2009-12-15 06:09:31 +08:00
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perf-diff(1)
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2010-05-05 22:23:27 +08:00
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============
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2009-12-15 06:09:31 +08:00
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NAME
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----
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2012-10-24 20:56:51 +08:00
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perf-diff - Read perf.data files and display the differential profile
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2009-12-15 06:09:31 +08:00
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SYNOPSIS
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--------
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[verse]
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2012-10-24 20:56:51 +08:00
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'perf diff' [baseline file] [data file1] [[data file2] ... ]
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2009-12-15 06:09:31 +08:00
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DESCRIPTION
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-----------
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2012-10-24 20:56:51 +08:00
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This command displays the performance difference amongst two or more perf.data
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files captured via perf record.
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2009-12-15 06:09:31 +08:00
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If no parameters are passed it will assume perf.data.old and perf.data.
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2012-09-06 23:46:55 +08:00
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The differential profile is displayed only for events matching both
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specified perf.data files.
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2009-12-15 06:09:31 +08:00
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OPTIONS
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-------
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2010-12-01 09:57:12 +08:00
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-D::
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--dump-raw-trace::
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Dump raw trace in ASCII.
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-m::
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--modules::
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Load module symbols. WARNING: use only with -k and LIVE kernel
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perf diff: Use perf_session__fprintf_hists just like 'perf record'
That means that almost everything you can do with 'perf report'
can be done with 'perf diff', for instance:
$ perf record -f find / > /dev/null
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.062 MB perf.data (~2699
samples) ] $ perf record -f find / > /dev/null
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.062 MB perf.data (~2687
samples) ] perf diff | head -8
9.02% +1.00% find libc-2.10.1.so [.] _IO_vfprintf_internal
2.91% -1.00% find [kernel] [k] __kmalloc
2.85% -1.00% find [kernel] [k] ext4_htree_store_dirent
1.99% -1.00% find [kernel] [k] _atomic_dec_and_lock
2.44% find [kernel] [k] half_md4_transform
$
So if you want to zoom into libc:
$ perf diff --dsos libc-2.10.1.so | head -8
37.34% find [.] _IO_vfprintf_internal
10.34% find [.] __GI_memmove
8.25% +2.00% find [.] _int_malloc
5.07% -1.00% find [.] __GI_mempcpy
7.62% +2.00% find [.] _int_free
$
And if there were multiple commands using libc, it is also
possible to aggregate them all by using --sort symbol:
$ perf diff --dsos libc-2.10.1.so --sort symbol | head -8
37.34% [.] _IO_vfprintf_internal
10.34% [.] __GI_memmove
8.25% +2.00% [.] _int_malloc
5.07% -1.00% [.] __GI_mempcpy
7.62% +2.00% [.] _int_free
$
The displacement column now is off by default, to use it:
perf diff -m --dsos libc-2.10.1.so --sort symbol | head -8
37.34% [.] _IO_vfprintf_internal
10.34% [.] __GI_memmove
8.25% +2.00% [.] _int_malloc
5.07% -1.00% +2 [.] __GI_mempcpy
7.62% +2.00% -1 [.] _int_free
$
Using -t/--field-separator can be used for scripting:
$ perf diff -t, -m --dsos libc-2.10.1.so --sort symbol | head -8
37.34, , ,[.] _IO_vfprintf_internal
10.34, , ,[.] __GI_memmove
8.25,+2.00%, ,[.] _int_malloc
5.07,-1.00%, +2,[.] __GI_mempcpy
7.62,+2.00%, -1,[.] _int_free
6.99,+1.00%, -1,[.] _IO_new_file_xsputn
1.89,-2.00%, +4,[.] __readdir64
$
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1260978567-550-1-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-12-16 23:49:27 +08:00
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-d::
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--dsos=::
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Only consider symbols in these dsos. CSV that understands
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2014-02-07 11:06:07 +08:00
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file://filename entries. This option will affect the percentage
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of the Baseline/Delta column. See --percentage for more info.
