Abstract We present the Multiscale Coupling Library and Environment: MUSCLE 2. This
multiscale component-based execution environment has a simple to use Java, C++, C,
Python and Fortran API, compatible with MPI, OpenMP and threading codes. We
demonstrate its local and distributed computing capabilities and compare its performance to
MUSCLE 1, file copy, MPI, MPWide, and GridFTP. The local throughput of MPI is about two
times higher, so very tightly coupled code should use MPI as a single submodel of MUSCLE …