hg push getting worse?

[Tim Bell]

I wrote:

> ZFS snapshots are supposed to be lightweight and inexpensive.  We
> still have them going back to the beginning of time on hg.ojn.
> 
> Perhaps we have accumulated enough to expose quadratic (or worse)
> performance problems.  I will do some searching over on OpenSolaris.

I spent ten or fifteen minutes searching on this issue.  The short
version is that there has been a significant amount of ZFS
performance work done since
  "Solaris Express Developer Edition 9/07 snv_70a X86"
which is the release hg.ojn is running.  That was the best choice
back when we set the server up, but now it is pretty old.

Here are a few examples - all of these are marked FIXed in builds
more recent than 70a.  (FYI: OpenSolaris is currently up around b121):

6596190 ""zfs list" is slow due to version property"
http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6596190

6386929 "initial "zfs list" is slow"
http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6386929

6755389 "Initial run of any zfs command that iterates over datasets can be slow"
http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6755389

Here is a message thread related to 'zfs list' being slow:
  http://mail.opensolaris.org/pipermail/zfs-discuss/2008-July/019956.html


hg.ojn has been extremely stable since we set it up - it currently
has 652 days of uptime.  All the same, it it probably time to start
planning an upgrade.

Tim