Date: Mon, 27 Sep 2004 20:25:40 -0700 From: Kris Kennaway <kris@obsecurity.org> To: "Kevin D. Kinsey, DaleCo, S.P." <kdk@daleco.biz> Cc: Kris Kennaway <kris@obsecurity.org> Subject: Re: Very very slow Message-ID: <20040928032540.GA62632@xor.obsecurity.org> In-Reply-To: <4158AD01.401@daleco.biz> References: <2D8BB15C7B5C214F81C32D3A83B32736013D46C8@idbexc01.americas.cpqcorp.net> <20040927081638.GA26247@math.jussieu.fr> <20040927184827.GB31494@xor.obsecurity.org> <4158AD01.401@daleco.biz>
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On Mon, Sep 27, 2004 at 07:14:57PM -0500, Kevin D. Kinsey, DaleCo, S.P. wro=
te:
> Kris Kennaway wrote:
>=20
> >On Mon, Sep 27, 2004 at 10:16:38AM +0200, Albert Shih wrote:
> >=20
> >
> >> 32 sec to do
> >>
> >>cd /usr/src
> >>time find . -type f -print > /dev/null
> >>
> >>and on other computer I just need 0.8 sec to do that.
> >> =20
> >>
> >
> >I don't believe that, unless you already have all of /usr/src in
> >cache. 32 seconds seems quite normal for searching and reading ~55000
> >directory entries (on the machine I just tried it took 42 seconds).
> >
> >Kris
> >=20
> >
>=20
> Hmm. Didn't take that long here.=20
>=20
> Celeron 2.4, 768MB DDR, full src
> (enough to buildworld on 5.2.1-p3, anyway):
>=20
> <kadmin@archangel> [/usr/src] [19:10]
> % sudo time find . -type f -print > /dev/null
>=20
> 3.60 real 0.34 user 1.86 sys
I can only reproduce those kind of numbers when everything is already
cached:
> /usr/bin/time find /usr/src/ -type f -print > /dev/null
45.28 real 0.30 user 1.51 sys
> /usr/bin/time find /usr/src/ -type f -print > /dev/null
1.34 real 0.26 user 1.07 sys
If your system is quiet, /usr/src may still be cached from the last
nightly run of locate.updatedb.
Try running the test from single-user mode after the system has just
been rebooted.
Kris
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