4. EXCEPTIONS › 4.3 Detailed Exception Descriptions › 01500: IPU Underutilized

01500: IPU Underutilized

FILE: Individual Processor Activity File
SAS FILE NAME: DAYS.HARIPU01
SOURCE LOCATION: prefix.MICS.USER.SOURCE(DYRMFEXC)

SEVERITY: Warning              (SEVERITY='W')
MANAGEMENT AREA: Performance   (MGMTAREA='PERFORMANCE')

PURPOSE:  Detects an underutilized processor.

RATIONALE:  An underutilized processor may result from lack
of workload or may indicate poor performance.  When the
operating system is overcommitted (page faulting, I/O delays,
and so on), processor utilization may decrease because the
supervisor and workload are waiting unnecessarily.  Detection
of low processor utilization may identify periods of poor
performance, permitting further investigation of the critical
resources.

DEFINITION:  This exception is detected when a processor wait
percentage is above the installation-defined maximum.

EXCEPTION STATEMENTS:  The SAS statements identifying the
exception situation and describing the condition are stored
in the source member named in SOURCE LOCATION and are
described below.

***********************************;
*** 01500 *** IPU UNDERUTILIZED ***;
***********************************;
IF ((SYSID EQ 'sysid1' AND IPUPCWT GT percent1) OR
    (SYSID EQ 'sysid2' AND IPUPCWT GT percent2))
 THEN IF ((HOUR GE hh1 AND HOUR LE hh2) AND
          (DAYNAME NE 'SAT' AND DAYNAME NE 'SUN'))
  THEN DO;
    EXCCODE='01500'; SEVERITY='W'; MGMTAREA='PERFORMANCE';
    EXCDESC1='PROCESSOR UNIT UNDERUTILIZED';
    EXCDESC2='IPU ADDRESS=' !! PUT(IPUADDR,HEX2.) !!
           ', IPU WAIT=' !! PUT(IPUPCWT,5.1) !! '%';
    LINK HIT;
  END;


THRESHOLD MODIFICATION:  Modify the sysid, percent and prime
time values according to the following conventions:

sysid - Specifies a four-character CA MICS system ID.

percent - Specifies the maximum processor wait percent.

A 10 percent threshold for system GFL1 and a 20 percent
threshold for system GFL2 appears as:

IF ((SYSID EQ 'GFL1' AND IPUPCWT GT 10) OR
    (SYSID EQ 'GFL2' AND IPUPCWT GT 20))

prime time - Specifies the hour range and days of the week to
be included in the exception.  The hour of the day must be
within the hh1 through hh2 range.  The days of the week are
represented by the first three characters of their names.
Prime time specified as 8:00 am through 6:59 pm (18:59) on
weekdays only appears as:

IF ((HOUR GE 8 AND HOUR LE 18) AND
    (DAYNAME NE 'SAT' AND DAYNAME NE 'SUN'))

The time period to be included may already be defined by
means of the ZONE definition, which provides a simpler method
of selecting hours and days for processing.  If ZONE 1
corresponds to the desired time period, it appears as:

IF ZONE EQ '1'