Dynamic instrumentation is achieved through library pre-loading. The libraries chosen for pre-loading determine the scope of instrumentation. Some options include tracking MPI, io, memory, cuda, opencl library calls. MPI instrumentation is included by default the others are enabled by command-line options to tau_exec. More info at the tau_exec manual page. Dynamic instrumentation can be used on both uninstrumented binaries and binaries instrumented via one of the methods below, in this way different layers of instrumentation can be combined.

To use tau_exec place this command before the application executable when running the application. In this example IO instrumentation is requested.

    %> tau_exec -io ./a.out
    %> mpirun -np 4 tau_exec -io ./a.out