| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Peter Geoghegan <pg(at)heroku(dot)com> |
| Cc: | Jim Nasby <jim(at)nasby(dot)net>, Robert Haas <robertmhaas(at)gmail(dot)com>, Andres Freund <andres(at)2ndquadrant(dot)com>, Merlin Moncure <mmoncure(at)gmail(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Clock sweep not caching enough B-Tree leaf pages? |
| Date: | 2014-04-22 01:12:38 |
| Message-ID: | 10400.1398129158@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Peter Geoghegan <pg(at)heroku(dot)com> writes:
> On Mon, Apr 21, 2014 at 5:50 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> ARC *was* the predecessor algorithm. See commit 5d5087363.
> I believe that the main impetus for replacing ARC with clock sweep
> came from patent issues, though.
That was one issue, but performance gains were a large part of it too,
and the main reason why we picked clock sweep rather than something else.
Did you read the commit message I pointed to?
(See also 4e8af8d27.)
regards, tom lane
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