On Thu, 2007-03-01 at 11:00 +0900, ITAGAKI Takahiro wrote: > "Simon Riggs" <[EMAIL PROTECTED]> wrote: > > > > > VACUUM's current behaviour is to take blocks it has touched and place > > > > them on the head of the freelist, allowing them to be reused. > > > > > > No, it puts them at the tail of the freelist. > > > > That's a minor point because the freelist is mostly empty, so head == > > tail in 99.9% of cases. > > That's correct. Also, even if a VACUUM process collects some unused buffers > into the freelist, other backends comsume all of them in a moment.
AFAICS the patch is useful and valid. Please could we have some additional testers, so that we have a range of opinion, rather than just my/EDB tests. I'll submit further detailed tests after feature freeze, since right now I have other things to do, but I'll return to this point again. -- Simon Riggs EnterpriseDB http://www.enterprisedb.com ---------------------------(end of broadcast)--------------------------- TIP 7: You can help support the PostgreSQL project by donating at http://www.postgresql.org/about/donate
