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.
ParaProf
Let's view this profile in TAU ParaProf profile viewer
paraprof
Paraprof will open load the profile a show a single bar representing Node 0. Each colored subsection represents a different routine in NPB the length of a subsection is proportional to the exclusive time spent in that routine.
Right click on the Node 0 label Select "Show Thread Bar Chart"
A new window will pop up ordering each routine by the amount of exclusive time.
Click "Options" -> "Select Metric..." -> "Inclusive"
Now the bars are ordered by inclusive time.