5. FILES › 5.2 WEB Information Area (WEB) Files › 5.2.11 Web Request CPU Breakdown File (WEBWCB) › 5.2.13.3 WEBWCB Usage Considerations

5.2.13.3 WEBWCB Usage Considerations

 
 The WEBWCB file is derived from SMF type 120 subtype 09
 records, CPU usage breakdown section.  The CPU usage
 breakdown section is not activated by default.  Typically the
 breakdown section is activated for a sort time and focused on
 web request activity that required special study, as there is
 some overhead in collecting the information.
 
 When the web request application calls another web part that
 requires the web container or EJB container, Websphere can
 gather the usage metrics for each of these parts.  Usage on
 up to 30 of these called parts can be recorded for the web
 request.
 
 If you study the WCB file for particular web requests, you
 will be able to determine which parts of the application are
 consuming the most CPU.  You will also be able to identify
 the AMC (Application/Module/Component) or web application
 name, and the method or servlet name used by each part of the
 web request.
 
 Most of the information needed for analysis is in the WCB
 file.  However, if you need other information from the other
 files populated from the SMF 120 subtype 9 record, you can
 merge the files by SYSID and WEBCY (enclave token) to
 correlate the data.