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Fwd: dd (coreutils) 5.97 used power of 10 not 2 for calculating MB

From: Dat Head
Subject: Fwd: dd (coreutils) 5.97 used power of 10 not 2 for calculating MB
Date: Tue, 23 Jan 2007 16:15:54 -0500

i'm not saying any of this needs to happen, just something that i noticed.

instead of another flag it might be easiest to just make the stderr message
match whatever was specified in the bs= option (e.g. if you use M then
use ^2 in stderr, if you use MB then use ^10)  of course what to do
when ibs= specifies one way and obs= specifies another is a whole
'nother story!

earlier somebody mentioned MiB usually stands for ^2  is that right!?,
i always thought that the "i" between the MB was from million (as
opposed to mega)

On 1/23/07, Paul Eggert <address@hidden> wrote:
Pádraig Brady <address@hidden> writes:

> There is support for binary multiples in dd,

Yes, but that's for the operands of dd, e.g., "dd bs=512M" talks about
a block size 512 * 1024 * 1024 bytes, as opposed to "dd bs=512MB"
which uses 512 * 1000 * 1000.  But Dat Head is asking for binary
multiples in the stderr messages, e.g.,

   $ dd bs=512M count=1024 if=/dev/zero of=/dev/null
   1024+0 records in
   1024+0 records out
   549755813888 bytes (550 GB) copied, 13.7008 s, 40.1 GB/s

Currently these messages always use powers of 10, not 2, even if the
block size and counts are powers of 2.  Dat Head wants that last line
to say "(512 GiB)" and "37.4 GiB/s".  That will require a new option,
I think.

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