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Date: Tue, 18 Dec 2007 02:03:55 -0800
From: Alfred Perlstein <alfred@freebsd.org>
To: Diomidis Spinellis <dds@FreeBSD.org>
Message-ID: <20071218100355.GR16982@elvis.mu.org>
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Subject: Re: cvs commit: src/tools/regression/bin/mv regress.sh
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* Diomidis Spinellis <dds@FreeBSD.org> [071218 00:48] wrote:
> dds         2007-12-18 08:49:47 UTC
> 
>   FreeBSD src repository
> 
>   Modified files:
>     tools/regression/bin/mv regress.sh 
>   Log:
>   Add more tests.  All rename(2)-based tests now succeed.
>   The performance of the cross-device equivalents is under investigation.

Diomidis,

Does 'mv' spawn off tar or something to do the copy part?

You can _usually_ get much better cross device performance
by hooking two processes together like so:

tar -cf - -C /path/to/source . | tar -xf - -C /path/to/dst 

This will keep the disks a lot busier, but this can make
things worse on cross device moves that happen to be
on the same disk.

-- 
- Alfred Perlstein