B2b mds cache impacting bpel performance

Hi All,
We have xmx set to 4GB and we have set the b2b.mdsCache to 400 MB.
Our process runs as JMS --> B2B --> JMS --> Composite app(mediator and BPEL)--> OSB
In composite application in one of the step mediator publishes events to EDN.
Now when we dont have B2B MDS cache set to 400 MB, The composite process completes within a second
But when we have b2b mds cache in b2b-config.xml set to 400 MB then the composite app takes 20 sec to complete. when we analyzed this we found that mediator is taking 10 second to publish the even to EDN which inturn increasing the over all processing time as message is being published to END twice in this composite app.
Even subscribing to event is very slow almost 9 sec.
Env Details :
Soa 11.1.1.5 on linus 5.1, in dev mode with default settings
xms - xmx = 2GB - 4GB
We set the b2b.mdscache to 400 mb as per the Oracle doc as below:
A ratio of 5:1 is recommended for the xmx-to-mdsCache values. For example, if the xmx size is 1024, maintain mdsCache at 200 MB
Regards
SVS

Do you really have a huge B2B repository? What is the size of your entire B2B repository (export it to know the size)? What volume of messages do your B2B process in an hour during peak time?
We set the b2b.mdscache to 400 mb as per the Oracle doc as below:Please remember that these settings should be changed only when you see any issue related to performance. By default B2B assigns 200MB for MDS cache which is sufficient enough to handle fairly large configurations.
In composite application in one of the step mediator publishes events to EDN.Is your EDN JMS based or DB based?
But when we have b2b mds cache in b2b-config.xml set to 400 MB then the composite app takes 20 sec to complete.First of all, this property is set in the EM console. b2b-config.xml was used before 11.1.1.3. To understand that why EDN is taking 20 sec, take multiple thread dumps of your server while processing EDN message and also generate an AWR of your DB. This will give some idea that where delay is happening. Also monitor the heap usage and CPU usage during this processing.
Regards,
Anuj

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