Performance Tuning D6

October 17, 2007 at 7:56 am | Posted in D6, Momentum, Performance, Xense Profiler | Leave a comment

One of the big changes in Documentum 6 is that DFC is no longer reliant on DMCL to talk to the Content Server. In versions of DFC prior to D6, native code DMCL (a Windows DLL or a Unix shared library) was bound into the DFC process space and DFC would call DMCL functions via JNI. DMCL in turn would execute RPC calls to the Content Server functions. In D6 this whole function chain is now implemented in Java effectively replacing native-code DMCL with Java equivalents.

There are some significant consequences of this change. DMCL.ini is no longer used to set set client parameters such as docbroker host and port, etc. There are now equivalent dfc.properties keys. In fact EMC has taken the opportunity to rationalise the naming of DFC keys thoughout. This is documented in a number of places but the most useful is the Documentum 6 System Migration Guide.

The other big change is that there is no DMCL trace facility. This has a big effect on the performance tuning methodology, which for a decade has usually started with running a DMCL trace. The clear replacement for this is the DFC trace which has undergone some changes since version 5.3. I will be presenting at Momentum on the topic of DFC trace and its use in performance tuning D6. If you are currently implementing D6 or will be soon then you will want to get to grips with the significant change in approach. The talk will include some of the reports generated from the Xense Profiler for D6 which is currently under development.

Update 26 April 2006: The beta for Xense Profiler for DFC is now available for download free of charge.

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