Guide:POINTTutorial
Use Live DVD version 2, built 5/18/09
Contents
Instrumenting NPB
cd workshop-point/NPB3.1 vi config/make.def
notice that the MPIF77 variable is set to tau_f90.sh this will enable TAU automatic instrumentation with PDT.
Setting TAU configuration
close vi.
setenv TAU_MAKEFILE=$TAU/Makefile-tau-mpi-pdt
This tells TAU to perform a basic instrumentation using PDT and the TAU MPI wrapper library. Now build the BT example program
make bt CLASS=S NPROCS=1
Running NPB example
cd bin mpirun -np 1 ./bt.S.1
TAU Profiles will automatically be generated in the current directory, one profile file per thread.
ls bt.S.1 profile.0.0.0
Viewing TAU profiles
To get a simple summary of the TAU profiles type:
pprof
This gives you a basic idea of how much time was spent in different portions of the application. For example since this was a simple example that ran quickly we have a lot of time spent in MPI_Init (~60%).
