Hardware counters

Nanos6 offers an infrastructure to obtain hardware counter statistics of tasks with various backends. The usage of this API is controlled through the Nanos6 configuration file. Currently, Nanos6 supports the PAPI, RAPL and PQoS backends. All the available hardware counter backends are listed in the default configuration file, found in the scripts folder. To enable any of these, modify the false fields and change them to true. Specific counters can be enabled or disabled by adding or removing their name from the list of counters inside each backend subsection.

Next we showcase a simplified version of the hardware counter section of the configuration file, where the PAPI backend is enabled with counters that monitor the total number of instructions and cycles, and the PAPI backend is enabled as well:

[hardware_counters]
    [hardware_counters.papi]
        enabled = true
        counters = ["PAPI_TOT_INS", "PAPI_TOT_CYC"]
    [hardware_counters.rapl]
        enabled = true