adding to existing install

I have an Ubuntu server running on old hardware to collect statistics
and draw graphs.  Every once in a while the higher-ups decide they want
an insane number of graphs drawn.  I'm looking for something that would
let me hook in some extra processing power when I need it.  From what
I've seen, openssi might well do it, but I'm not seeing anything in the
documentation about adding it to an existing install.  Can anyone offer
me any useful advice?  And has anyone made openssi work with ubuntu?  I
can rebuild the system if I have to, but I'd really rather avoid it as
the configuration is somewhat touchy.

LMP

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