Обсуждение: connection pool
Hallo Need your help 1 got a Site runnig php 4.4.2 and postgresql (8.1.4) and Follwing problem - 4 Server (Apache) up to 300 clients connection to the DB - 1 DB machine So: - If I run with persisent, i got up to 1200 Connction and I run out of memeory - if I run with no persisent connection i got massive forking of postgres (but less problems) How can I build up a Pool of Connections ? What about "Pgpool" ? Thanks
Hi, I had the same trouble 6 years ago with my beginning of Postgresql ... 4 web and 1 db ... Just put a limitation in the php.ini ; Maximum number of persistent links. -1 means no limit. pgsql.max_persistent = 18 ; Maximum number of links (persistent+non persistent). -1 means no limit. pgsql.max_links = 18 It'll run perfectly ... for me it's like that since 6 years ... and I have thousand of visitor each day on my services :o) Regards, Le lundi 31 juillet 2006 21:48, Peter Hofer a écrit : > Hallo > > Need your help > > 1 got a Site runnig php 4.4.2 and postgresql (8.1.4) and > Follwing problem > > - 4 Server (Apache) up to 300 clients connection to the DB > - 1 DB machine > > So: > > - If I run with persisent, i got up to 1200 Connction and I run out > of memeory > > - if I run with no persisent connection i got massive forking of postgres > (but less problems) > > How can I build up a Pool of Connections ? > > What about "Pgpool" ? > > Thanks > > > > > > > > > > > > > > ---------------------------(end of broadcast)--------------------------- > TIP 5: don't forget to increase your free space map settings -- Hervé Piedvache NOUVELLE ADRESSE - NEW ADDRESS : Elma Ingénierie Informatique 3 rue d'Uzès F-75002 - Paris - France Pho. 33-144949901 Fax. 33-144882747
Hy Thanks for your answer As far as i know " pgsql.max_persistent " limits the no on Persistent Connections per apache client - and not for all Apaches - so I set it "pgsql.max_persistent = 1" since we Connect to the same DB all the time Currently we got 2 Servers runnung with persistent Connection, and 2 Server with non-persitent connections Right now i have 359 progres running, 345 are idle. If I set the other servers to persistent connections, too, I will have About 700 progres running - 95% on idle They all take memory ... I will have to expand up to 10 and more WebServers in near future Therefore persistent-Connection (because of the memory amount to handle 1500 Connection) nor Non-persistent-Connection (because of forking ) is a suitable way What I think about, is a maschine getting all the Connections from the Apache, and Forward only those to the DB whitch are not idle Any idea ? Thanks Peter > -----Ursprüngliche Nachricht----- > Von: pgsql-php-owner@postgresql.org > [mailto:pgsql-php-owner@postgresql.org] Im Auftrag von Hervé Piedvache > Gesendet: Dienstag, 01. August 2006 09:29 > An: pgsql-php@postgresql.org; peter.hofer@ics.at > Betreff: Re: [PHP] connection pool > > Hi, > > I had the same trouble 6 years ago with my beginning of Postgresql ... > > 4 web and 1 db ... > > Just put a limitation in the php.ini > > ; Maximum number of persistent links. -1 means no limit. > pgsql.max_persistent = 18 > > ; Maximum number of links (persistent+non persistent). -1 > means no limit. > pgsql.max_links = 18 > > It'll run perfectly ... for me it's like that since 6 years > ... and I have thousand of visitor each day on my services :o) > > Regards, > > Le lundi 31 juillet 2006 21:48, Peter Hofer a écrit : > > Hallo > > > > Need your help > > > > 1 got a Site runnig php 4.4.2 and postgresql (8.1.4) and Follwing > > problem > > > > - 4 Server (Apache) up to 300 clients connection to the DB > > - 1 DB machine > > > > So: > > > > - If I run with persisent, i got up to 1200 Connction and I run out > > of memeory > > > > - if I run with no persisent connection i got massive > forking of postgres > > (but less problems) > > > > How can I build up a Pool of Connections ? > > > > What about "Pgpool" ? > > > > Thanks > > > > > > > > > > > > > > > > > > > > > > > > > > > > ---------------------------(end of > > broadcast)--------------------------- > > TIP 5: don't forget to increase your free space map settings > > -- > Hervé Piedvache > > NOUVELLE ADRESSE - NEW ADDRESS : > Elma Ingénierie Informatique > 3 rue d'Uzès > F-75002 - Paris - France > Pho. 33-144949901 > Fax. 33-144882747 > > ---------------------------(end of > broadcast)--------------------------- > TIP 4: Have you searched our list archives? > > http://archives.postgresql.org
On Monday 31 July 2006 15:48, Peter Hofer wrote:
> Hallo
>
> Need your help
>
> 1 got a Site runnig php 4.4.2 and postgresql (8.1.4) and
> Follwing problem
>
> - 4 Server (Apache) up to 300 clients connection to the DB
> - 1 DB machine
>
> So:
>
> - If I run with persisent, i got up to 1200 Connction and I run out
> of memeory
>
one recommendation would be to set your max # of apache children to something
less than the amount of connections you can handle on postgresql. for
example, if you can only handle 1000 connections, set the max # of children
per server to say 245 (leave 20 slots for super user connections).
one thing I do wonder about is just how much ram (or how little) you have
available. istm 1200 connections should not run you out of memory on a
dedicated db machine.
> - if I run with no persisent connection i got massive forking of postgres
> (but less problems)
>
yeah... I often recommend not using persistent connections in php since they
tend to cause trouble :-)
> How can I build up a Pool of Connections ?
>
> What about "Pgpool" ?
>
RIght... pgpool basically acts as an intermediary, so everything connects to
the pool, which then forwards on requests to the database. I would think
reducing the number of apache children would work better, but this might be
worth a shot since your mixing pg_connect and pg_pconnect between servers. If
you do please report back your experience to the list :-)
--
Robert Treat
Build A Brighter LAMP :: Linux Apache {middleware} PostgreSQL