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Linux/tools/perf/Documentation/perf-timechart.txt

  1 perf-timechart(1)
  2 =================
  3 
  4 NAME
  5 ----
  6 perf-timechart - Tool to visualize total system behavior during a workload
  7 
  8 SYNOPSIS
  9 --------
 10 [verse]
 11 'perf timechart' [<timechart options>] {record} [<record options>]
 12 
 13 DESCRIPTION
 14 -----------
 15 There are two variants of perf timechart:
 16 
 17   'perf timechart record <command>' to record the system level events
 18   of an arbitrary workload. By default timechart records only scheduler
 19   and CPU events (task switches, running times, CPU power states, etc),
 20   but it's possible to record IO (disk, network) activity using -I argument.
 21 
 22   'perf timechart' to turn a trace into a Scalable Vector Graphics file,
 23   that can be viewed with popular SVG viewers such as 'Inkscape'. Depending
 24   on the events in the perf.data file, timechart will contain scheduler/cpu
 25   events or IO events.
 26 
 27   In IO mode, every bar has two charts: upper and lower.
 28   Upper bar shows incoming events (disk reads, ingress network packets).
 29   Lower bar shows outgoing events (disk writes, egress network packets).
 30   There are also poll bars which show how much time application spent
 31   in poll/epoll/select syscalls.
 32 
 33 TIMECHART OPTIONS
 34 -----------------
 35 -o::
 36 --output=::
 37         Select the output file (default: output.svg)
 38 -i::
 39 --input=::
 40         Select the input file (default: perf.data unless stdin is a fifo)
 41 -w::
 42 --width=::
 43         Select the width of the SVG file (default: 1000)
 44 -P::
 45 --power-only::
 46         Only output the CPU power section of the diagram
 47 -T::
 48 --tasks-only::
 49         Don't output processor state transitions
 50 -p::
 51 --process::
 52         Select the processes to display, by name or PID
 53 
 54 --symfs=<directory>::
 55         Look for files with symbols relative to this directory.
 56 -n::
 57 --proc-num::
 58         Print task info for at least given number of tasks.
 59 -t::
 60 --topology::
 61         Sort CPUs according to topology.
 62 --highlight=<duration_nsecs|task_name>::
 63         Highlight tasks (using different color) that run more than given
 64         duration or tasks with given name. If number is given it's interpreted
 65         as number of nanoseconds. If non-numeric string is given it's
 66         interpreted as task name.
 67 --io-skip-eagain::
 68         Don't draw EAGAIN IO events.
 69 --io-min-time=<nsecs>::
 70         Draw small events as if they lasted min-time. Useful when you need
 71         to see very small and fast IO. It's possible to specify ms or us
 72         suffix to specify time in milliseconds or microseconds.
 73         Default value is 1ms.
 74 --io-merge-dist=<nsecs>::
 75         Merge events that are merge-dist nanoseconds apart.
 76         Reduces number of figures on the SVG and makes it more render-friendly.
 77         It's possible to specify ms or us suffix to specify time in
 78         milliseconds or microseconds.
 79         Default value is 1us.
 80 
 81 RECORD OPTIONS
 82 --------------
 83 -P::
 84 --power-only::
 85         Record only power-related events
 86 -T::
 87 --tasks-only::
 88         Record only tasks-related events
 89 -I::
 90 --io-only::
 91         Record only io-related events
 92 -g::
 93 --callchain::
 94         Do call-graph (stack chain/backtrace) recording
 95 
 96 EXAMPLES
 97 --------
 98 
 99 $ perf timechart record git pull
100 
101   [ perf record: Woken up 13 times to write data ]
102   [ perf record: Captured and wrote 4.253 MB perf.data (~185801 samples) ]
103 
104 $ perf timechart
105 
106   Written 10.2 seconds of trace to output.svg.
107 
108 Record system-wide timechart:
109 
110   $ perf timechart record
111 
112   then generate timechart and highlight 'gcc' tasks:
113 
114   $ perf timechart --highlight gcc
115 
116 Record system-wide IO events:
117 
118   $ perf timechart record -I
119 
120   then generate timechart:
121 
122   $ perf timechart
123 
124 SEE ALSO
125 --------
126 linkperf:perf-record[1]

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