I just spent about an hour implementing some basic dtrace SDT probes
in imapd. Here's a simple example that ranks SELECT'ed folders... a
decent way to see which folder is most popular on your server over the
time you allow the dtrace script to collect data:
---------
[root@mercury]/>dtrace -n 'cyrusimap*:::folder-select
{@counts[copyinstr(arg0),copyinstr(arg1)] = count();}'
dtrace: description 'cyrusimap*:::folder-select ' matched 4 probes
^C
daleg ASTRO/LOSMANDY-USERS 1
daleg GEEKS 1
daleg GOA 1
daleg OPENSOLARIS/ZONES-DISCUSS 1
daleg ASTRO/STARRYNIGHT 2
daleg OPENSOLARIS/ZFS-DISCUSS 2
daleg ASTRO/LOSMANDY-USERS 2
daleg INBOX 3
----------
So like I said... basic. On my little personal server, things aren't
so busy as you can see (me opening my inbox happens the most), but you
get the point ;)
But probes could be put around various database opens (mailbox db,
quota db) in order to derive how long it took to open them, as well as
other imap commands and whatnot. Anyone have any ideas on what they'd
like to monitor with dtrace? I'll see about implementing what I can.
/dale
--
Dale Ghent
Specialist, Storage and UNIX Systems
UMBC - Office of Information Technology
ECS 201 - x51705
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