On 29 September 2010 11:38, Hilton Gibson <[email protected]> wrote:
> Using the XMLUI.
> Does DSpace really need this and what happens when we go to one million
> items ??
>
>
Does DSpace really need that? No. As I have said, I'm running 30 separate
repositories - using JSPUI (circa 1.4.2 / 1.5 codebase) - all on a single
server / Tomcat instance.
Some of those repositories have 1000s of items, and get quite decent levels
of access.
The server has 8GB installed, 3GB heap turned over to Tomcat (plus 1GB for
non-heap).
The Tomcat instance has 2GB of *free* heap space, rarely runs above 5% cpu
usage, and has plenty of capacity to run more repositories (the rate at
which files are opened/closed is actually a bigger issue for Tomcat
startup).
Although, it's worth pointing out that the database is hosted on a separate
server - I can't say how many resources that is really using, as it's shared
with other services, but it is apparently 'tiny'.
What happens at one million items? Well, that's an interesting issue. But is
it really the right question to be asking? How far do you want/need to be
able to scale a 'monolithic' instance, before you spread it over multiple
servers?
As long as you can spread it over multiple servers, it gives you a much
higher ceiling than relying on a single box - and it is easier to scale for
increasing size/usage by adding more boxes (you don't have to migrate).
If you focus on scaling a single installation, then you end up increasing
the overall requirements (ie. memory for caching), and make it harder to
have scaling over multiple boxes at all.
G
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