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perf diff: Use perf_session__fprintf_hists just like 'perf record'
That means that almost everything you can do with 'perf report'
can be done with 'perf diff', for instance:
$ perf record -f find / > /dev/null
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.062 MB perf.data (~2699
samples) ] $ perf record -f find / > /dev/null
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.062 MB perf.data (~2687
samples) ] perf diff | head -8
9.02% +1.00% find libc-2.10.1.so [.] _IO_vfprintf_internal
2.91% -1.00% find [kernel] [k] __kmalloc
2.85% -1.00% find [kernel] [k] ext4_htree_store_dirent
1.99% -1.00% find [kernel] [k] _atomic_dec_and_lock
2.44% find [kernel] [k] half_md4_transform
$
So if you want to zoom into libc:
$ perf diff --dsos libc-2.10.1.so | head -8
37.34% find [.] _IO_vfprintf_internal
10.34% find [.] __GI_memmove
8.25% +2.00% find [.] _int_malloc
5.07% -1.00% find [.] __GI_mempcpy
7.62% +2.00% find [.] _int_free
$
And if there were multiple commands using libc, it is also
possible to aggregate them all by using --sort symbol:
$ perf diff --dsos libc-2.10.1.so --sort symbol | head -8
37.34% [.] _IO_vfprintf_internal
10.34% [.] __GI_memmove
8.25% +2.00% [.] _int_malloc
5.07% -1.00% [.] __GI_mempcpy
7.62% +2.00% [.] _int_free
$
The displacement column now is off by default, to use it:
perf diff -m --dsos libc-2.10.1.so --sort symbol | head -8
37.34% [.] _IO_vfprintf_internal
10.34% [.] __GI_memmove
8.25% +2.00% [.] _int_malloc
5.07% -1.00% +2 [.] __GI_mempcpy
7.62% +2.00% -1 [.] _int_free
$
Using -t/--field-separator can be used for scripting:
$ perf diff -t, -m --dsos libc-2.10.1.so --sort symbol | head -8
37.34, , ,[.] _IO_vfprintf_internal
10.34, , ,[.] __GI_memmove
8.25,+2.00%, ,[.] _int_malloc
5.07,-1.00%, +2,[.] __GI_mempcpy
7.62,+2.00%, -1,[.] _int_free
6.99,+1.00%, -1,[.] _IO_new_file_xsputn
1.89,-2.00%, +4,[.] __readdir64
$
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1260978567-550-1-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-12-16 23:49:27 +08:00
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-C::
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--comms=::
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Only consider symbols in these comms. CSV that understands
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2014-02-07 11:06:07 +08:00
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file://filename entries. This option will affect the percentage
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of the Baseline/Delta column. See --percentage for more info.
