Re: [aspectj-users] Memory consumption problems

["Eric Bodden" <eric.bodden@xxxxxxxxxxxxxx>]

Ashley, from your numbers the memory consumption seems to be pretty
steady, actually, doesn't it? It certainly isn't growing. so maybe you
should use a profiler to figure out where the memory is actually
consumed. It might just be due to a bug in your implementation. In
general I am very sure that your assumptions about percflow are
correct.

It may also depend on how you measure memory consumption. Up until now
I have found no really reliable way to measure memory consumption in
Java, even if you manually call the garbage collector etc.

Eric

2008/7/25 Ashley Williams <ashley.williams@xxxxxx>:
>
> Hi,
>
> We were looking forward to going to production with our profiling aspect
> however when we ran our app through jmap we got the chart pasted below. So
> it looks like some aspectj objects are responsible for a sizable share of
> memory. Without knowing more about them and if they will consume more memory
> with time, we can't proceed any further.
>
> The aspect we have created contains a stopwatch implementation and a logger
> and its cardinality is percflow so we get one per service method call on our
> server. I was under the impression though that as soon as the method call is
> finished any aspectj resources associated are eligable for garbage
> collection.
>
> I would appreciate it if somebody could shed some light on this.
>
> Cheers
> - Ashley Williams
>
> Size                 Count    Class
>
> 163466352       2149652 char[]
> 102393424       609786  byte[]
> 92017240        2300431 java.lang.String
> 43706328        114013  java.lang.Object[]
> 38792736        808182  java.util.HashMap$Entry
> 32742008        201623  int[]
> 32662680        269046  java.util.HashMap$Entry[]
> 31770768        234338  * ConstMethodKlass
> 26740224        417816  java.util.TreeMap$Entry
> 24387008        762094  org.aspectj.apache.bcel.classfile.ConstantUtf8
> 24380640        234338  * MethodKlass
> 18097728        188518  org.jboss.jms.message.JBossObjectMessage
> 17139712        267808  java.util.HashMap
> 16629528        13554   * ConstantPoolKlass
> 16087896        182817  org.aspectj.apache.bcel.classfile.Method
> 15182816        172532  org.aspectj.apache.bcel.classfile.Code
> 14216368        402768  org.aspectj.apache.bcel.classfile.Attribute[]
> 12472208        82054   java.lang.reflect.Method
> 11550800        13554   * InstanceKlassKlass
> 10796824        8196    org.aspectj.apache.bcel.classfile.Constant[]
> 10261296        199361  * SymbolKlass
> ---
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-- 
Eric Bodden
Sable Research Group
McGill University, Montréal, Canada