Re: [geowebcache-users] GWC in production

[John M. <mit...@gm...>]

Arne,

Because my windows server OS was 64 bit I installed 64 bit Java and
had Apache Tomcat point to the 64 bit java and then I allocated 2 GB
out of 4 GB of RAM to Apache Tomcat.
But based on what you stated in the below email it sounds like I
should not allocate all this memory to Apache Tomcat.

Correct?

John

---------- Forwarded message ----------
From: Arne Kepp <ar...@ti...>
Date: Thu, 20 May 2010 11:26:16 +0200
Subject: Re: [geowebcache-users] GWC in production
To: Gabriel Roldan <gr...@op...>
Cc: geo...@li...

I think the bullet points cover a fair bit of ground, but obviously have
to be elaborated.

Hardware considerations: Lots of spare RAM, and don't give it to Java or
specific processes, let the disk block cache have it. Regular SATA
drives or RAID arrays work fine, if you use NAS or SAN then things
become a bit more tricky. Often these devices have a ton of overhead due
to capabilities like deduplication, shared locks and so forth, and
sometimes they kill the disk block cache altogether.

After you move into production, the harddrive access LED indicators are
actually not a bad thing to check (if you are not using SSDs), but also
the IO Wait percentange in utilities like top is important.

NTFS sucks, Ext3 and 4 are okay, XFS is good, btrfs should be good. Not
tried ZFS, but that should be good too.

If you have lots of clients and a big iron, configure Tomcat to support
at least 2000 threads. Configure the OS to support at least 4 times as
many open files.

I've never focused on optimizing the generation of tiles, since WMS
tends to be the limiting factor. But Andrea has mentioned locks in the
Java2D system. It would be interesting to do tests to see if running
multiple JVMs in parallel performs better than a single one (especially
on 4 to 8 core servers).

-Arne



On 05/18/2010 10:56 PM, Gabriel Roldan wrote:
> Hey all,
>
> I'm about to try giving some content to the GWC in production section
> of the documentation
> <http://geowebcache.org/docs/current/production/index.html>
>
> I'd be awesome if you, the power users could share any advise that you
> had to follow in order to get GWC working on a production environment
> for you.
>
> Arne, if you have some quick ideas please tell back too, I'm sure
> nobody have set up as many GWC instances as you :)
>
> TIA,
>
> Gabriel


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-- 
John J. Mitchell