[freenet-dev] Increasing the default memory limit?

[Matthew Toseland]

What should the default memory limit be on install? We can provide a means to 
override it in the first-time wizard, but it's not clear what the default 
should be.

If it's too low, once the user has some stuff queued and a large datastore, 
the node will spend a lot of its time garbage collecting, and the datastore 
code will cause a lot of system usage (time spent doing I/O) on larger stores 
because it won't have cached much of the index (the kernel might have, but 
that's debatable, and still very slow compared to caching it in the database, 
this apparently causes high system usage - higher than user - on heavily used 
nodes).

On the other hand if it's too high, it will cause swapping and major problems.

Either way we can get serious performance degradation and users uninstalling.

Ideas? Java doesn't provide any way to get the total memory available to the 
system afaik.
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