PERF−TIMECHART - Online Linux Manual PageSection : 1
Updated : 03/30/2021
Source : perf
Note : perf Manual

NAMEperf-timechart − Tool to visualize total system behavior during a workload

SYNOPSIS

DESCRIPTIONThere 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 Dont output processor state transitions −p, −−process Select the processes to display, by name or PID −f, −−force Dont 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 its interpreted as number of nanoseconds​. If non−numeric string is given its interpreted as task name​. −−io−skip−eagain Dont 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​. Its 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​. Its 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 recordthen generate timechart and highlight 'gcc' tasks:$ perf timechart −−highlight gccRecord system−wide IO events: $ perf timechart record −Ithen generate timechart:$ perf timechart

SEE ALSOperf-record(1)
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