On Fri, Sep 9, 2016 at 1:01 PM, Heikki Linnakangas <hlinn...@iki.fi> wrote: > I'm happy with what it looks like. We are in fact getting a more sequential > access pattern with these patches, because we're not expanding the pre-read > tuples into SortTuples. Keeping densely-packed blocks in memory, instead of > SortTuples, allows caching more data overall.
Wow, this is really cool. We should do something like this for query execution too. I still didn't follow exactly why removing the prefetching allows more sequential i/o. I thought the whole point of prefetching was to reduce the random i/o from switching tapes. -- greg -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
