On 23.04.2008 20:56, Bruce Atherton wrote:
Here are some specifics, in case they are relevant. One heap analysis
showed 1.5 Gigabytes of memory being held by the object at the end of
this tree (package names suppressed to keep this readable):
- ScriptableObject
- FOM_Cocoon
- FOM_Cocoon$CallContext
- ConcreteTreeProcessor
- InvokeContext
- CachingProcessorPipeline
- ArrayList
- Object
- ComponentsSelector
- ComponentsSelector
- Collections$SynchronizedMap
- HashMap
- Array of HashMap$Entry
- HashMap$Entry (size including children =
1.5Gig)
How do I read this? I tried to reproduce it in the code but it does not
make sense to me. FOM_Cocoon$CallContext has no reference to the
ConcreteTreeProcessor or the other way around. Object can neither have a
reference to ArrayList or ComponentsSelector. So what does it mean?
That HashMap$Entry object had the following child tree, each one a bit
smaller than its parent. Only the largest child shown at each level:
- HashMap$Entry (a different one)
- TraxTransformer
- TransformerHandlerImpl
- SAXResult
- JxTemplateTransformer
- JxTemplateGenerator$TranformerAdapter$TemplateConsumer
After this there are two JxTemplateGenerators that split the size. The
bigger one goes to FormsTemplateTransformer, CIncludeTransformer, and on
and on into a long loop of JxTemplateGenerator$StartElement and
JxTemplateGenerator$EndElement.
Do you run into the OOME just by one request or only after certain
number of requests since the content is stored "somewhere"?
It seems to me that it should be possible to put a limiter on the
transformers that says that if more than a certain volume of data is put
through, an exception is thrown. I know that part of the page may have
been rendered before the error page shows up, but I am fine with that.
I'd be happy to limit each part of the pipeline to outputting no more
than 10Meg.
Does it mean you want to flush the OutputStream after certain amount of
data? What about [1] and [2]?
Joerg
[1] https://issues.apache.org/jira/browse/COCOON-2168
[2] http://marc.info/?l=xml-cocoon-dev&m=120477640924395&w=4
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