hg push getting worse?

Tim Bell Tim.Bell at Sun.COM
Thu Aug 13 13:33:23 PDT 2009

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"

6386929 "initial "zfs list" is slow"

6755389 "Initial run of any zfs command that iterates over datasets can be slow"

Here is a message thread related to 'zfs list' being slow:

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.


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