From mboxrd@z Thu Jan 1 00:00:00 1970 From: Loic Dachary Subject: Deterministic thrashing Date: Sun, 06 Apr 2014 12:29:34 +0200 Message-ID: <53412C8E.2070504@dachary.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="9rLeOj4Qnb0mhG63h7UH9E9kXr7ijXVI9" Return-path: Received: from smtp.dmail.dachary.org ([91.121.254.229]:37551 "EHLO smtp.dmail.dachary.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754180AbaDFK3o (ORCPT ); Sun, 6 Apr 2014 06:29:44 -0400 Received: from [10.9.0.6] (openvpn.novalocal [10.145.3.13]) by smtp.dmail.dachary.org (Postfix) with ESMTPS id 065E726394 for ; Sun, 6 Apr 2014 12:29:37 +0200 (CEST) Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Ceph Development This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --9rLeOj4Qnb0mhG63h7UH9E9kXr7ijXVI9 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi Ceph, It would be nice to have a way to replay the random events injected by st= anzas such as - thrashosds: chance_pgnum_grow: 2 chance_pgpnum_fix: 1 When a teuthology workload (such as tracker.ceph.com/issues/7914#note-34)= crashes once a week and the error is not obvious, it would increase the = probability to reproduce the crash. Instead of the "trashosds" we could h= ave something like "recorded-trashosds: trashosd.events" and instead of b= eing random they would happen more deterministically (same number of even= ts and same number of seconds between events ?).=20 I realize this is non trivial to implement but maybe someone already thou= ght about that and has a better idea ? Cheers --=20 Lo=EFc Dachary, Artisan Logiciel Libre --9rLeOj4Qnb0mhG63h7UH9E9kXr7ijXVI9 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.20 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iEYEARECAAYFAlNBLJEACgkQ8dLMyEl6F22gDwCgpD7j87DnVSThSekaVBZgd/+6 ynkAoKzJ+VUM6JSrlnzbqbea1NFmWQf7 =bgLZ -----END PGP SIGNATURE----- --9rLeOj4Qnb0mhG63h7UH9E9kXr7ijXVI9--