Event processing time prediction at the CMS Experiment of the Large Hadron Collider

The physics event reconstruction in LHC/CMS is one of the biggest challenges for computing.Among the different tasks that computing systems perform, the reconstruction takes most of the CPUresources that are available. The reconstruction time of a single event varies according to the event complexity.Measurements were done in order to find precisely this correlation, creating means to predict itbased on the physics conditions of the input data.Currently the data processing system do not account that whensplitting a task in chunks(jobs), this can cause a considerablevariation in the job length, thus a considerable increase into theworkflow Estimated Time of Arrival.The goal is to use this estimate on processing time to more efficiently split the work inchunks, considering the CPU time needed for each chunk and due to this,lowering the standard deviation of the job length distribution in aworkflow.