Date: Sun, 18 Jan 2009 15:28:19 +0200 From: Kostik Belousov <kostikbel@gmail.com> To: Peter Holm <pho@freebsd.org> Cc: Dag-Erling Sm?rgrav <des@des.no>, freebsd-arch@freebsd.org Subject: Re: stress2 is now in projects Message-ID: <20090118132819.GS48057@deviant.kiev.zoral.com.ua> In-Reply-To: <20090118131028.GA26179@x2.osted.lan> References: <20090118082145.GA18067@x2.osted.lan> <86iqocstjm.fsf@ds4.des.no> <20090118131028.GA26179@x2.osted.lan>
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--nSQp8DZZn7gZbDHt Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sun, Jan 18, 2009 at 02:10:28PM +0100, Peter Holm wrote: > On Sun, Jan 18, 2009 at 01:11:25PM +0100, Dag-Erling Sm?rgrav wrote: > > Peter Holm <pho@freebsd.org> writes: > > > The key functionality of this test suite is that it runs a random > > > number of test programs for a random period, in random incarnations > > > and in random sequence. > >=20 > > In other words, it's non-deterministic and non-reproducable. > >=20 >=20 > Yes, by design. >=20 > > You should at the very least allow the user to specify the random seed. > >=20 >=20 > Yes, it would be interesting to see if this is enough to reproduce a > problem in a deterministic way. I'll look into this. I shall state from my experience using it (or, rather, inspecting bug reports generated by stress2), that in fact it is quite repeatable. I.e., when looking into one area, you almost always get _that_ problem, together with 2-3 related issues. Due to the nature of the tests and kernel undeterministic operations, I think that use of the same random seed gains nothing in regard with repeatability of the tests. --nSQp8DZZn7gZbDHt Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (FreeBSD) iEYEARECAAYFAklzLnIACgkQC3+MBN1Mb4hZvwCggBe2mzNy2k9tJKXTcl97p2jt CtYAoNj5zt2iHC3fw21shvfNiGpokWEB =I4hn -----END PGP SIGNATURE----- --nSQp8DZZn7gZbDHt--
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