1. A computer-implemented calculation method for evaluating a response time in a computer system, wherein a plurality of units of execution are run in parallel on individual processor cores while sharing internal hardware resources, the method comprising: normalizing the utilization state of the computer system with the state of parallelism of the units of execution and evaluating the utilization state; and calculating an expected value of response time in a desired state of parallelism of the units of execution from the normalized utilization state on the basis of queueing theory, wherein changes in an average single-thread performance of the units of execution according to the parallel running state are taken into account.