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Hi,
Attached is a perfevent PMDA for general review/comments/suggestions. This linux-specific pmda exposes the hardware performance counters available on recent x86 systems. This pmda has been running on our cluster the last 10 months without problems (I've
been meaning to submit this for inclusion for a while!).
Notes:
The PMDA uses the libpfm4 library to access the hardware performance counters so any counters that are supported in libpfm4 should be available. Also included is the ability to read the Intel RAPL counters via direct MSR access.
The PMDA supports automatically loading different counters for each hardware architecture. A single configuration file is used to specify the desired counters for each chipset family. The configuration file allows different counters to be programmed on
different CPUs and supports round-robin assignment of uncore counters needed for some AMD chips. The default configuration is known to work on Intel Sandybridge EP, Intel Westmere DP, Intel Nehalem EX and Intel Core2 chipsets.
The PMDA accesses the system-wide hardware counters and runs as root. This means that the hardware counters are unavailable to use by normal unprivileged user applications when they are in use by the PMDA. The PMDA provides a mechanism to temporarily disable
the system-wide counters in order to allow normal users to be able to use the counters if they wish.
Build requirements:
- libpfm4
- flex
Cheers,
Joe
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