From: | Brett McCormick <brett(at)work(dot)chicken(dot)org> |
---|---|
To: | Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us> |
Cc: | tgl(at)sss(dot)pgh(dot)pa(dot)us (Tom Lane), pgsql-hackers(at)postgreSQL(dot)org |
Subject: | Re: [HACKERS] Anyone working on asynchronous NOTIFY reception? |
Date: | 1998-04-15 21:28:44 |
Message-ID: | 13621.9792.56866.280748@abraxas.scene.com |
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Lists: | pgsql-hackers |
I don't know how many clients you're running, but sending an empty
query every second or three isn't too much of a performance hit (I
know it still sucks though)..
could you cc copies of mail to the list? I'm sure we're very
interested..
On Wed, 15 April 1998, at 16:57:43, Bruce Momjian wrote:
> > I'm looking at an application that involves several client processes
> > communicating in real time via a pgsql database. "Real time" means
> > that when one client writes something, any other clients that are
> > interested need to know about it within a few seconds at most.
> > The other clients can use LISTEN/NOTIFY to detect updates --- but
> > I don't think I can accept the notion of continuously doing empty
> > queries to receive the notifies. That'll drive performance into the
> > ground. What I want is for a client to be able to sleep until
> > something interesting happens.
>
> The person who knows the most about this is:
>
> dz(at)cs(dot)unitn(dot)it (Massimo Dal Zotto)
>
>
> --
> Bruce Momjian | 830 Blythe Avenue
> maillist(at)candle(dot)pha(dot)pa(dot)us | Drexel Hill, Pennsylvania 19026
> + If your life is a hard drive, | (610) 353-9879(w)
> + Christ can be your backup. | (610) 853-3000(h)
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