| From: | Neil Conway <neilc(at)samurai(dot)com> |
|---|---|
| To: | Larry Rosenman <ler(at)lerctr(dot)org> |
| Cc: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Andrew Sullivan <andrew(at)libertyrms(dot)info>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Experimental patch for inter-page delay in VACUUM |
| Date: | 2003-11-10 18:40:24 |
| Message-ID: | 87vfpsysmf.fsf@mailbox.samurai.com |
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| Lists: | pgsql-hackers |
Larry Rosenman <ler(at)lerctr(dot)org> writes:
> You might also look at Veritas' advisory stuff.
Thanks for the suggestion -- it looks like we can make use of
this. For the curious, the cache advisory API is documented here:
http://www.lerctr.org:8458/en/man/html.7/vxfsio.7.html
http://www.lerctr.org:8458/en/ODM_FSadmin/fssag-9.html#MARKER-9-1
Note that unlike for posix_fadvise(), the docs for this functionality
explicitly state:
Some advisories are currently maintained on a per-file, not a
per-file-descriptor, basis. This means that only one set of
advisories can be in effect for all accesses to the file. If two
conflicting applications set different advisories, both use the
last advisories that were set.
-Neil
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