Items that you store in memory with mod_perl are only available to the same
apache process, so that may not help you much. You could try using
IPC::Shareable or IPC::ShareLite to make
your datastructure available across processes. This can buy you a lot
of performance, but has a lot of risks (i.e. if you reboot your
system the data in shared memory is gone, unless you have a facility to write
it to disk). Your best bet is probably to use a real database (Postgres, mysql, etc...)
and if it isn't fast enough for you then consider some sort of
in-memory caching. mod_perl can buy you a lot with traditional databases
performance wise (presistant cached database handles, etc..)
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