From: Robert Banz (no email)
Date: Thu Oct 05 2006 - 14:30:01 EDT
On Oct 5, 2006, at 13:59, Elizabeth Schwartz wrote:
> >There's a bug in ZFS regarding performance problems when fsync'ing
> >file descriptors -- there's apparently going to be a patch coming
> >"real soon now" -- your options are:
>
> Thanks!
>
> Ugh, that would be bad news. Except, I think the delay is happening
> earlier. The delay is between the A001 login and A001 ok, and the
> only zfs file system is the mail spool (I should have spelled that
> out)
>
> I've been playing with the dtrace toolkit this afternoon - still a
> bit stuck on how to get from my tcp port connection to the process
> number to run dtrace dtruss (lsof *should* be the right tool but
> I'm missing a step somewhere)
"topsyscall" is also really a good way to see what fun things are
going on with the machine. Damn I'm in love with dtrace ;)
Once you find out what your PID is after you connect, connect
'dapptrace' to it. It'll give you a run down of all of the function
calls* that are going on (as they're going on), so you'll really get
an idea of what's going on.
*yes, function calls. Not just syscalls. Don't ask how it works --
it's magic.
-rob
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