QCDimMPI: MPI code for QCD with an improved action. QCDimMPI is a simulation code for pure SU(3) gauge theory with an improved action consisting of 1×1 and 2×1 plaquettes. It uses Fortran77 and the Message Passing Interface Standard, MPI. QCDimMPI is an extended version of QCDMPI. It is portable, allows simulations in any number of dimensions, on any number of processors, and with arbitrary dimensional partitioning. It requires a rather small working area, and yields excellent performance on single processor computers and a wide variety of parallel computers which support MPI. The program provides information on link update time and communications time. In this paper, an outline of QCDimMPI is given, and benchmark results on several parallel computers are reported
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