| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Jan Wieck <JanWieck(at)Yahoo(dot)com> |
| Cc: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>, Manfred Koizar <mkoi-pg(at)aon(dot)at>, pgsql-patches(at)postgresql(dot)org |
| Subject: | Re: Reduce heap tuple header size |
| Date: | 2002-06-21 13:44:36 |
| Message-ID: | 19025.1024667076@sss.pgh.pa.us |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers pgsql-patches |
Jan Wieck <JanWieck(at)Yahoo(dot)com> writes:
> Do we have any hard numbers on that? Is it just access to the header
> fields, or do we loose the offset cacheability of all fixed size fields
> at the beginning of a row? In the latter case count me into the
> slowness-believer camp.
I don't believe the patch would have made the header variable size,
only changed what the fixed size is. The slowdown I was worried about
was just a matter of a couple extra tests and branches in the tqual.c
routines; which would be negligible if they weren't such hotspots.
regards, tom lane
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Jan Wieck | 2002-06-21 13:46:38 | Re: Reduce heap tuple header size |
| Previous Message | Tom Lane | 2002-06-21 13:39:15 | Re: Idea for the statistics collector |
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Jan Wieck | 2002-06-21 13:46:38 | Re: Reduce heap tuple header size |
| Previous Message | Tom Lane | 2002-06-21 13:22:14 | Re: Reduce heap tuple header size |