From: Loic Dachary <loic@dachary.org>
To: Ceph Development <ceph-devel@vger.kernel.org>
Subject: Deterministic thrashing
Date: Sun, 06 Apr 2014 12:29:34 +0200 [thread overview]
Message-ID: <53412C8E.2070504@dachary.org> (raw)
[-- Attachment #1: Type: text/plain, Size: 759 bytes --]
Hi Ceph,
It would be nice to have a way to replay the random events injected by stanzas 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 have something like "recorded-trashosds: trashosd.events" and instead of being random they would happen more deterministically (same number of events and same number of seconds between events ?).
I realize this is non trivial to implement but maybe someone already thought about that and has a better idea ?
Cheers
--
Loïc Dachary, Artisan Logiciel Libre
[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 263 bytes --]
next reply other threads:[~2014-04-06 10:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-06 10:29 Loic Dachary [this message]
2014-04-07 16:55 ` Deterministic thrashing Gregory Farnum
2014-04-07 17:13 ` Loic Dachary
2014-04-07 17:16 ` Gregory Farnum
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=53412C8E.2070504@dachary.org \
--to=loic@dachary.org \
--cc=ceph-devel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.