1. A system for identifying a concurrency level of a first processing stage from a plurality of processing stages in a distributed system, comprising: an interface unit configured to receive measurement data indicating a starting time and an ending time of the first processing stage in each of a plurality of job requests; a concurrency determination unit configured to sort the measurement data in an increasing time order; and a concurrency determination database configured to store the sorted measurement data, wherein the concurrency determination unit is further configured to traverse the sorted measurement data beginning with a first portion of the measurement data having an earliest time, and ending with a last portion of the measurement data having a latest time, increase the concurrency level upon determining that a current portion of the measurement data indicates a starting time of the first processing stage, and decrease the concurrency level upon determining that the current portion of the measurement data indicates an ending time of the first processing stage, wherein the interface unit is further configured to output a maximum concurrency level of the first processing stage equal to a largest value of the concurrency level.