Date: Sun, 18 Sep 2011 00:54:13 -0400 From: Jason Hellenthal <jhell@DataIX.net> To: Ronald Klop <ronald-freebsd8@klop.yi.org> Cc: "freebsd-stable@freebsd.org" <freebsd-stable@freebsd.org> Subject: Re: /usr/bin/script eating 100% cpu with portupgrade and xargs Message-ID: <20110918045413.GA63773@DataIX.net> In-Reply-To: <op.v1y8gdtf8527sy@pinky> References: <op.v1y8gdtf8527sy@pinky>
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On Sun, Sep 18, 2011 at 01:49:15AM +0200, Ronald Klop wrote:
> Hi,
>=20
> I'm running portupgrade in screen to update all the ports for =20
> 9-BETA2/9-CURRENT on amd64. While doing this script eats 100% cpu.
> Because portupgrade -fa crashed I'm running this command to update the =
=20
> remaining non-updates ports.
> find /var/db/pkg -name +DESC -mtime +2 |cut -d / -f 5 | xargs time nice -=
n =20
> 20 portupgrade -f
>=20
> The output of truss -p `pgrep script` is this:
> clock_gettime(13,{1316301104.000000000 }) =3D 0 (0x0)
> select(5,{0 4},0x0,0x0,{30.000000 }) =3D 1 (0x1)
> read(0,0x7fffffffcdf0,1024) =3D 0 (0x0)
> write(4,0x7fffffffcdf0,0) =3D 0 (0x0)
> clock_gettime(13,{1316301104.000000000 }) =3D 0 (0x0)
> select(5,{0 4},0x0,0x0,{30.000000 }) =3D 1 (0x1)
> read(0,0x7fffffffcdf0,1024) =3D 0 (0x0)
> write(4,0x7fffffffcdf0,0) =3D 0 (0x0)
> clock_gettime(13,{1316301104.000000000 }) =3D 0 (0x0)
> select(5,{0 4},0x0,0x0,{30.000000 }) =3D 1 (0x1)
> read(0,0x7fffffffcdf0,1024) =3D 0 (0x0)
> write(4,0x7fffffffcdf0,0) =3D 0 (0x0)
> clock_gettime(13,{1316301104.000000000 }) =3D 0 (0x0)
> select(5,{0 4},0x0,0x0,{30.000000 }) =3D 1 (0x1)
> read(0,0x7fffffffcdf0,1024) =3D 0 (0x0)
> write(4,0x7fffffffcdf0,0) =3D 0 (0x0)
>=20
> So it is really fast in reading and writing 0 bytes most of the time.
>=20
> I also found http://web.archiveorange.com/archive/v/6ETvLvjo60Gj9geAUAb6 =
=20
> and I think I am better of by rewriting my command so stdin/stdout is =20
> still the terminal. Although the link is a couple of years old.
>=20
> Is this known? Can somebody explain me why my xargs command is not workin=
g =20
> well?
>=20
Are you absolutely sure that its script(1) causing this ? 100% CPU usage
has been a known side effect of screen(1) for quite some time. Rebuild
it and try again.
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