On Fri, May 6, 2016 at 12:11 AM, Robert Haas <robertmh...@gmail.com> wrote:
> On Thu, May 5, 2016 at 1:32 PM, Tom Lane <t...@sss.pgh.pa.us> wrote:
> > * As is somewhat customary for early drafts of the notes, I've made no
> > attempt to call out which are the most significant changes.  I've not
> > tried to isolate the non-backwards-compatible items, either.
> There was quite a bit of discussion of this on pgsql-advocacy, and the
> press release we're going to put out surely must say something.  It
> wouldn't hurt if the release notes at least somewhat matched that.

I think with PostgreSQL 9.6, the OLTP workloads (short queries) will see a
major performance improvement for both read-write as well as read-only
workloads mainly due to below features (there could be others as well, but
this is what comes to my mind first):

Replace shared-buffer header spinlocks with atomic operations to improve
Partition the freelist for shared hash tables, to reduce contention on
many-CPU servers
Reduce contention for the ProcArrayLock
Where feasible, trigger kernel writeback after a configurable number of
Increase the number of clog buffers for better scalability

I think we should add that as a significant change.

With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com

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