Re: how to fix problem then when two queries run at the same time, it takes longer to complete then if run in sequence

On Wed, Jul 23, 2008 at 9:21 AM, Miernik <public(at)public(dot)miernik(dot)name> wrote:
> I have a PostgreSQL database on a very low-resource Xen virtual machine,
> 48 MB RAM. When two queries run at the same time, it takes longer to
> complete then if run in sequence. Is there perhaps a way to install
> something like a query sequencer, which would process queries in a FIFO
> manner, one at a time, even if a new query comes before the last one
> running is finished, it would not give the new query to the server
> before the one running now finishes? That would greatly improve
> performance.
>
> Any tips in general for running PostgreSQL on such low-resource machine?
>
> I have:
>
> shared_buffers = 5MB
> work_mem = 1024kB
>
> are these good values, or could perhaps changing something improve it a
> bit? Any other parameters to look at?

Well, you're basically working on a really limited machine there. I'd
set shared buffers up by 1 meg at a time and see if that helps. But
you're basically looking at a very narrow problem that most people
won't ever run into. Why such an incredibly limited virtual machine?
Even my cell phone came with 256 meg built in two years ago.