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taskstats_exporter: A Prometheus exporter for Linux process statistics

This is a Prometheus exporter for performance information about Linux tasks. The following information is collected:

  • task accounting statistics from netlink for the task itself and all of its threads, living or dead
  • basic process statistics from /proc/<pid>/stat
  • proportional set size
  • block I/O delays and scheduler statistics for niced threads

Installation and usage

The taskstats exporter is installable as a Python egg. It expects to read named pidfiles from a directory. The directory is automatically scanned on each prometheus scrape: there is no need to restart the exporter when the directory contents change. The user running taskstats_exporter must be root or have CAP_NET_ADMIN.

Usage:

# taskstats_exporter <pidfiles_dir> <listen_port>

Example:

$ mkdir exporter_pidfiles
$ ln -s /run/cassandra/cassandra.pid exporter_pidfiles/cassandra
$ taskstats_exporter exporter_pidfiles 8080
$ curl 127.0.0.1:8080
taskstat_cpu_count{name="cassandra", pid="16923"} 8365887
taskstat_cpu_delay_total{name="cassandra", pid="16923"} 659867655322
taskstat_blkio_count{name="cassandra", pid="16923"} 477
taskstat_blkio_delay_total{name="cassandra", pid="16923"} 2508392517
taskstat_swapin_count{name="cassandra", pid="16923"} 41
taskstat_swapin_delay_total{name="cassandra", pid="16923"} 164895486
taskstat_nvcsw{name="cassandra", pid="16923"} 8049063
taskstat_nivcsw{name="cassandra", pid="16923"} 267691
procstat_utime{name="cassandra", pid="16923"} 323090000000
procstat_stime{name="cassandra", pid="16923"} 76490000000
procstat_cutime{name="cassandra", pid="16923"} 140000000
procstat_cstime{name="cassandra", pid="16923"} 160000000
procstat_num_threads{name="cassandra", pid="16923"} 81
procstat_rss{name="cassandra", pid="16923"} 414740
procmaps_pss{name="cassandra", pid="16923"} 416220
thread_blkio_delay{name="cassandra", pid="16923", nice="3"} 0
thread_blkio_delay{name="cassandra", pid="16923", nice="4"} 0
thread_schedstat_oncpu{name="cassandra", pid="16923", nice="3"} 4000000000
thread_schedstat_oncpu{name="cassandra", pid="16923", nice="4"} 6055831288000
thread_schedstat_waiting{name="cassandra", pid="16923", nice="3"} 28283162000
thread_schedstat_waiting{name="cassandra", pid="16923", nice="4"} 11788537641000
thread_schedstat_slices{name="cassandra", pid="16923", nice="3"} 35
thread_schedstat_slices{name="cassandra", pid="16923", nice="4"} 101519