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perf diff: Use perf_session__fprintf_hists just like 'perf record'
That means that almost everything you can do with 'perf report'
can be done with 'perf diff', for instance:
$ perf record -f find / > /dev/null
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.062 MB perf.data (~2699
samples) ] $ perf record -f find / > /dev/null
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.062 MB perf.data (~2687
samples) ] perf diff | head -8
9.02% +1.00% find libc-2.10.1.so [.] _IO_vfprintf_internal
2.91% -1.00% find [kernel] [k] __kmalloc
2.85% -1.00% find [kernel] [k] ext4_htree_store_dirent
1.99% -1.00% find [kernel] [k] _atomic_dec_and_lock
2.44% find [kernel] [k] half_md4_transform
$
So if you want to zoom into libc:
$ perf diff --dsos libc-2.10.1.so | head -8
37.34% find [.] _IO_vfprintf_internal
10.34% find [.] __GI_memmove
8.25% +2.00% find [.] _int_malloc
5.07% -1.00% find [.] __GI_mempcpy
7.62% +2.00% find [.] _int_free
$
And if there were multiple commands using libc, it is also
possible to aggregate them all by using --sort symbol:
$ perf diff --dsos libc-2.10.1.so --sort symbol | head -8
37.34% [.] _IO_vfprintf_internal
10.34% [.] __GI_memmove
8.25% +2.00% [.] _int_malloc
5.07% -1.00% [.] __GI_mempcpy
7.62% +2.00% [.] _int_free
$
The displacement column now is off by default, to use it:
perf diff -m --dsos libc-2.10.1.so --sort symbol | head -8
37.34% [.] _IO_vfprintf_internal
10.34% [.] __GI_memmove
8.25% +2.00% [.] _int_malloc
5.07% -1.00% +2 [.] __GI_mempcpy
7.62% +2.00% -1 [.] _int_free
$
Using -t/--field-separator can be used for scripting:
$ perf diff -t, -m --dsos libc-2.10.1.so --sort symbol | head -8
37.34, , ,[.] _IO_vfprintf_internal
10.34, , ,[.] __GI_memmove
8.25,+2.00%, ,[.] _int_malloc
5.07,-1.00%, +2,[.] __GI_mempcpy
7.62,+2.00%, -1,[.] _int_free
6.99,+1.00%, -1,[.] _IO_new_file_xsputn
1.89,-2.00%, +4,[.] __readdir64
$
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1260978567-550-1-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-12-16 23:49:27 +08:00
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-S::
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--symbols=::
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Only consider these symbols. CSV that understands
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2014-02-07 11:06:07 +08:00
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file://filename entries. This option will affect the percentage
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of the Baseline/Delta column. See --percentage for more info.
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perf diff: Use perf_session__fprintf_hists just like 'perf record'
That means that almost everything you can do with 'perf report'
can be done with 'perf diff', for instance:
$ perf record -f find / > /dev/null
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.062 MB perf.data (~2699
samples) ] $ perf record -f find / > /dev/null
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.062 MB perf.data (~2687
samples) ] perf diff | head -8
9.02% +1.00% find libc-2.10.1.so [.] _IO_vfprintf_internal
2.91% -1.00% find [kernel] [k] __kmalloc
2.85% -1.00% find [kernel] [k] ext4_htree_store_dirent
1.99% -1.00% find [kernel] [k] _atomic_dec_and_lock
2.44% find [kernel] [k] half_md4_transform
$
So if you want to zoom into libc:
$ perf diff --dsos libc-2.10.1.so | head -8
37.34% find [.] _IO_vfprintf_internal
10.34% find [.] __GI_memmove
8.25% +2.00% find [.] _int_malloc
5.07% -1.00% find [.] __GI_mempcpy
7.62% +2.00% find [.] _int_free
$
And if there were multiple commands using libc, it is also
possible to aggregate them all by using --sort symbol:
$ perf diff --dsos libc-2.10.1.so --sort symbol | head -8
37.34% [.] _IO_vfprintf_internal
10.34% [.] __GI_memmove
8.25% +2.00% [.] _int_malloc
5.07% -1.00% [.] __GI_mempcpy
7.62% +2.00% [.] _int_free
$
The displacement column now is off by default, to use it:
perf diff -m --dsos libc-2.10.1.so --sort symbol | head -8
37.34% [.] _IO_vfprintf_internal
10.34% [.] __GI_memmove
8.25% +2.00% [.] _int_malloc
5.07% -1.00% +2 [.] __GI_mempcpy
7.62% +2.00% -1 [.] _int_free
$
Using -t/--field-separator can be used for scripting:
$ perf diff -t, -m --dsos libc-2.10.1.so --sort symbol | head -8
37.34, , ,[.] _IO_vfprintf_internal
10.34, , ,[.] __GI_memmove
8.25,+2.00%, ,[.] _int_malloc
5.07,-1.00%, +2,[.] __GI_mempcpy
7.62,+2.00%, -1,[.] _int_free
6.99,+1.00%, -1,[.] _IO_new_file_xsputn
1.89,-2.00%, +4,[.] __readdir64
$
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1260978567-550-1-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-12-16 23:49:27 +08:00
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-s::
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--sort=::
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2014-03-04 08:06:42 +08:00
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Sort by key(s): pid, comm, dso, symbol, cpu, parent, srcline.
