4. EXCEPTIONS › 4.3 Detailed Exception Descriptions › 01501: IPU Overutilized

01501: IPU Overutilized

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

SEVERITY: Impacting            (SEVERITY='I')
MANAGEMENT AREA: Performance   (MGMTAREA='PERFORMANCE')

PURPOSE:  Detects an overutilized processor.

RATIONALE:  An overcommitted processor may cause performance
degradation.  One school of thought suggests that a processor
operating at greater than a 98% busy rate may be indicative
of a performance problem.  It should be pointed out, however,
that a well-tuned system with a good I/O configuration (that
is, separation of channels, devices, control units, and so
on) and sufficiently fast DASD to handle paging and other I/O
demands, may well run at 95-100% for prolonged periods.

DEFINITION:  This exception is detected when a processor
utilization 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:

**********************************;
*** 01501 *** IPU OVERUTILIZED ***;
**********************************;
IF ((SYSID EQ 'sysid1' AND IPUPCBS GT percent1) OR
    (SYSID EQ 'sysid2' AND IPUPCBS GT percent2))
 THEN IF ((HOUR GE hh1 AND HOUR LE hh2) AND
          (DAYNAME NE 'SAT' AND DAYNAME NE 'SUN'))
  THEN DO;
    EXCCODE='01501'; SEVERITY='I'; MGMTAREA='PERFORMANCE';
    EXCDESC1='PROCESSOR UNIT OVERUTILIZED';
    EXCDESC2='IPU ADDRESS=' !! PUT(IPUADDR,HEX2.) !!
           ', IPU BUSY=' !! PUT(IPUPCBS,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 busy percent.

A 90 percent threshold for system ID GFL1 and a 95 percent
threshold for system ID GFL2 appears as:

IF ((SYSID EQ 'GFL1' AND IPUPCBS GT 90) OR
    (SYSID EQ 'GFL2' AND IPUPCBS GT 95))

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'