GNU bug report logs - #8200
cp -lr uses a lot of CPU time.

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Message #16 received at 8200-done <at> debbugs.gnu.org (full text, mbox):

From: Jim Meyering <jim <at> meyering.net>
To: Rogier Wolff <R.E.Wolff <at> BitWizard.nl>
Cc: 8200-done <at> debbugs.gnu.org
Subject: Re: bug#8200: cp -lr uses a lot of CPU time.
Date: Thu, 10 Mar 2011 18:39:34 +0100

Rogier Wolff wrote:
> Aaargh... It seems the bug has been fixed... Feel free to ignore my
> explanation below.

Thanks.  I've marked this ticket as closed.

> On Tue, Mar 08, 2011 at 04:05:04PM +0100, Jim Meyering wrote:
>> For starters, what version of cp did you use?
>> Run cp --version
>
> -> cp (GNU coreutils) 8.5

In v7.0-63-g3ece035, I made this change:

    http://git.sv.gnu.org/cgit/coreutils.git/commit/?id=3ece0355d52e41a1
    cp: use far less memory in some cases

    cp --link was "remembering" many name,dev,inode triples unnecessarily.
    ...

which would make a big difference in your case.

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