From: viro@parcelfarce.linux.theplanet.co.uk
To: "David S. Miller" <davem@redhat.com>
Cc: Chris Wedgwood <cw@f00f.org>,
peter@chubb.wattle.id.au, linux-kernel@vger.kernel.org
Subject: Re: stat very inefficient
Date: Thu, 29 Jul 2004 01:29:24 +0100 [thread overview]
Message-ID: <20040729002924.GK12308@parcelfarce.linux.theplanet.co.uk> (raw)
In-Reply-To: <20040728171414.5de8da96.davem@redhat.com>
On Wed, Jul 28, 2004 at 05:14:14PM -0700, David S. Miller wrote:
> On Wed, 28 Jul 2004 17:08:37 -0700
> Chris Wedgwood <cw@f00f.org> wrote:
>
> > Just How bad is it for you? I just tested stat on my crapbox and for
> > a short path 1M stats takes 0.5s and for a longer path (30 bytes or
> > so) 2.8s.
>
> Run "time find . -type f" on the kernel tree, both before and
> after removing the third unnecessary copy.
... with hot cache, otherwise IO time will dominate. I don't disagree
with you, but in all realistic cases I can think of it's going to be
noise (e.g. this find over kernel tree is almost certainly followed
by xargs grep, etc.).
next prev parent reply other threads:[~2004-07-29 0:33 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <233602095@toto.iv>
2004-07-28 22:33 ` Peter Chubb
2004-07-28 22:45 ` David S. Miller
2004-07-29 0:08 ` Chris Wedgwood
2004-07-29 0:14 ` David S. Miller
2004-07-29 0:24 ` Chris Wedgwood
2004-07-29 0:29 ` viro [this message]
2004-07-29 7:26 ` Peter Chubb
2004-07-29 7:42 ` Andrew Morton
2004-07-29 8:49 ` Paul Jackson
2004-07-29 9:02 ` Andrew Morton
2004-07-29 9:17 ` Peter Chubb
2004-07-29 7:45 ` Ulrich Drepper
2004-07-29 11:42 ` Nigel Rantor
2004-07-29 1:07 ` Ulrich Drepper
2004-07-29 2:22 ` Paul Jackson
2004-07-29 4:10 ` Ulrich Drepper
2004-07-29 6:18 ` Paul Jackson
[not found] <2mN94-3MP-9@gated-at.bofh.it>
2004-07-28 10:16 ` Andi Kleen
2004-07-28 15:38 ` David S. Miller
2004-07-28 3:13 David S. Miller
2004-07-28 18:07 ` viro
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