1PERF-TIMECHART(1)                 perf Manual                PERF-TIMECHART(1)
2
3
4

NAME

6       perf-timechart - Tool to visualize total system behavior during a
7       workload
8

SYNOPSIS

DESCRIPTION
11       There are two variants of perf timechart:
12
13           'perf timechart record <command>' to record the system level events
14           of an arbitrary workload. By default timechart records only scheduler
15           and CPU events (task switches, running times, CPU power states, etc),
16           but it's possible to record IO (disk, network) activity using -I argument.
17
18           'perf timechart' to turn a trace into a Scalable Vector Graphics file,
19           that can be viewed with popular SVG viewers such as 'Inkscape'. Depending
20           on the events in the perf.data file, timechart will contain scheduler/cpu
21           events or IO events.
22
23           In IO mode, every bar has two charts: upper and lower.
24           Upper bar shows incoming events (disk reads, ingress network packets).
25           Lower bar shows outgoing events (disk writes, egress network packets).
26           There are also poll bars which show how much time application spent
27           in poll/epoll/select syscalls.
28

TIMECHART OPTIONS
30       -o, --output=
31           Select the output file (default: output.svg)
32
33       -i, --input=
34           Select the input file (default: perf.data unless stdin is a fifo)
35
36       -w, --width=
37           Select the width of the SVG file (default: 1000)
38
39       -P, --power-only
40           Only output the CPU power section of the diagram
41
42       -T, --tasks-only
43           Don’t output processor state transitions
44
45       -p, --process
46           Select the processes to display, by name or PID
47
48       -f, --force
49           Don’t complain, do it.
50
51       --symfs=<directory>
52           Look for files with symbols relative to this directory.
53
54       -n, --proc-num
55           Print task info for at least given number of tasks.
56
57       -t, --topology
58           Sort CPUs according to topology.
59
60       --highlight=<duration_nsecs|task_name>
61           Highlight tasks (using different color) that run more than given
62           duration or tasks with given name. If number is given it’s
63           interpreted as number of nanoseconds. If non-numeric string is
64           given it’s interpreted as task name.
65
66       --io-skip-eagain
67           Don’t draw EAGAIN IO events.
68
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. Default
73           value is 1ms.
74
75       --io-merge-dist=<nsecs>
76           Merge events that are merge-dist nanoseconds apart. Reduces number
77           of figures on the SVG and makes it more render-friendly. It’s
78           possible to specify ms or us suffix to specify time in milliseconds
79           or microseconds. Default value is 1us.
80

RECORD OPTIONS
82       -P, --power-only
83           Record only power-related events
84
85       -T, --tasks-only
86           Record only tasks-related events
87
88       -I, --io-only
89           Record only io-related events
90
91       -g, --callchain
92           Do call-graph (stack chain/backtrace) recording
93

EXAMPLES
95       $ perf timechart record git pull
96
97           [ perf record: Woken up 13 times to write data ]
98           [ perf record: Captured and wrote 4.253 MB perf.data (~185801 samples) ]
99
100       $ perf timechart
101
102           Written 10.2 seconds of trace to output.svg.
103
104       Record system-wide timechart:
105
106           $ perf timechart record
107
108           then generate timechart and highlight 'gcc' tasks:
109
110           $ perf timechart --highlight gcc
111
112       Record system-wide IO events:
113
114           $ perf timechart record -I
115
116           then generate timechart:
117
118           $ perf timechart
119

SEE ALSO
121       perf-record(1)
122
123
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125perf                              03/30/2021                 PERF-TIMECHART(1)



        

    


            
        

        

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