powercap_write_test

This test demonstrates the ability of PAPI to use the Linux powercap interface to read and

write power constraints to gather energy information and apply power

constraints.

See the instructions in the components/powercap directory to build the component.

It works by using PAPI to read information from Linux powercap interface and write

it to a file.  The code repeatedly runs an OpenMP multithreaded

routine (primes) to stress the CPU.  The routine is called 100 times,

and at each call the power measurements are read using

PAPI_read(EventSet, values) and printed to a file.  At every 10th call

the power caps for the power packages are adjusted using

PAPI_write(EventSet, values ).

Build and run the test as follows

   cd components/powercap/utils/

   make clean

   make

   ./powercap_write_test

In the output file, you can see the power values that are SET and the

power values that are READ.  By comparing them you can confirm that

the component is performing as expected.