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NAME | SYNOPSIS | DESCRIPTION | TIMECHART OPTIONS | RECORD OPTIONS | EXAMPLES | SEE ALSO | COLOPHON |
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PERF-TIMECHART(1) perf Manual PERF-TIMECHART(1)
perf-timechart - Tool to visualize total system behavior during a
workload
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.
-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.
-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
$ 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
perf-record(1)
This page is part of the perf (Performance analysis tools for
Linux (in Linux source tree)) project. Information about the
project can be found at
⟨https://perf.wiki.kernel.org/index.php/Main_Page⟩. If you have a
bug report for this manual page, send it to
[email protected]. This page was obtained from the
project's upstream Git repository
⟨http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git⟩
on 2024-06-14. (At that time, the date of the most recent commit
that was found in the repository was 2024-06-13.) If you
discover any rendering problems in this HTML version of the page,
or you believe there is a better or more up-to-date source for
the page, or you have corrections or improvements to the
information in this COLOPHON (which is not part of the original
manual page), send a mail to [email protected]
perf 2017-11-16 PERF-TIMECHART(1)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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