On Wed, Mar 8, 2017 at 6:42 PM, Robert Haas <robertmh...@gmail.com> wrote: > I don't think I understand exactly why this system might be prone to a > little bit of extra prefetching - can you explain further? Let me explain with an example, suppose there are 2 workers prefetching jointly, lets assume prefetch_target is 3, so for example when both the workers prefetch 1 page each then prefetch_page count will be 2, so both the workers will go for next prefetch because prefetch_page is still less than prefetch target, so again both the workers will do prefetch and totally they will prefetch 4 pages.
> I don't think it will hurt anything as long as we are talking about a small > number of extra prefetches here and there. I completely agree with this point and I mentioned in the mail so that it don't go unnoticed. And, whatever extra prefetch we have done we will anyway use it unless we stop the execution because of some limit clause. > >> Fixed > > Committed 0001. Thanks -- Regards, Dilip Kumar EnterpriseDB: http://www.enterprisedb.com -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
