GNU bug report logs - #12489
inconsistent output from 'dd' w/rt stats and suppression.

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Linda Walsh <coreutils <at> tlinx.org>
Subject: bug#12489: closed (Re: bug#12489: inconsistent output from 'dd'
 w/rt stats and suppression.)
Date: Mon, 24 Sep 2012 02:50:04 +0000

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Your bug report

#12489: inconsistent output from 'dd' w/rt stats and suppression.

which was filed against the coreutils package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 12489 <at> debbugs.gnu.org.

-- 
12489: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=12489
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Pádraig Brady <P <at> draigBrady.com>
To: pozsy <at> uhulinux.hu
Cc: 12489-done <at> debbugs.gnu.org, Linda Walsh <coreutils <at> tlinx.org>
Subject: Re: bug#12489: inconsistent output from 'dd' w/rt stats and
	suppression.
Date: Mon, 24 Sep 2012 03:47:25 +0100

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On 09/23/2012 12:12 PM, Pádraig Brady wrote:
> I think there was general consensus that the status=noinfo should be applied
> http://lists.gnu.org/archive/html/bug-coreutils/2010-02/msg00159.html
>
> I'll look at that this evening.

I changed things a bit in the attached patch.
I used 'status=none' rather than 'status=noinfo',
to make it obvious all stderr messages were being suppressed.
Also, I kept the bitmask nature of the existing code
to make it more consistent and extendible.

cheers,
Pádraig.

[dd-status-none.diff (text/plain, attachment)]

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From: Linda Walsh <coreutils <at> tlinx.org>
To: bug-coreutils <at> gnu.org
Subject: inconsistent output from 'dd' w/rt stats and suppression.
Date: Sat, 22 Sep 2012 12:09:55 -0700

If I have 'dd' running, and want to see stats, the manpage says I can 
send it
a USR1 signal and it will print "I/O statistics to standard error and 
then resume copying".  I see something like:
          18335302+0  records  in  18335302+0 records out 9387674624 bytes
             (9.4 GB) copied, 34.6279 seconds, 271 MB/s

The same I/O statistics are displayed at the end of a 'dd' session:

18335302+0 records  in
18335302+0 records out
9387674624 bytes (9.4 GB) copied, 34.6279 seconds, 271 MB/s

The man page says I can use the
"status=noxfer" to suppress transfer statistics".

But when I use it the number of records transfered into 'dd'
and out of 'dd' are still displayed.  Suppressed is the
sum of the bytes transferred in and out, and the time+rate.

So... it seems status=noxfer isn't fully suppressing the statistics
but more accurately only suppresses the summary, time and rate
stats and not the # records transfered in and out.

Either way... shouldn't it just suppress the whole message,
or what's the point?  What switch would one use to suppress
all I/O statistics?

Thanks,
Linda

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