Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/tools/perf/Documentation/perf-sched.txt
10821 views
1
perf-sched(1)

2
==============

3


4
NAME

5
----

6
perf-sched - Tool to trace/measure scheduler properties (latencies)

7


8
SYNOPSIS

9
--------

10
[verse]

11
'perf sched' {record|latency|map|replay|trace}

12


13
DESCRIPTION

14
-----------

15
There are five variants of perf sched:

16


17
  'perf sched record <command>' to record the scheduling events

18
  of an arbitrary workload.

19


20
  'perf sched latency' to report the per task scheduling latencies

21
  and other scheduling properties of the workload.

22


23
  'perf sched trace' to see a detailed trace of the workload that

24
  was recorded.

25


26
  'perf sched replay' to simulate the workload that was recorded

27
  via perf sched record. (this is done by starting up mockup threads

28
  that mimic the workload based on the events in the trace. These

29
  threads can then replay the timings (CPU runtime and sleep patterns)

30
  of the workload as it occurred when it was recorded - and can repeat

31
  it a number of times, measuring its performance.)

32


33
  'perf sched map' to print a textual context-switching outline of

34
  workload captured via perf sched record.  Columns stand for

35
  individual CPUs, and the two-letter shortcuts stand for tasks that

36
  are running on a CPU. A '*' denotes the CPU that had the event, and

37
  a dot signals an idle CPU.

38


39
OPTIONS

40
-------

41
-i::

42
--input=<file>::

43
        Input file name. (default: perf.data)

44


45
-v::

46
--verbose::

47
        Be more verbose. (show symbol address, etc)

48


49
-D::

50
--dump-raw-trace=::

51
        Display verbose dump of the sched data.

52


53
SEE ALSO

54
--------

55
linkperf:perf-record[1]

56


57