Re: [aspectj-users] LTW is using high heap memory

["Jayarajan, Divya" <Divya.Jayarajan@xxxxxxx>]

Hi Andy,

Thanks for your reply.
I am using the AspectJ version 1.6.11. Normally my application takes 4MB of memory but when I implemented  AspectJ the memory spiked to 760MB on start up and then came down to 60MB.On further analysis it's found that I was calling groovy code in Aspect which was the reason for eating up all the memory.When I replaced those groovy code with Java,there is drastic drop in memory usage,which  remained at 60MB even on start up.
So please help me understand why this groovy is the reason for shooting up the memory. I am not using ITDs but only advices.Is it normal that Aspect will take 60MB than the normal use of 4MB.Can I reduce it further if I use the latest version.i.e, 1.6.12.

Thanks in advance,
Divya

-----Original Message-----
From: aspectj-users-bounces@xxxxxxxxxxx [mailto:aspectj-users-bounces@xxxxxxxxxxx] On Behalf Of Andy Clement
Sent: Wednesday, December 14, 2011 9:50 PM
To: aspectj-users@xxxxxxxxxxx
Subject: Re: [aspectj-users] LTW is using high heap memory

Hi,

First, make sure you are on a recent AspectJ - you don't mention which
version.  As per
http://www.eclipse.org/aspectj/doc/released/README-167.html (see the
memory graphs in there) - you want to be on something later than
1.6.6, preferably 1.6.12.

Memory will spike at startup as 'stuff' is woven but over time it will
reduce as many things are only held by weak/soft refs - how those end
up being collected, well you are at the mercy of how your chosen JVM
is going to treat them, so it may take a number of GCs before the
memory is recovered.

Right now the only types permanently held onto by the weaver (so not
linked by weak/soft refs) are aspects and types affected by ITDs, are
you doing ITDs or just advice?

There is a work item to have a weaver go to 'sleep' on disk and
reinflate when required, but I haven't gotten around to doing that
work yet.

cheers,
Andy


On 13 December 2011 21:51, Jayarajan, Divya <Divya.Jayarajan@xxxxxxx> wrote:
> Hi,
>
> I have written a .aj class for intercepting some methods of my
> application.This works fine but I have observed that there is a large heap
> memory consumption during the startup of the application after adding the
> .aj class.If I remove the .aj class and restart the application, heap memory
> consumption is normal (of-course I will not be able to execute intercepting
> logic).I'm using loadtime weaving.
>
> I'm not able to figure out why there is so much memory needed at the
> startup.Increasing the heap memory is not an option.
>
> Please suggest what can be done.
>
> Many Thanks,
> Divya
>
>
>
> _______________________________________________
> aspectj-users mailing list
> aspectj-users@xxxxxxxxxxx
> https://dev.eclipse.org/mailman/listinfo/aspectj-users
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