Difference between revisions of "Guide:POINTTutorial"
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Now the bars are ordered by inclusive time. | Now the bars are ordered by inclusive time. | ||
| − | + | ==Selective Instrumentation== | |
Click on the "TAU: ParaProf Manager" window | Click on the "TAU: ParaProf Manager" window | ||
| Line 59: | Line 59: | ||
Select "Create Selective Instrumentation File" | Select "Create Selective Instrumentation File" | ||
| − | A window will pop up showing a number of routines. | + | A window will pop up showing a number of routines. These routine have been flagged by TAU as lightweight routine. Routines that are less than 10 microseconds per call and are called more than 100,000 times (see above). Excluding these routines from instrumentation will help control the instrumentation overhead. |
| + | |||
| + | Click "Save" | ||
| + | Close ParaProf | ||
Revision as of 19:16, 19 May 2009
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.
Selective Instrumentation
Click on the "TAU: ParaProf Manager" window Right click on the trial name: "bin/NPB3.1/...." Select "Create Selective Instrumentation File"
A window will pop up showing a number of routines. These routine have been flagged by TAU as lightweight routine. Routines that are less than 10 microseconds per call and are called more than 100,000 times (see above). Excluding these routines from instrumentation will help control the instrumentation overhead.
Click "Save" Close ParaProf
