From: Jiri Olsa <jolsa@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: Jiri Olsa <jolsa@redhat.com>,
Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Ingo Molnar <mingo@elte.hu>, Paul Mackerras <paulus@samba.org>,
Corey Ashford <cjashfor@linux.vnet.ibm.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Namhyung Kim <namhyung@kernel.org>
Subject: [PATCH 09/14] perf diff: Update perf diff documentation for multiple data comparison
Date: Wed, 28 Nov 2012 14:52:44 +0100 [thread overview]
Message-ID: <1354110769-2998-10-git-send-email-jolsa@redhat.com> (raw)
In-Reply-To: <1354110769-2998-1-git-send-email-jolsa@redhat.com>
Updating perf diff documentation to include multiple perf data
files comparison.
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
---
tools/perf/Documentation/perf-diff.txt | 73 +++++++++++++++++++++++++++++-----
1 file changed, 64 insertions(+), 9 deletions(-)
diff --git a/tools/perf/Documentation/perf-diff.txt b/tools/perf/Documentation/perf-diff.txt
index 194f37d..ab5b79e 100644
--- a/tools/perf/Documentation/perf-diff.txt
+++ b/tools/perf/Documentation/perf-diff.txt
@@ -3,17 +3,17 @@ perf-diff(1)
NAME
----
-perf-diff - Read two perf.data files and display the differential profile
+perf-diff - Read perf.data files and display the differential profile
SYNOPSIS
--------
[verse]
-'perf diff' [oldfile] [newfile]
+'perf diff' [baseline file] [data file1] [[data file2] ... ]
DESCRIPTION
-----------
-This command displays the performance difference amongst two perf.data files
-captured via perf record.
+This command displays the performance difference amongst two or more perf.data
+files captured via perf record.
If no parameters are passed it will assume perf.data.old and perf.data.
@@ -91,6 +91,59 @@ OPTIONS
--formula::
Show formula for given computation.
+COMPARISON
+----------
+The comparison is governed by the baseline file. The baseline perf.data
+file is iterated for samples. All other perf.data files specified on
+the command line are searched for the baseline sample pair. If the pair
+is found, specified computation is made and result is displayed.
+
+All samples from non-baseline perf.data files, that do not match any
+baseline entry, are displayed with empty space within baseline column
+and possible computation results (delta) in their related column.
+
+Example files samples:
+- file A with samples f1, f2, f3, f4, f6
+- file B with samples f2, f4, f5
+- file C with samples f1, f2, f5
+
+Example output:
+ x - computation takes place for pair
+ b - baseline sample percentage
+
+- perf diff A B C
+
+ baseline/A compute/B compute/C samples
+ ---------------------------------------
+ b x f1
+ b x x f2
+ b f3
+ b x f4
+ b f6
+ x x f5
+
+- perf diff B A C
+
+ baseline/B compute/A compute/C samples
+ ---------------------------------------
+ b x x f2
+ b x f4
+ b x f5
+ x x f1
+ x f3
+ x f6
+
+- perf diff C B A
+
+ baseline/C compute/B compute/A samples
+ ---------------------------------------
+ b x f1
+ b x x f2
+ b x f5
+ x f3
+ x x f4
+ x f6
+
COMPARISON METHODS
------------------
delta
@@ -100,7 +153,7 @@ If specified the 'Delta' column is displayed with value 'd' computed as:
d = A->period_percent - B->period_percent
with:
- - A/B being matching hist entry from first/second file specified
+ - A/B being matching hist entry from data/baseline file specified
(or perf.data/perf.data.old) respectively.
- period_percent being the % of the hist entry period value within
@@ -113,24 +166,26 @@ If specified the 'Ratio' column is displayed with value 'r' computed as:
r = A->period / B->period
with:
- - A/B being matching hist entry from first/second file specified
+ - A/B being matching hist entry from data/baseline file specified
(or perf.data/perf.data.old) respectively.
- period being the hist entry period value
-wdiff
-~~~~~
+wdiff:WEIGHT-B,WEIGHT-A
+~~~~~~~~~~~~~~~~~~~~~~~
If specified the 'Weighted diff' column is displayed with value 'd' computed as:
d = B->period * WEIGHT-A - A->period * WEIGHT-B
- - A/B being matching hist entry from first/second file specified
+ - A/B being matching hist entry from data/baseline file specified
(or perf.data/perf.data.old) respectively.
