Brad Nicholson <bnichols@xxxxxxxxxxxxxxx> writes: > On 10/27/2010 4:10 PM, Tom Lane wrote: >> AFAICT from googling, AIX does have posix_fadvise, though maybe it >> doesn't do anything useful ... > If there is an easy way to check if it does do anything useful? If so, > I can check it out. If you don't see any performance change in bitmap scans between effective_io_concurrency = 0 and effective_io_concurrency = maybe 4 or so, then you could probably conclude it's a no-op. regards, tom lane -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
