| From: | Jeff Davis <pgsql(at)j-davis(dot)com> |
|---|---|
| To: | Peter Geoghegan <pg(at)bowt(dot)ie>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
| Cc: | PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: logtape.c stats don't account for unused "prefetched" block numbers |
| Date: | 2020-09-08 17:27:06 |
| Message-ID: | 0383d21d58c6fd7d2426d7730c50c6743a5ba303.camel@j-davis.com |
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| Thread: | |
| Lists: | pgsql-hackers |
On Sat, 2020-09-05 at 12:03 -0700, Peter Geoghegan wrote:
> We should totally disable the preallocation stuff for external sorts
> in any case. External sorts are naturally characterized by relatively
> large, distinct batching of reads and writes -- preallocation cannot
> help.
Patch attached to disable preallocation for Sort.
I'm still looking into the other concerns.
Regards,
Jeff Davis
| Attachment | Content-Type | Size |
|---|---|---|
| sort-no-prealloc.patch | text/x-patch | 5.7 KB |
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