| From: | Noah Misch <noah(at)leadboat(dot)com> |
|---|---|
| To: | Peter Geoghegan <pg(at)heroku(dot)com> |
| Cc: | Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Marti Raudsepp <marti(at)juffo(dot)org>, Stephen Frost <sfrost(at)snowman(dot)net>, Greg Stark <stark(at)mit(dot)edu>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Thom Brown <thom(at)linux(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: B-Tree support function number 3 (strxfrm() optimization) |
| Date: | 2014-08-06 05:01:56 |
| Message-ID: | 20140806050156.GA91445@tornado.leadboat.com |
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| Lists: | pgsql-hackers |
On Tue, Aug 05, 2014 at 09:32:59PM -0700, Peter Geoghegan wrote:
> On Tue, Aug 5, 2014 at 8:55 PM, Noah Misch <noah(at)leadboat(dot)com> wrote:
> > Comparator cost affects external sorts more than it affects internal sorts.
> > When I profiled internal and external int4 sorting, btint4cmp() was 0.37% of
> > the internal sort profile and 10.26% of the external sort profile.
>
> Did you attempt to characterize where wall time was being spent?
No. I have the perf data files, if you'd like to see any particular report.
--
Noah Misch
EnterpriseDB http://www.enterprisedb.com
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