PARCOACH Extension for Static MPI Nonblocking and Persistent Communication Validation

The Message Passing Interface (MPI) is a parallel programming model used to exchange data between working units in different nodes of a supercomputer. While MPI blocking operations return when the communication is complete, non-blocking and persistent operations return before the communication is complete, enabling a developer to hide communication latency. However the usage of these latter comes with additional rules the user has to abide to. This is error prone, which makes verification tools valuable for MPI program writers. PARCOACH is a framework that detects MPI collective errors using a static/dynamic analysis. In this paper we present an extension of PARCOACH static analysis to detect misuse of MPI nonblocking and persistent communications. Our new analysis adds the detection of four new error classes related to these types of communications. Its implementation was tested on several MPI micro-benchmarks, and on some CORAL or Mantevo benchmarks on which we observed an acceptable overhead at compile-time.