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1.0 | Use Linux perf interface to collect data about performance events on a per core basis | |||
2.0 | Use jevents library (PMU tools) | |||
3.0 | Report hardware cache events, kernel PMU events, software events, hardware specific events | 4.0 | Should have a configurable interval | |
54.0 | Should have configurable hardware specific events list | |||
65.0 | Provide SNMP support for any collectd values, through an PMU MIB | |||
76.0 | Provide support for multi PMU uncore events | |||
| 7.0 | Provide option to choose all the events from json event list file |
Overview
Performance counters are CPU hardware registers that count hardware events such as instructions executed, cache-misses suffered, or branches mispredicted. They form a basis for profiling applications to trace dynamic control flow and identify hotspots. Linux perf interface provides rich generalized abstractions over hardware specific capabilities.
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The intel_pmu plugin collects information provided by Linux perf interface. It is not done directly, but through jevents API. Using this interface, the intel_pmu plugin should collect collects the following metrics:
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Name
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Type
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Type Instance
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Description
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cpu-cycles
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counter
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cpu-cycles
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instructions
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counter
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instructions
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cache-references
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counter
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cache-references
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cache-misses
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counter
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cache-misses
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Branches
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counter
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Branches
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branch-misses
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counter
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branch-misses
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bus-cycles
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counter
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bus-cycles
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L1-dcache-loads
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counter
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L1-dcache-loads
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L1-dcache-load-misses
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counter
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L1-dcache-load-misses
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L1-dcache-stores
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counter
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L1-dcache-stores
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L1-dcache-store-misses
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counter
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L1-dcache-store-misses
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L1-dcache-prefetches
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counter
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L1-dcache-prefetches
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L1-dcache-prefetch-misses
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counter
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L1-dcache-prefetch-misses
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L1-icache-loads
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counter
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L1-icache-loads
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L1-icache-load-misses
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counter
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L1-icache-load-misses
hardware specific metrics defined in event list file which should contain definitions of PMU events. The list of events to monitor is configurable.
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L1-icache-prefetches
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counter
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L1-icache-prefetches
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L1-icache-prefetch-misses
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counter
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L1-icache-prefetch-misses
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LLC-loads
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counter
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LLC-loads
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LLC-load-misses
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counter
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LLC-load-misses
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LLC-stores
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counter
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LLC-stores
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LLC-store-misses
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counter
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LLC-store-misses
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LLC-prefetches
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counter
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LLC-prefetches
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LLC-prefetch-misses
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counter
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LLC-prefetch-misses
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dTLB-loads
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counter
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dTLB-loads
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dTLB-load-misses
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counter
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dTLB-load-misses
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dTLB-stores
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counter
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dTLB-stores
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dTLB-store-misses
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counter
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dTLB-store-misses
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dTLB-prefetches
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counter
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dTLB-prefetches
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dTLB-prefetch-misses
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counter
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dTLB-prefetch-misses
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iTLB-loads
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counter
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iTLB-loads
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iTLB-load-misses
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counter
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iTLB-load-misses
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branch-loads
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counter
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branch-loads
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branch-load-misses
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counter
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branch-load-misses
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cpu-clock
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counter
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cpu-clock
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task-clock
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counter
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task-clock
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context-switches
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counter
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context-switches
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cpu-migrations
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counter
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cpu-migrations
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page-faults
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counter
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page-faults
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minor-faults
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counter
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minor-faults
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major-faults
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counter
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major-faults
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alignment-faults
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counter
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alignment-faults
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emulation-faults
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counter
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emulation-faults
Plugin configuration
The following configuration options should be supported by intel_pmu collectd plugin:
Name | Description | Comment | |||||
Interval | The interval within which to retrieve statistics on monitored events in seconds | Interval option is supported by collectd and is defined in <LoadPlugin> block. No additional functionality should be developed in intel_pmu plugin to support this option.ReportHardwareCacheEvents | |||||
Enable/disable monitoring of hardware cache events | ReportKernelPMUEvents | Enable/disable monitoring of kernel PMU events | ReportSoftwareEvents | Enable/disable monitoring of software vents | EventList | Path to hardware events list file for current CPU. | File can be downloaded by event_download.py script which is part of pmu-tools package. |
HardwareEvents | String containing comma separated list of hardware specific events to monitor | ||||||
| Cores | Core groups definition. Monitored metrics are reported only for configured cores. If this option is omitted all available cores are monitored. If a group is enclosed in square brackets each core is added individually to a separate group (that is statistics are not aggregated). | Allowed formats: | |||||
| DispatchMultiPmu | Enable/disable dispatching of cloned multi PMU for uncore events. If disabled only total sum is dispatched as single event. If enabled separate metric is dispatched for every counter. | Uncore event example: UNC_CHA_DIR_LOOKUP.NO_SNP. If enabled information about event type is added to type_instance, e.g.: "UNC_CHA_DIR_LOOKUP.NO_SNP:type=30". It allows to distinguish between multiple counters for one event. |
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Here is an example of the plugin configuration section of collectd.conf file:
<Plugin intel_pmu>
ReportHardwareCacheEvents true ReportKernelPMUEvents true ReportSoftwareEvents trueEventList "/var/cache/pmu/GenuineIntel-6-55-core.json"
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