Re: Speed up Clog Access by increasing CLOG buffers

On Thu, Apr 7, 2016 at 6:48 PM, Andres Freund <andres@anarazel.de> wrote:
>
> On 2016-04-07 18:40:14 +0530, Amit Kapila wrote:
> > This is the data with -b tpcb-like@1 with 20-min run for each version and I
> > could see almost similar results as the data posted in previous e-mail.
> >
> > Client Count/Patch_ver (tps) 256
> > clog_buf_128 40617
> > clog_buf_128 +group_clog_v8 51137
> > clog_buf_128 +content_lock 54188
> >
> > For -b select-only@3,  I have done quicktest for each version and number is
> > same 62K~63K for all version, why do you think this will improve
> > select-only workload?
>
> What I was looking for was pgbench with both -btpcb-like@1
> -bselect-only@3 specified; i.e. a mixed read/write test.
>

Okay, I can again take the performance data, but on what basis are we ignoring the variation of results on power m/c, previous to this I have not seen such a variation for read-write tests.