Brad Nicholson <bnichols@ca.afilias.info> 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