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Please see description of --sort in the perf-report man page.
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perf diff: Use perf_session__fprintf_hists just like 'perf record'
That means that almost everything you can do with 'perf report'
can be done with 'perf diff', for instance:
$ perf record -f find / > /dev/null
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.062 MB perf.data (~2699
samples) ] $ perf record -f find / > /dev/null
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.062 MB perf.data (~2687
samples) ] perf diff | head -8
9.02% +1.00% find libc-2.10.1.so [.] _IO_vfprintf_internal
2.91% -1.00% find [kernel] [k] __kmalloc
2.85% -1.00% find [kernel] [k] ext4_htree_store_dirent
1.99% -1.00% find [kernel] [k] _atomic_dec_and_lock
2.44% find [kernel] [k] half_md4_transform
$
So if you want to zoom into libc:
$ perf diff --dsos libc-2.10.1.so | head -8
37.34% find [.] _IO_vfprintf_internal
10.34% find [.] __GI_memmove
8.25% +2.00% find [.] _int_malloc
5.07% -1.00% find [.] __GI_mempcpy
7.62% +2.00% find [.] _int_free
$
And if there were multiple commands using libc, it is also
possible to aggregate them all by using --sort symbol:
$ perf diff --dsos libc-2.10.1.so --sort symbol | head -8
37.34% [.] _IO_vfprintf_internal
10.34% [.] __GI_memmove
8.25% +2.00% [.] _int_malloc
5.07% -1.00% [.] __GI_mempcpy
7.62% +2.00% [.] _int_free
$
The displacement column now is off by default, to use it:
perf diff -m --dsos libc-2.10.1.so --sort symbol | head -8
37.34% [.] _IO_vfprintf_internal
10.34% [.] __GI_memmove
8.25% +2.00% [.] _int_malloc
5.07% -1.00% +2 [.] __GI_mempcpy
7.62% +2.00% -1 [.] _int_free
$
Using -t/--field-separator can be used for scripting:
$ perf diff -t, -m --dsos libc-2.10.1.so --sort symbol | head -8
37.34, , ,[.] _IO_vfprintf_internal
10.34, , ,[.] __GI_memmove
8.25,+2.00%, ,[.] _int_malloc
5.07,-1.00%, +2,[.] __GI_mempcpy
7.62,+2.00%, -1,[.] _int_free
6.99,+1.00%, -1,[.] _IO_new_file_xsputn
1.89,-2.00%, +4,[.] __readdir64
$
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1260978567-550-1-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-12-16 23:49:27 +08:00
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-t::
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--field-separator=::
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Use a special separator character and don't pad with spaces, replacing
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2010-12-01 09:57:12 +08:00
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all occurrences of this separator in symbol names (and other output)
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perf diff: Use perf_session__fprintf_hists just like 'perf record'
That means that almost everything you can do with 'perf report'
can be done with 'perf diff', for instance:
$ perf record -f find / > /dev/null
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.062 MB perf.data (~2699
samples) ] $ perf record -f find / > /dev/null
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.062 MB perf.data (~2687
samples) ] perf diff | head -8
9.02% +1.00% find libc-2.10.1.so [.] _IO_vfprintf_internal
2.91% -1.00% find [kernel] [k] __kmalloc
2.85% -1.00% find [kernel] [k] ext4_htree_store_dirent
1.99% -1.00% find [kernel] [k] _atomic_dec_and_lock
2.44% find [kernel] [k] half_md4_transform
$
So if you want to zoom into libc:
$ perf diff --dsos libc-2.10.1.so | head -8
37.34% find [.] _IO_vfprintf_internal
10.34% find [.] __GI_memmove
8.25% +2.00% find [.] _int_malloc
5.07% -1.00% find [.] __GI_mempcpy
7.62% +2.00% find [.] _int_free
$
And if there were multiple commands using libc, it is also
possible to aggregate them all by using --sort symbol:
$ perf diff --dsos libc-2.10.1.so --sort symbol | head -8
37.34% [.] _IO_vfprintf_internal
10.34% [.] __GI_memmove
8.25% +2.00% [.] _int_malloc
5.07% -1.00% [.] __GI_mempcpy
7.62% +2.00% [.] _int_free
$
The displacement column now is off by default, to use it:
perf diff -m --dsos libc-2.10.1.so --sort symbol | head -8
37.34% [.] _IO_vfprintf_internal
10.34% [.] __GI_memmove
8.25% +2.00% [.] _int_malloc
5.07% -1.00% +2 [.] __GI_mempcpy
7.62% +2.00% -1 [.] _int_free
$
Using -t/--field-separator can be used for scripting:
$ perf diff -t, -m --dsos libc-2.10.1.so --sort symbol | head -8
37.34, , ,[.] _IO_vfprintf_internal
10.34, , ,[.] __GI_memmove
8.25,+2.00%, ,[.] _int_malloc
5.07,-1.00%, +2,[.] __GI_mempcpy
7.62,+2.00%, -1,[.] _int_free
6.99,+1.00%, -1,[.] _IO_new_file_xsputn
1.89,-2.00%, +4,[.] __readdir64
$
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1260978567-550-1-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-12-16 23:49:27 +08:00
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with a '.' character, that thus it's the only non valid separator.
