PERF-TIMECHART(1) perf Manual PERF-TIMECHART(1)
NAME
perf-timechart - Tool to visualize total system behavior during a
workload
SYNOPSIS
DESCRIPTION
There are two variants of perf timechart:
'perf timechart record <command>' to record the system level events
of an arbitrary workload. By default timechart records only scheduler
and CPU events (task switches, running times, CPU power states, etc),
but it's possible to record IO (disk, network) activity using -I argument.
'perf timechart' to turn a trace into a Scalable Vector Graphics file,
that can be viewed with popular SVG viewers such as 'Inkscape'. Depending
on the events in the perf.data file, timechart will contain scheduler/cpu
events or IO events.
In IO mode, every bar has two charts: upper and lower.
Upper bar shows incoming events (disk reads, ingress network packets).
Lower bar shows outgoing events (disk writes, egress network packets).
There are also poll bars which show how much time application spent
in poll/epoll/select syscalls.
TIMECHART OPTIONS
-o, --output=
Select the output file (default: output.svg)
-i, --input=
Select the input file (default: perf.data unless stdin is a fifo)
-w, --width=
Select the width of the SVG file (default: 1000)
-P, --power-only
Only output the CPU power section of the diagram
-T, --tasks-only
Don’t output processor state transitions
-p, --process
Select the processes to display, by name or PID
-f, --force
Don’t complain, do it.
--symfs=<directory>
Look for files with symbols relative to this directory.
-n, --proc-num
Print task info for at least given number of tasks.
-t, --topology
Sort CPUs according to topology.
--highlight=<duration_nsecs|task_name>
Highlight tasks (using different color) that run more than given
duration or tasks with given name. If number is given it’s
interpreted as number of nanoseconds. If non-numeric string is
given it’s interpreted as task name.
--io-skip-eagain
Don’t draw EAGAIN IO events.
--io-min-time=<nsecs>
Draw small events as if they lasted min-time. Useful when you need
to see very small and fast IO. It’s possible to specify ms or us
suffix to specify time in milliseconds or microseconds. Default
value is 1ms.
--io-merge-dist=<nsecs>
Merge events that are merge-dist nanoseconds apart. Reduces number
of figures on the SVG and makes it more render-friendly. It’s
possible to specify ms or us suffix to specify time in milliseconds
or microseconds. Default value is 1us.
RECORD OPTIONS
-P, --power-only
Record only power-related events
-T, --tasks-only
Record only tasks-related events
-I, --io-only
Record only io-related events
-g, --callchain
Do call-graph (stack chain/backtrace) recording
EXAMPLES
$ perf timechart record git pull
[ perf record: Woken up 13 times to write data ]
[ perf record: Captured and wrote 4.253 MB perf.data (~185801 samples) ]
$ perf timechart
Written 10.2 seconds of trace to output.svg.
Record system-wide timechart:
$ perf timechart record
then generate timechart and highlight 'gcc' tasks:
$ perf timechart --highlight gcc
Record system-wide IO events:
$ perf timechart record -I
then generate timechart:
$ perf timechart
SEE ALSO
perf-record(1)
perf 12/18/2024 PERF-TIMECHART(1)
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