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Subject: bug#9191: dd does not use the given block size > 2GB
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Hi Coreutils.
$ ./dd if=/dev/zero of=/dev/null bs=2G
gives the following in 'top':
23182 tange 20 0 2058m 2.0g 616 R 100 25.8 0:25.13 dd
So it actively uses 2 G. This is exactly what I would expect.
However, if I use 10G it mallocs 10 G but only uses 2 G:
$ ./dd if=/dev/zero of=/dev/null bs=10G
Apparently all I need to do is:
./dd iflag=fullblock if=/dev/zero of=/dev/null bs=10G
But for a normal user (indeed for me before I read the source) this
comes as a surprise.
I would like to suggest that if bs is bigger than the used block, then
you get a warning like this:
dd: given bs=10G but used bs=2G. To force using 10G use 'iflag=fullblock'
Also the man page should refer to 'iflag=fullblock' under 'bs' and 'ibs'.
$ ./dd --version
dd (coreutils) 8.12
Copyright (C) 2011 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Written by Paul Rubin, David MacKenzie, and Stuart Kemp.
/Ole
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.427 (Entity 5.427) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Ole Tange <tange@HIDDEN> Subject: bug#9191: Acknowledgement (dd does not use the given block size > 2GB) Message-ID: <handler.9191.B.131188032223560.ack <at> debbugs.gnu.org> References: <CA+4vN7x5GHvyXo1JQk6rCVCy766SdgjCbDGnH7_yVWbgU4+6Sg@HIDDEN> X-Gnu-PR-Message: ack 9191 X-Gnu-PR-Package: coreutils Reply-To: 9191 <at> debbugs.gnu.org Date: Thu, 28 Jul 2011 19:12:06 +0000 Thank you for filing a new bug report with GNU. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-coreutils@HIDDEN If you wish to submit further information on this problem, please send it to 9191 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 9191: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D9191 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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