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Date: Tue, 9 Aug 2011 13:41:18 -0700 (PDT)
From: kjagadeeshkumar <kjagadeeshkumar@gmail.com>
To: users@activemq.apache.org
Message-ID: <1312922478011-3731194.post@n4.nabble.com>
Subject: 5.4.2 : [Lorg.apache.activemq.command.DataStructure
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Hi All, 
Recently we upgraded to AMQ5.4.2 and jmap histo on the broker shows that the
Array of  DataStructure objects is using more than 75% of total heap, with
each instance weighing around 52-55K(in prod). 

 num     #instances         #bytes  class name 
 1:         12054      656514208 
[Lorg.apache.activemq.command.DataStructure; 

Each array is so huge and contains about 16383 DataStructure objects. 
In the OpenWireFormat , i see the below two. MARSHAL_CACHE_SIZE is
Short.MAX_VALUE / 2;

    private DataStructure marshallCache[] = new
DataStructure[MARSHAL_CACHE_SIZE];
    private DataStructure unmarshallCache[] = new
DataStructure[MARSHAL_CACHE_SIZE];

Though this piece of code is same in AMQ 5.2, we see it there only 1024
objects in the array and the array size is just about  4K or so.

Help me out. 

Thanks in advance. 

-jagadeesh- 


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