I want to know time taken by a Reasoner to get all inferences. How to get that ? Also want to get all statistic information about total tasks performed by the reasoner.
What are the factors affecting the reasoner's performance ?
Reasoners do not compute 'all' inferences - they compute the inferences required for a particular task.
The factors influencing reasoner performance are many, and how to predict performance over any ontology is an open research question. You can have a look at the results of the ORE competition for comparison of multiple reasoners.
https://www.w3.org/community/owled/ore-2015-workshop/competition/