209 lines
5.0 KiB
Plaintext
209 lines
5.0 KiB
Plaintext
perf-daemon(1)
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==============
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NAME
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----
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perf-daemon - Run record sessions on background
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SYNOPSIS
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--------
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[verse]
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'perf daemon'
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'perf daemon' [<options>]
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'perf daemon start' [<options>]
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'perf daemon stop' [<options>]
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'perf daemon signal' [<options>]
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'perf daemon ping' [<options>]
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DESCRIPTION
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-----------
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This command allows to run simple daemon process that starts and
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monitors configured record sessions.
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You can imagine 'perf daemon' of background process with several
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'perf record' child tasks, like:
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# ps axjf
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...
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1 916507 ... perf daemon start
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916507 916508 ... \_ perf record --control=fifo:control,ack -m 10M -e cycles --overwrite --switch-output -a
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916507 916509 ... \_ perf record --control=fifo:control,ack -m 20M -e sched:* --overwrite --switch-output -a
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Not every 'perf record' session is suitable for running under daemon.
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User need perf session that either produces data on query, like the
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flight recorder sessions in above example or session that is configured
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to produce data periodically, like with --switch-output configuration
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for time and size.
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Each session is started with control setup (with perf record --control
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options).
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Sessions are configured through config file, see CONFIG FILE section
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with EXAMPLES.
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OPTIONS
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-------
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-v::
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--verbose::
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Be more verbose.
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--config=<PATH>::
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Config file path. If not provided, perf will check system and default
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locations (/etc/perfconfig, $HOME/.perfconfig).
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--base=<PATH>::
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Base directory path. Each daemon instance is running on top
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of base directory. Only one instance of server can run on
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top of one directory at the time.
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All generic options are available also under commands.
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START COMMAND
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-------------
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The start command creates the daemon process.
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-f::
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--foreground::
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Do not put the process in background.
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STOP COMMAND
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------------
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The stop command stops all the session and the daemon process.
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SIGNAL COMMAND
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--------------
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The signal command sends signal to configured sessions.
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--session::
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Send signal to specific session.
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PING COMMAND
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------------
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The ping command sends control ping to configured sessions.
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--session::
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Send ping to specific session.
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CONFIG FILE
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-----------
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The daemon is configured within standard perf config file by
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following new variables:
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daemon.base:
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Base path for daemon data. All sessions data are
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stored under this path.
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session-<NAME>.run:
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Defines new record session. The value is record's command
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line without the 'record' keyword.
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Each perf record session is run in daemon.base/<NAME> directory.
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EXAMPLES
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--------
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Example with 2 record sessions:
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# cat ~/.perfconfig
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[daemon]
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base=/opt/perfdata
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[session-cycles]
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run = -m 10M -e cycles --overwrite --switch-output -a
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[session-sched]
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run = -m 20M -e sched:* --overwrite --switch-output -a
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Starting the daemon:
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# perf daemon start
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Check sessions:
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# perf daemon
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[603349:daemon] base: /opt/perfdata
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[603350:cycles] perf record -m 10M -e cycles --overwrite --switch-output -a
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[603351:sched] perf record -m 20M -e sched:* --overwrite --switch-output -a
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First line is daemon process info with configured daemon base.
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Check sessions with more info:
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# perf daemon -v
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[603349:daemon] base: /opt/perfdata
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output: /opt/perfdata/output
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lock: /opt/perfdata/lock
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up: 1 minutes
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[603350:cycles] perf record -m 10M -e cycles --overwrite --switch-output -a
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base: /opt/perfdata/session-cycles
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output: /opt/perfdata/session-cycles/output
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control: /opt/perfdata/session-cycles/control
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ack: /opt/perfdata/session-cycles/ack
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up: 1 minutes
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[603351:sched] perf record -m 20M -e sched:* --overwrite --switch-output -a
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base: /opt/perfdata/session-sched
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output: /opt/perfdata/session-sched/output
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control: /opt/perfdata/session-sched/control
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ack: /opt/perfdata/session-sched/ack
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up: 1 minutes
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The 'base' path is daemon/session base.
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The 'lock' file is daemon's lock file guarding that no other
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daemon is running on top of the base.
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The 'output' file is perf record output for specific session.
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The 'control' and 'ack' files are perf control files.
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The 'up' number shows minutes daemon/session is running.
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Make sure control session is online:
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# perf daemon ping
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OK cycles
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OK sched
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Send USR2 signal to session 'cycles' to generate perf.data file:
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# perf daemon signal --session cycles
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signal 12 sent to session 'cycles [603452]'
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# tail -2 /opt/perfdata/session-cycles/output
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[ perf record: dump data: Woken up 1 times ]
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[ perf record: Dump perf.data.2020123017013149 ]
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Send USR2 signal to all sessions:
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# perf daemon signal
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signal 12 sent to session 'cycles [603452]'
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signal 12 sent to session 'sched [603453]'
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# tail -2 /opt/perfdata/session-cycles/output
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[ perf record: dump data: Woken up 1 times ]
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[ perf record: Dump perf.data.2020123017024689 ]
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# tail -2 /opt/perfdata/session-sched/output
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[ perf record: dump data: Woken up 1 times ]
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[ perf record: Dump perf.data.2020123017024713 ]
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Stop daemon:
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# perf daemon stop
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SEE ALSO
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--------
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linkperf:perf-record[1], linkperf:perf-config[1]
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