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2009-12-15 06:09:31 +08:00
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-v::
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--verbose::
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2009-12-15 17:24:08 +08:00
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Be verbose, for instance, show the raw counts in addition to the
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2009-12-15 06:09:31 +08:00
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diff.
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2009-12-15 21:01:22 +08:00
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2010-12-01 09:57:12 +08:00
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-f::
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--force::
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Don't complain, do it.
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2010-12-10 04:27:07 +08:00
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--symfs=<directory>::
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Look for files with symbols relative to this directory.
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2010-12-01 09:57:12 +08:00
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2012-10-05 22:44:40 +08:00
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-b::
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--baseline-only::
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Show only items with match in baseline.
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2012-10-05 22:44:41 +08:00
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-c::
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--compute::
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2012-10-05 22:44:43 +08:00
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Differential computation selection - delta,ratio,wdiff (default is delta).
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2012-10-05 22:44:41 +08:00
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See COMPARISON METHODS section for more info.
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2012-10-05 22:44:44 +08:00
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-p::
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--period::
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Show period values for both compared hist entries.
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2012-10-05 22:44:45 +08:00
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-F::
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--formula::
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Show formula for given computation.
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2012-11-26 06:10:20 +08:00
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-o::
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--order::
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Specify compute sorting column number.
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2014-02-07 11:06:07 +08:00
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--percentage::
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Determine how to display the overhead percentage of filtered entries.
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Filters can be applied by --comms, --dsos and/or --symbols options.
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"relative" means it's relative to filtered entries only so that the
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sum of shown entries will be always 100%. "absolute" means it retains
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the original value before and after the filter is applied.
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2012-10-24 20:56:51 +08:00
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COMPARISON
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----------
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The comparison is governed by the baseline file. The baseline perf.data
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file is iterated for samples. All other perf.data files specified on
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the command line are searched for the baseline sample pair. If the pair
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is found, specified computation is made and result is displayed.
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All samples from non-baseline perf.data files, that do not match any
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baseline entry, are displayed with empty space within baseline column
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and possible computation results (delta) in their related column.
