HI
COM+ is a set of system services for application components while they are running. Therefore for load balancing purposes these should be set correctly. For BPC 7.5 on Windows 2008 they should be set to 5. OSOFT.DATASERVICE I believe is for data manager service and other things such as dimension processing ETC. Probably the developers only know what each COM+ component does for BPC. Or as the users are using the application you can view the COM+ in process explorer to see.
An example would be you have pools size of 1 that means the COM+ will create one DLLhost.exe in memory to handle ALL of the tasks that say EVDATASERVER evdataserver is requested to perform. One of those tasks is to retrieve and expansions to run Excel. When 4 entries referring to the "limit" are set to 0 that means that COM+ application will not automatically recycle itself, which is not a good idea.
You may want to take a look at MS on COM+ pooling to better understand.
COM+ (Component Services) (COM+)
COM+ Applications <Application> Properties Sheet: Pooling & Recycling Tab
Also for performance tuning you should visit SAP WIKI: BPC 7.5 and BPC 10 Best Practice Performance Tuning - Enterprise Performance Management - SCN Wiki
Hope this helps.
April
