[freenet-dev] BDB uses far more memory than it's supposed to; ideas?

[Jano]

Matthew Toseland wrote:

> On Fri, Feb 02, 2007 at 12:05:20AM +0100, Jano wrote:
>> Matthew Toseland wrote:
>> 
>> > On Wed, Jan 31, 2007 at 08:46:14PM +0100, Jano wrote:
>> >> Bob Ham wrote:
>> >> 
>> >> > I think there are deeper issues to deal with.  Even disregarding the
>> >> > database, fred's memory footprint is massive.  For the functionality
>> >> > that it provides, it seems to me to be excessive.  I can't
>> >> > understand why fred would need anything in excess of a few 10s of
>> >> > megabytes. Where is this memory going?
>> >> 
>> >> I agree here. BDB seems a mature database; switching databases without
>> >> really isolating the culprit seems premature.
>> > 
>> > Bob's "deeper issues" are illusory; local configuration problems.
>> > 
>> > BDB uses 54MB when I have told it to use 20MB. That is the issue here.
>> > BDB is responsible for the majority of Fred's memory usage as of now as
>> > far as I can see.
>> 
>> But why? Can we be sure that the fault is not in some kind of misuse of
>> BDB instead of being intrinsic to BDB?
> 
> How to identify such misuse?

Memory profiling, I'd say. Though I have never done it with java.