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Example files samples:
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- file A with samples f1, f2, f3, f4, f6
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- file B with samples f2, f4, f5
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- file C with samples f1, f2, f5
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Example output:
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x - computation takes place for pair
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b - baseline sample percentage
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- perf diff A B C
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baseline/A compute/B compute/C samples
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---------------------------------------
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b x f1
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b x x f2
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b f3
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b x f4
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b f6
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x x f5
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- perf diff B A C
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baseline/B compute/A compute/C samples
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---------------------------------------
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b x x f2
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b x f4
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b x f5
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x x f1
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x f3
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x f6
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- perf diff C B A
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|
baseline/C compute/B compute/A samples
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---------------------------------------
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b x f1
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b x x f2
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b x f5
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x f3
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x x f4
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x f6
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|
2012-10-05 22:44:41 +08:00
|
|
|
COMPARISON METHODS
|
|
|
|
|
------------------
|
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|
delta
|
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|
|
~~~~~
|
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|
|
If specified the 'Delta' column is displayed with value 'd' computed as:
|
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|
d = A->period_percent - B->period_percent
|
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|
|
with:
|
2012-10-24 20:56:51 +08:00
|
|
|
- A/B being matching hist entry from data/baseline file specified
|
2012-10-05 22:44:41 +08:00
|
|
|
(or perf.data/perf.data.old) respectively.
|
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|
|
- period_percent being the % of the hist entry period value within
|
|
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|
|
single data file
|
|
|
|
|
|
2014-02-07 11:06:07 +08:00
|
|
|
- with filtering by -C, -d and/or -S, period_percent might be changed
|
|
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|
|
relative to how entries are filtered. Use --percentage=absolute to
|
|
|
|
|
prevent such fluctuation.
|
|
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|
|
2012-10-05 22:44:41 +08:00
|
|
|
ratio
|
|
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|
|
~~~~~
|
|
|
|
|
If specified the 'Ratio' column is displayed with value 'r' computed as:
|
|
|
|
|
|
|
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|
|
r = A->period / B->period
|
|
|
|
|
|
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|
|
|
with:
|
2012-10-24 20:56:51 +08:00
|
|
|
- A/B being matching hist entry from data/baseline file specified
|
2012-10-05 22:44:41 +08:00
|
|
|
(or perf.data/perf.data.old) respectively.
|
|
|
|
|
|
|
|
|
|
- period being the hist entry period value
|
|
|
|
|
|
2012-10-24 20:56:51 +08:00
|
|
|
wdiff:WEIGHT-B,WEIGHT-A
|
|
|
|
|
~~~~~~~~~~~~~~~~~~~~~~~
|
2012-10-05 22:44:43 +08:00
|
|
|
If specified the 'Weighted diff' column is displayed with value 'd' computed as:
|
|
|
|
|
|
|
|
|
|
d = B->period * WEIGHT-A - A->period * WEIGHT-B
|
|
|
|
|
|
2012-10-24 20:56:51 +08:00
|
|
|
- A/B being matching hist entry from data/baseline file specified
|
2012-10-05 22:44:43 +08:00
|
|
|
(or perf.data/perf.data.old) respectively.
|
|
|
|
|
|
|
|
|
|
- period being the hist entry period value
|
|
|
|
|
|
2014-09-09 23:18:50 +08:00
|
|
|
- WEIGHT-A/WEIGHT-B being user supplied weights in the the '-c' option
|
2012-10-05 22:44:43 +08:00
|
|
|
behind ':' separator like '-c wdiff:1,2'.
|
2014-09-09 23:18:50 +08:00
|
|
|
- WEIGHT-A being the weight of the data file
|
|
|
|
|
- WEIGHT-B being the weight of the baseline data file
|
2012-10-05 22:44:41 +08:00
|
|
|
|
2009-12-15 06:09:31 +08:00
|
|
|
SEE ALSO
|
|
|
|
|
--------
|
2014-03-04 08:06:42 +08:00
|
|
|
linkperf:perf-record[1], linkperf:perf-report[1]
|
