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4979d0c7d0
Add 'perf stat record' command support. It creates simple (header only)
perf.data file ATM.
The record command could be specified anywhere among stat options. All
stat command options are valid for stat record command with '-o' option
exception. If specified for record command it denotes the perf data file
name.
Committer note:
Set sample_type to PERF_SAMPLE_IDENTIFIER, which should be harmless
while avoiding that older tools show confusing messages, for instance,
with sample_type = 0, we get:
$ perf stat record usleep 1
Performance counter stats for 'usleep 1':
0.630237 task-clock (msec) # 0.528 CPUs utilized
1 context-switches # 0.002 M/sec
0 cpu-migrations # 0.000 K/sec
52 page-faults # 0.083 M/sec
978,312 cycles # 1.552 GHz
671,931 stalled-cycles-frontend # 68.68% frontend cycles idle
<not supported> stalled-cycles-backend
646,379 instructions # 0.66 insns per cycle
# 1.04 stalled cycles per insn
131,046 branches # 207.931 M/sec
7,073 branch-misses # 5.40% of all branches
0.001193240 seconds time elapsed
$ oldperf evlist
WARNING: The perf.data file's data size field is 0 which is unexpected.
Was the 'perf record' command properly terminated?
non matching sample_type
$
While with sample_type set to PERF_SAMPLE_IDENTIFIER, after we re-run 'perf
stat record usleep' we get:
$ oldperf evlist
WARNING: The perf.data file's data size field is 0 which is unexpected.
Was the 'perf record' command properly terminated?
task-clock
context-switches
cpu-migrations
page-faults
cycles
stalled-cycles-frontend
stalled-cycles-backend
instructions
branches
branch-misses
$
Which at least shows the names of the events in the perf.data file.
Additionally, such files, when passed to 'perf report' will produce:
$ oldperf report --stdio
WARNING: The perf.data file's data size field is 0 which is unexpected.
Was the 'perf record' command properly terminated?
Warning:
Kernel address maps (/proc/{kallsyms,modules}) were restricted.
Check /proc/sys/kernel/kptr_restrict before running 'perf record'.
As no suitable kallsyms nor vmlinux was found, kernel samples
can't be resolved.
Samples in kernel modules can't be resolved as well.
Error:
The perf.data file has no samples!
# To display the perf.data header info, please use --header/--header-only options.
#
$
Which is confusing and can be solved by just adding the kernel mmap record,
which will also remove that warning about the data size field being equal to
zero, after generating the mmap record:
$ perf stat record usleep 1
Performance counter stats for 'usleep 1':
0.600796 task-clock (msec) # 0.478 CPUs utilized
1 context-switches # 0.002 M/sec
0 cpu-migrations # 0.000 K/sec
54 page-faults # 0.090 M/sec
886,844 cycles # 1.476 GHz
582,169 stalled-cycles-frontend # 65.65% frontend cycles idle
<not supported> stalled-cycles-backend
638,344 instructions # 0.72 insns per cycle
# 0.91 stalled cycles per insn
130,204 branches # 216.719 M/sec
7,500 branch-misses # 5.76% of all branches
0.001255897 seconds time elapsed
$ oldperf evlist
task-clock
context-switches
cpu-migrations
page-faults
cycles
stalled-cycles-frontend
stalled-cycles-backend
instructions
branches
branch-misses
$ oldperf report --stdio
Error:
The perf.data file has no samples!
# To display the perf.data header info, please use --header/--header-only options.
#
[acme@zoo linux]$
No warnings, sensible output about what are the events in the perf.data file and also
a "file has no samples" message, which indeed it doesn't.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: Kan Liang <kan.liang@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: htp://lkml.kernel.org/r/1446734469-11352-3-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
195 lines
5.8 KiB
Plaintext
195 lines
5.8 KiB
Plaintext
perf-stat(1)
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============
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NAME
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----
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perf-stat - Run a command and gather performance counter statistics
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SYNOPSIS
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--------
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[verse]
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'perf stat' [-e <EVENT> | --event=EVENT] [-a] <command>
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'perf stat' [-e <EVENT> | --event=EVENT] [-a] -- <command> [<options>]
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'perf stat' [-e <EVENT> | --event=EVENT] [-a] record [-o file] -- <command> [<options>]
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DESCRIPTION
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-----------
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This command runs a command and gathers performance counter statistics
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from it.
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OPTIONS
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-------
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<command>...::
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Any command you can specify in a shell.
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record::
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See STAT RECORD.
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-e::
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--event=::
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Select the PMU event. Selection can be:
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- a symbolic event name (use 'perf list' to list all events)
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- a raw PMU event (eventsel+umask) in the form of rNNN where NNN is a
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hexadecimal event descriptor.
