Re: pgbench: faster version of tpcb-like transaction

On Sat, Aug 26, 2017 at 4:28 PM, Peter Geoghegan <pg(at)bowt(dot)ie> wrote:

> On Sat, Aug 26, 2017 at 3:53 PM, Jeff Janes <jeff(dot)janes(at)gmail(dot)com> wrote:
> > I get nearly a 3 fold speed up using the new transaction, from 9184 to
> 26383
> > TPS, on 8 CPU machine using scale 50 and:
> >
> > PGOPTIONS="-c synchronous_commit=off" pgbench -c32 -j32 -T60 -b tpcb-like
>
> What about with "-M prepared"? I think that most of us use that
> setting already, especially with CPU-bound workloads.
>

I still get a 2 fold improvement, from 13668 to 27036, when both
transactions are tested with -M prepared.

I am surprised, I usually haven't seen that much difference for the default
queries between prepared or not, to the point that I got out of the habit
of testing with it. But back when I was testing with and without
systematically, I did notice that it changed a lot depending on hardware
and concurrency. And of course from version to version different
bottlenecks come and go.

And thanks to Tom for letting me put -M at the end of the command line now.

Cheers,

Jeff