On Fri, Sep 7, 2012 at 5:49 AM, Noah Misch <n...@leadboat.com> wrote: > On Fri, Sep 07, 2012 at 01:37:57AM -0700, Daniel Farina wrote: >> On Thu, Sep 6, 2012 at 3:04 AM, Noah Misch <n...@leadboat.com> wrote: >> > On Tue, Sep 04, 2012 at 09:46:58AM -0700, Daniel Farina wrote: >> >> I might try to find the segments leading up to the overflow point and >> >> try xlogdumping them to see what we can see. >> > >> > That would be helpful to see. >> > >> > Just to grasp at yet-flimsier straws, could you post (URL preferred, else >> > private mail) the output of "objdump -dS" on your "postgres" executable? >> >> https://dl.dropbox.com/s/444ktxbrimaguxu/txid-wrap-objdump-dS-postgres.txt.gz > > Thanks. Nothing looks amiss there. > > I've attached the test harness I used to try reproducing this. It worked > through over 500 epoch increments without a hitch; clearly, it fails to > reproduce an essential aspect of your system. Could you attempt to modify it > in the direction of better-resembling your production workload until it > reproduces the problem?
Sure, I can mess around with it on our exact environment as well (compilers, Xen, et al). We have not seen consistent reproduction either -- most epochs seem to fail to increment (sample size: few, but more than three) but epoch incrementing has happened more than zero times for sure. I wonder if we can rope in this guy, who is the only other report I've seen of this: http://lists.pgfoundry.org/pipermail/skytools-users/2012-March/001601.html So I'm CCing him.... He seems to have reproduced it in 9.1, but I haven't seen his operating system information on my very brief skim of that thread. -- fdr -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
