Re: session servers in ram - Mailing list pgsql-performance

From Ron Mayer
Subject Re: session servers in ram
Date
Msg-id 4AB91107.2000503@cheapcomplexdevices.com
Whole thread Raw
In response to Re: session servers in ram  (Alan Hodgson <ahodgson@simkin.ca>)
Responses Re: session servers in ram
List pgsql-performance
Alan Hodgson wrote:
> On Monday 21 September 2009, Scott Marlowe <scott.marlowe@gmail.com> wrote:
>> I'm looking at running session servers in ram.
>
> Use memcached for session data.

IMHO postgres is more appropriate for some types of session data.

One of the apps I work on involves session data that consists of
geospatial data which we store and index in postgres/postgis.

Scott Marlowe wrote:
> I'm looking at running session servers in ram.
>  We're currently IO write bound with
> fsync=off using a 15k5 seagate SAS drive, so I'm hoping that moving
> the db into /dev/shm will help quite a bit here.

"a 15k5 seagate SAS drive"

Is this implying that you have "a" == one session server?  I
bet that it'd be cheaper to throw a bunch of cheap boxes
in there and make a pool of session servers rather than one
fast one.   When a new session is created, your application
code can then pick the least loaded session server and put
the session-server-number in a cookie.

This approach works fine for me - but I suspect I have many
fewer, yet probably much larger sessions going through the
system.




> Does anybody any real world experience here or any words of sage
> advice before I go off and start testing this?
>


pgsql-performance by date:

Previous
From: Alan Hodgson
Date:
Subject: Re: session servers in ram
Next
From: Scott Marlowe
Date:
Subject: Re: session servers in ram