HP OpenVMS Systemsask the wizard 
The Question is: Why is Working Set value from $SHOW PROC/CONT different from F$GETJPI(xxx,"WSSIZE") for the same process? The Answer is : This is a terminology issue. The F$GETJPI item WSSIZE is the working set size  or, more precisely, the working set CAPACITY  the maximum number of pages which could be contained in the current working set, without expansion. The field "Working Set" displayed by SHOW PROCESS/CONTINUOUS gives the actual number of pages currently contained in the working set. Typically this will be less than WSSIZE. You can derive the figure displayed SHOW PROCESS/CONTINUOUS as the sum of the F$GETJPI items PPGCNT and GPGCNT.
