While running the application, set the environment variable
PCL_EVENT
or TAU_METRICS
, to specify which hardware performance counter TAU should
use while profiling the application.
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Note |
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By default, only one counter is tracked at a time. To track
more than one counter use |
To select floating point instructions for profiling using
PAPI
, you would:
% configure -papi=/usr/local/packages/papi-3.5.0 % make clean install % cd examples/papi % setenv TAU_METRICS PAPI_FP_INS % a.out
In addition to the following events, you can use native events (see
papi_native) on a given CPU by setting
TAU_
to
PAPI_NATIVE_<event>
. For example:
% setenv PAPI_NATIVE PAPI_NATIVE_PM_BIQ_IDU_FULL_CYC % a.out
By default PAPI
will profile events in all domains
(users space, kernel, hypervisor, etc). You can restrict the set of domains
for papi event profiling by using the
TAU_PAPI_DOMAIN
environment variable with these values (in
a colon separated list, if desired): PAPI_DOM_USER,
PAPI_DOM_KERNEL, PAPI_DOM_SUPERVISOR,
and
PAPI_DOM_OTHER
like thus:
% setenv TAU_PAPI_DOMAIN PAPI_DOM_SUPERVISOR:PAPI_DOM_OTHER