Michael Monnerie <michael.monnerie@is.it-management.at> writes:
> On Montag 15 Juni 2009 Tom Lane wrote:
>> These two settings are probably the cause. �With shared_buffers at
>> 2GB, you do not have anywhere near 1GB to play around with in a
>> 32-bit environment. �Try something like 200M and 500M.
> Wouldn't a recommendation to switch to 64bit PostgreSQL be a good idea
> also? Maybe his servers can't do that, I don't know.
If he wants numbers that high, he'd need to go to a 64bit build.
It's not clear from here whether any actual benefit would ensue, though.
> Also, I've heard that using shared_buffers = 500MB is enough (even in
> 64bit), and the rest will be cached by Linux cache alone. Is that true?
Yeah, the existence of kernel disk cache tends to negate the benefit of
very large shared_buffer settings. See the pgsql-performance archives
for many many discussions about such matters.
regards, tom lane
