Flow Map Manual

Selecting Objects
Flow Map Host
098935 Tandem Computers Incorporated 3–7
A THRESHOLD can be defined for any of the Flow Map objects by specifying numeric
values that will be compared against the counter values from the object. For example,
THRESHOLD PROGRAM
CPU-BUSY-TIME > 1000 NORATED
means that only PROGRAM objects that have a CPU-BUSY-TIME counter greater than
1 second (1000 milliseconds) will be included in the diagram and
THRESHOLD PROCESS
CPU-BUSY-TIME > 2
MESSAGES-RECEIVED > 100 NORATED
means that PROCESSes will only be included if their CPU-BUSY- TIME, expressed as
utilization (rated), has a value greater than 2% and their MESSAGES-RECEIVED
counter has a value greater than 100. The RATED/NORATED clause has different
meanings depending on the type of counter, and the default is RATED.
Database objects use a similar convention. For example,
THRESHOLD FILE
READS > 100 NORATED
means that FILE objects will only be generated when their total READS counter is
greater than 100 read I/O requests, and
THRESHOLD DISKFILE
DRIVER-INPUT-CALLS > 10 NORATED
means that DISKFILE objects will be generated when their total DRIVER-INPUT-
CALLS counter is greater than 10 calls.
Using THRESHOLD statements correctly ensures that the most appropriate entities
are selected for the diagram, but the same values cannot always be used. If the same
THRESHOLD values are used for TPDC samples taken at peak and off-peak periods, it
is likely that too many entities will be excluded in the off-peak sample and not enough
in the peak sample.
Empty Config Flow Map generates objects for all Programs, PROCESSes, FILEs, and DISKFILEs if no
selection statements are provided. No PROCESS Group or FILE Group objects are
generated. Large applications could have too many lower level objects such as
PROCESS and DISKFILE objects. To exclude them, use the statement
SET DISCARD YES
This discards all PROCESS and DISKFILE objects. This is also the default setting.