[jboss-dev-forums] [Design of Kosmos] - Re: Performance with many projects

[aron.gombas]

Some explanation.
Kosmos is caching two kind of data:

1. Java objects (the model itself) that represent SVN repositories in this case. These are stored in the ehcache storage.

2. Generated content files (mostly images) that are charts in this case. These files must be cleaned up, when a more uptodate version gets generated. 
These are stored in the WebDAV storage (by default), and it might be expensive to delete the files from those. The first time you launch Kosmos, there's nothing to clean, so that's why it's faster. If you like, you can manually delete the stuffs from WebDAV before starting up the container.

Of course, changing the ehcache configuration will not have any impact on the second.
And, 2 is pluggable, so you can use other mechanisms to store your images. (AFAIK the JBoss Labs guys developed some custom solution based on their Shotoku for this purpose.)

I hope this helps to understand what's going on.

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