- period being the hist entry period value
- WEIGHT-A/WEIGHT-B being user suplied weights in the the '-c' option
behind ':' separator like '-c wdiff:1,2'.
+ - WIEGHT-A being the weight of the data file
+ - WIEGHT-B being the weight of the baseline data file
SEE ALSO
--------
--
1.7.11.7
next prev parent reply other threads:[~2012-11-28 13:53 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-28 13:52 [PATCH/RFC 00/14] perf, tool: Fix endian issues Jiri Olsa
2012-11-28 13:52 ` [PATCH 01/14] perf tool: Introduce perf_hpp__list for period related columns Jiri Olsa
2012-11-29 7:44 ` Namhyung Kim
2012-11-29 10:52 ` Namhyung Kim
2012-11-28 13:52 ` [PATCH 02/14] perf tool: Add struct perf_hpp_fmt into hpp callbacks Jiri Olsa
2012-11-28 13:52 ` [PATCH 03/14] perf tool: Fix period symbol_conf.field_sep display Jiri Olsa
2012-11-29 7:56 ` Namhyung Kim
2012-11-29 11:53 ` Jiri Olsa
2012-11-29 13:40 ` [PATCH] perf hists: Fix period symbol_conf.field_sep display, again Jiri Olsa
2012-11-29 17:35 ` Arnaldo Carvalho de Melo
2012-11-28 13:52 ` [PATCH 04/14] perf diff: Remove displacement from struct hist_entry_diff Jiri Olsa
2012-11-29 8:00 ` Namhyung Kim
2013-01-24 18:50 ` [tip:perf/core] " tip-bot for Jiri Olsa
2012-11-28 13:52 ` [PATCH 05/14] perf diff: Change compute methods to work with pair directly Jiri Olsa
2012-11-29 11:15 ` Namhyung Kim
2013-01-24 18:51 ` [tip:perf/core] " tip-bot for Jiri Olsa
2012-11-28 13:52 ` [PATCH 06/14] perf diff: Change formula " Jiri Olsa
2012-11-29 11:15 ` Namhyung Kim
2013-01-24 18:52 ` [tip:perf/core] " tip-bot for Jiri Olsa
2012-11-28 13:52 ` [PATCH 07/14] perf diff: Add callback to hists__match/hists__link functions Jiri Olsa
2012-11-28 13:52 ` [PATCH 08/14] perf diff: Change diff command to work over multiple data files Jiri Olsa
2012-11-29 11:37 ` Namhyung Kim
2012-11-29 11:53 ` Jiri Olsa
2012-11-28 13:52 ` Jiri Olsa [this message]
2012-11-29 11:52 ` [PATCH 09/14] perf diff: Update perf diff documentation for multiple data comparison Namhyung Kim
2012-11-29 12:06 ` Jiri Olsa
2012-11-28 13:52 ` [PATCH 10/14] perf tool: Centralize default columns init in perf_hpp__init Jiri Olsa
2012-11-29 11:55 ` Namhyung Kim
2012-11-29 12:13 ` Jiri Olsa
2012-11-30 5:06 ` Namhyung Kim
2012-11-30 11:56 ` Jiri Olsa
2012-11-28 13:52 ` [PATCH 11/14] perf diff: Making compute functions static Jiri Olsa
2012-11-28 13:52 ` [PATCH 12/14] perf diff: Display data file info ahead of the diff output Jiri Olsa
2012-11-28 13:52 ` [PATCH 13/14] perf diff: Display zero calculation results Jiri Olsa
2012-11-28 13:52 ` [PATCH 14/14] perf diff: Add generic order option for compute sorting Jiri Olsa
2012-11-29 12:02 ` Namhyung Kim
2012-11-29 12:19 ` Jiri Olsa
2012-11-28 13:56 ` [PATCH/RFC 00/14] perf, diff: Support for multiple files Jiri Olsa
2012-11-28 15:57 ` Jiri Olsa
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