From: Pekka Enberg <penberg@iki.fi>
To: David Ahern <dsahern@gmail.com>, Ingo Molnar <mingo@kernel.org>,
Pekka Enberg <penberg@kernel.org>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Subject: Re: [PATCH] perf trace: Simplify '--summary' output
Date: Tue, 12 Nov 2013 23:38:00 +0200 [thread overview]
Message-ID: <52829FB8.6070404@iki.fi> (raw)
In-Reply-To: <52829F4F.6070800@gmail.com>
On 11/12/13 11:36 PM, David Ahern wrote:
> On 11/12/13, 2:33 PM, Ingo Molnar wrote:
>>> > Summary of events:
>>> >
>>> > dbus-daemon (555), 10 events, 0.0%, 0.000 msec
>>> >
>>> > msec/call
>>> > syscall calls min avg max stddev
>>> > --------------- -------- -------- -------- -------- ------
>>> > sendmsg 2 0.002 0.005 0.008 55.00
>>> > recvmsg 2 0.002 0.003 0.005 44.00
>>> > epoll_wait 1 0.000 0.000 0.000 0.00
>> In what units is stddev? Percentage? If yes then it might be useful to
>> output it as %. [and probably to restrict precision to a single digit,
>> standard deviations are rarely more accurate than 0.1%.]
>>
>
> %. That was dropped in the recent output change.
Sorry about that. Why do we show them in percentages, btw? Standard
deviation is usually represented in the same unit as the data to make it
readable.
Pekka
next prev parent reply other threads:[~2013-11-12 21:38 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-12 14:42 [PATCH] perf trace: Simplify '--summary' output Pekka Enberg
2013-11-12 21:33 ` Ingo Molnar
2013-11-12 21:36 ` David Ahern
2013-11-12 21:38 ` Pekka Enberg [this message]
2013-11-12 21:42 ` David Ahern
2013-11-12 21:50 ` Ingo Molnar
2013-11-12 21:40 ` Ingo Molnar
2013-11-13 6:57 ` Pekka Enberg
2013-11-13 11:14 ` Ingo Molnar
2013-11-12 21:56 ` [tip:perf/urgent] " tip-bot for Pekka Enberg
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