struts-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Leon Rosenberg" <rosenberg.l...@googlemail.com>
Subject Re: [OT] A question on garbage collecting
Date Wed, 02 Aug 2006 12:17:27 GMT
Thank you Tamas,

On 8/2/06, Tamas Szabo <szabtam@gmail.com> wrote:
> Hi Leon,
>
> I doubt I have more experience :-) but as I know soft references are
> collected when the GC decides to do so.
>
> The only thing you can be sure of is that they will be collected _if_ the VM
> is running out of memory.
> But there is no guarantee that they will not be collected before.
>
> You are right, it is weird because you usually use them for caches but, I
> guess that it is VM-implementation specific.
> Maybe if you use another VM, or try to find some help from your VM providers

Heh, getting help from sun? I think it's a myth!!! My best friends
girlfriend works for storagetek which now belongs to sun, and even
they don't get support.

regards
Leon


> :-)
>
> Tamas
>
>
> On 8/2/06, Leon Rosenberg <rosenberg.leon@googlemail.com> wrote:
> >
> > Hi,
> >
> > I have a question regarding a weird behaviour of the garbage
> > collector, maybe someone here, has more experience with it, and can
> > answer the question. Otherwise sorry for the OT.
> >
> > We have a cache for caching 1000.000 user objects along with many
> > (some hundred thousand) not existing objects (negative cachingto
> > prevent db requests). The cache is an array of softreferences to the
> > objects. We used softreferences to prevent oome in case we don'T have
> > enough ram. However now we do have enough ram - 6 Gb assigned to the
> > java process, and System.freeMemory is always above 1 gig.
> >
> > However, I see that through the cache isn't full yet, and there is
> > plenty of free memory, 500.000 objects have been garbage collected.
> >
> > Could it be that softreference are collected independent of available
> > memory? If true, isn't it weird? ;-(
> >
> > regards
> > Leon
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> > For additional commands, e-mail: user-help@struts.apache.org
> >
> >
>
>

---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
For additional commands, e-mail: user-help@struts.apache.org


Mime
View raw message