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