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

[Jano]

Jano wrote:

> Matthew Toseland wrote:
> 
>> [B [I [C [[B almost certainly mean byte[], int[], char[], byte[][].
> 
> Good to know.
> 
>> I didn't get jmap to work (maybe because I was using java 5), but I did
>> do some invasive profiling (with stack traces), and used that to
>> identify and eliminate some high-churn objects; if the current problem is
>> that too much garbage collection is occurring (causing 100% cpu usage),
>> this is most likely caused by too many objects being allocated per
>> second.
> 
> FWIW, I have the OoM problem but not high CPU problems (see my graphs
> pending moderation).
> 
> Though, as the point of OoM gets closer, the JVM will attempt a full OoM
> each time it would run out of memory, so I'd say that in the final moments
> of a node, CPU churn due to GC will be very high (I'll try to capture
> these moments with jconsole, very nice tool).

It seems I was wrong. From the graphs I attach I'd say that the JVM didn't
attempted very aggresively to GC before signaling OoM. This was a node
configured with 256m. As you can see, CPU was never a big issue, and I had
around 50 insertions running. My cpu is a dual core 2.8GHz one.

I'm running now with 96m to see what happens...
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