CPU Energy Package - RAPL Component
What it does
This metric provider reads the energy of the CPU Package from the Running Average Power Limit (RAPL) interface via a machine specific register (MSR) that is present on most modern Intel processors. In depth information about RAPL can be found here.
This MSR keeps a running count of the energy used in a specified domain in microJoules. This metric provider specifically reads from the
energy-pkg domain, which gives you the energy used by all the domains.
On kernels > 2.6 all the kernel modules should automatically be loaded.
However just in case run:
sudo modprobe intel_rapl_common # or intel_rapl for kernels < 5
sudo modprobe intel_rapl_msr
sudo modprobe rapl
- Time resolution: 976 micro-seconds
- Energy resolution: 15.3 micro-Joules
- i: specifies interval in milliseconds between measurements
./metric-provider-binary -i 100
This metric provider prints to Stdout a continuous stream of data. The format of the data is as follows:
TIMESTAMP: Unix timestamp, in microseconds
ENERGY_OUTPUT: Energy used during interval, in micro Joules
Any errors are printed to Stderr.
How it works
We use a modified version of the open source code found here: (github)
First we check if the CPU is compatible by reading the cpu info from
/proc/cpuinfo and checking against the following list of supported CPUs:
CPU_SANDYBRIDGE, CPU_SANDYBRIDGE_EP, CPU_IVYBRIDGE, CPU_IVYBRIDGE_EP, CPU_HASWELL, CPU_HASWELL_ULT, CPU_HASWELL_GT3E, CPU_HASWELL_EP, CPU_BROADWELL, CPU_BROADWELL_GT3E, CPU_BROADWELL_EP, CPU_BROADWELL_DE, CPU_SKYLAKE, CPU_SKYLAKE_HS, CPU_SKYLAKE_X, CPU_KNIGHTS_LANDING, CPU_KNIGHTS_MILL, CPU_KABYLAKE_MOBILE, CPU_KABYLAKE, CPU_ATOM_SILVERMONT, CPU_ATOM_AIRMONT, CPU_ATOM_MERRIFIELD, CPU_ATOM_MOOREFIELD, CPU_ATOM_GOLDMONT, CPU_ATOM_GEMINI_LAKE, CPU_TIGER_LAKE
It reads the values from
Note that since it reads the energy used by the entire system, any other load that your system has during a program’s usage run will also be captured in the energy measurement.