On Thu, Sep 4, 2014 at 12:36 AM, Andres Freund <and...@2ndquadrant.com> wrote: > It's imo quite clearly better to keep it allocated. For one after > postmaster started the checkpointer successfully you don't need to be > worried about later failures to allocate memory if you allocate it once > (unless the checkpointer FATALs out which should be exceedingly rare - > we're catching ERRORs). It's much much more likely to succeed > initially. Secondly it's not like there's really that much time where no > checkpointer isn't running.
In principle you could do the sort with the full sized array and then compress it to a list of buffer IDs that need to be written out. This way most of the time you only need a small array and the large array is only needed for a fraction of a second. Regards, Ants Aasma -- Cybertec Schönig & Schönig GmbH Gröhrmühlgasse 26 A-2700 Wiener Neustadt Web: http://www.postgresql-support.de -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
