Peter Geoghegan <p...@heroku.com> writes: > On Mon, Apr 21, 2014 at 5:28 PM, Tom Lane <t...@sss.pgh.pa.us> wrote: >> We used to have one. It was a big bottleneck --- and this was years >> ago, when the buffer manager was much less scalable than it is today. >> (IIRC, getting rid of a central lock was one of the main advantages >> of the current clock sweep code over its predecessor.)
> Yes, it was. This is a major advantage of clock sweep, and anything > that replaces it will need to maintain the same advantage. Didn't > someone indicate that clock sweep could beat ARC around that time, > presumably for this reason? If no one did, then my reading of a > variety of other papers on caching indicates that this is probably the > case. ARC *was* the predecessor algorithm. See commit 5d5087363. regards, tom lane -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers