identifying a cause of the increase in the response time within the second time period based on the result of a test of goodness of fit of distributions of the first and the second variation coefficients.