1. A system comprising: an outlier detection component configured to identify an outlier task from a plurality of tasks based on runtimes of the plurality of tasks; a cause evaluation component configured to evaluate a cause of the outlier task, wherein the cause of the outlier task is one or more of: an amount of data processed by the outlier task, contention for resources used to execute the outlier task, or a communication link with congested bandwidth that is used by the outlier task to input or output data, and one or more processing devices configured to execute one or more of the components.