linux-kernel - Re: [PATCH] perf trace: Simplify '--summary' output

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 12 Nov 2013 23:38:00 +0200
From:	Pekka Enberg <penberg@....fi>
To:	David Ahern <dsahern@...il.com>, Ingo Molnar <mingo@...nel.org>,
	Pekka Enberg <penberg@...nel.org>
CC:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: [PATCH] perf trace: Simplify '--summary' output

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/