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- a symbolically formed event like 'pmu/param1=0x3,param2/' where
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param1 and param2 are defined as formats for the PMU in
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/sys/bus/event_sources/devices/<pmu>/format/*
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- a symbolically formed event like 'pmu/config=M,config1=N,config2=K/'
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where M, N, K are numbers (in decimal, hex, octal format).
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Acceptable values for each of 'config', 'config1' and 'config2'
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parameters are defined by corresponding entries in
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/sys/bus/event_sources/devices/<pmu>/format/*
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-i::
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--no-inherit::
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child tasks do not inherit counters
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-p::
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--pid=<pid>::
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stat events on existing process id (comma separated list)
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-t::
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--tid=<tid>::
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stat events on existing thread id (comma separated list)
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-a::
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--all-cpus::
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system-wide collection from all CPUs
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-c::
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--scale::
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scale/normalize counter values
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-r::
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--repeat=<n>::
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repeat command and print average + stddev (max: 100). 0 means forever.
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-B::
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--big-num::
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print large numbers with thousands' separators according to locale
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-C::
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--cpu=::
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Count only on the list of CPUs provided. Multiple CPUs can be provided as a
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comma-separated list with no space: 0,1. Ranges of CPUs are specified with -: 0-2.
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In per-thread mode, this option is ignored. The -a option is still necessary
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to activate system-wide monitoring. Default is to count on all CPUs.
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-A::
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--no-aggr::
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Do not aggregate counts across all monitored CPUs in system-wide mode (-a).
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This option is only valid in system-wide mode.
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-n::
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--null::
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null run - don't start any counters
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-v::
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--verbose::
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be more verbose (show counter open errors, etc)
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-x SEP::
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--field-separator SEP::
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print counts using a CSV-style output to make it easy to import directly into
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spreadsheets. Columns are separated by the string specified in SEP.
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-G name::
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--cgroup name::
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monitor only in the container (cgroup) called "name". This option is available only
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in per-cpu mode. The cgroup filesystem must be mounted. All threads belonging to
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container "name" are monitored when they run on the monitored CPUs. Multiple cgroups
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can be provided. Each cgroup is applied to the corresponding event, i.e., first cgroup
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to first event, second cgroup to second event and so on. It is possible to provide
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an empty cgroup (monitor all the time) using, e.g., -G foo,,bar. Cgroups must have
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corresponding events, i.e., they always refer to events defined earlier on the command
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line.
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-o file::
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--output file::
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Print the output into the designated file.
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--append::
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Append to the output file designated with the -o option. Ignored if -o is not specified.
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--log-fd::
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Log output to fd, instead of stderr. Complementary to --output, and mutually exclusive
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with it. --append may be used here. Examples:
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3>results perf stat --log-fd 3 -- $cmd
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3>>results perf stat --log-fd 3 --append -- $cmd
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--pre::
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--post::
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Pre and post measurement hooks, e.g.:
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perf stat --repeat 10 --null --sync --pre 'make -s O=defconfig-build/clean' -- make -s -j64 O=defconfig-build/ bzImage
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-I msecs::
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--interval-print msecs::
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Print count deltas every N milliseconds (minimum: 10ms)
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The overhead percentage could be high in some cases, for instance with small, sub 100ms intervals. Use with caution.
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example: 'perf stat -I 1000 -e cycles -a sleep 5'
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--per-socket::
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Aggregate counts per processor socket for system-wide mode measurements. This
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is a useful mode to detect imbalance between sockets. To enable this mode,
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use --per-socket in addition to -a. (system-wide). The output includes the
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socket number and the number of online processors on that socket. This is
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useful to gauge the amount of aggregation.
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--per-core::
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Aggregate counts per physical processor for system-wide mode measurements. This
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is a useful mode to detect imbalance between physical cores. To enable this mode,
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use --per-core in addition to -a. (system-wide). The output includes the
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core number and the number of online logical processors on that physical processor.
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--per-thread::
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Aggregate counts per monitored threads, when monitoring threads (-t option)
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or processes (-p option).
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-D msecs::
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--delay msecs::
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After starting the program, wait msecs before measuring. This is useful to
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filter out the startup phase of the program, which is often very different.
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-T::
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--transaction::
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Print statistics of transactional execution if supported.
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STAT RECORD
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-----------
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Stores stat data into perf data file.
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-o file::
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--output file::
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Output file name.
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EXAMPLES
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--------
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$ perf stat -- make -j
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Performance counter stats for 'make -j':
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8117.370256 task clock ticks # 11.281 CPU utilization factor
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678 context switches # 0.000 M/sec
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133 CPU migrations # 0.000 M/sec
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235724 pagefaults # 0.029 M/sec
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24821162526 CPU cycles # 3057.784 M/sec
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18687303457 instructions # 2302.138 M/sec
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172158895 cache references # 21.209 M/sec
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27075259 cache misses # 3.335 M/sec
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Wall-clock time elapsed: 719.554352 msecs
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SEE ALSO
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--------
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linkperf:perf-top[1], linkperf:perf-list[1]
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