On Mon, Apr 25, 2016 at 6:04 PM, Alexander Korotkov < a.korot...@postgrespro.ru> wrote:
> On Sun, Apr 17, 2016 at 7:32 PM, Amit Kapila <amit.kapil...@gmail.com> > wrote: > >> On Thu, Apr 14, 2016 at 8:05 AM, Andres Freund <and...@anarazel.de> >> wrote: >> > >> > On 2016-04-14 07:59:07 +0530, Amit Kapila wrote: >> > > What you want to see by prewarming? >> > >> > Prewarming appears to greatly reduce the per-run variance on that >> > machine, making it a lot easier to get meaningful results. >> > >> >> I think you are referring the tests done by Robert on power-8 m/c, but >> the performance results I have reported were on intel x86. In last two >> days, I have spent quite some effort to do the performance testing of this >> patch with pre-warming by using the same query [1] as used by Robert in his >> tests. The tests are done such that first it start server, pre-warms the >> relations, ran read-only test, stop server, again repeat this for next test. >> > > What did you include into single run: test of single version (HEAD or > Patch) or test of both of them? > single run includes single version (either HEAD or Patch). > > >> I have observed that the variance in run-to-run performance still occurs >> especially at higher client count (128). Below are results for 128 client >> count both when the tests ran first with patch and then with HEAD and vice >> versa. >> >> Test-1 >> ---------- >> client count - 128 (basically -c 128 -j 128) >> >> first tests ran with patch and then with HEAD >> >> Patch_ver/Runs HEAD (commit -70715e6a) Patch >> Run-1 156748 174640 >> Run-2 151352 150115 >> Run-3 177940 165269 >> >> >> Test-2 >> ---------- >> client count - 128 (basically -c 128 -j 128) >> >> first tests ran with HEAD and then with patch >> >> Patch_ver/Runs HEAD (commit -70715e6a) Patch >> Run-1 173063 151282 >> Run-2 173187 140676 >> Run-3 177046 166726 >> >> I think this patch (padding pgxact) certainly is beneficial as reported >> above thread. At very high client count some variation in performance is >> observed with and without patch, but I feel in general it is a win. >> > > So, what hardware did you use for these tests: power-8 or x86? > x86 > How long was single run? > 5 minutes. With Regards, Amit Kapila. EnterpriseDB: http://www.enterprisedb.com
