HP 3000 Manuals

HP GlancePlus User's Manual (for MPE/iX Systems)

Memory Detail Screen 

The Memory Detail screen displays metrics that show physical memory
activity by the system during the current interval.  The detailed data
area of the display is divided into two parts:

   *   Fault Types.

   *   Miscellaneous.


          Figure 5-23.  Memory Detail Screen 

Fault Types 

The Fault Types section presents several metrics for memory faults
(faults per second).  [Scale:  0 to 50 faults per second.]


          Figure 5-24.  Memory Detail Screen--Fault Types 

The Fault Types are as follows:

Transient      Unspecified transient data objects.

Permanent      Unspecified permanent data objects.

NM Stack       Native Mode process stacks.

CM Stack       Compatibility Mode process stacks.

NM Code        Native Mode code.

CM Code        Compatibility Mode code (program files).

CM Data        Compatibility Mode data segment.

File Object    File Objects.

NM System      Native Mode system library.
Library

CM System      Compatibility Mode system library.
Library

Miscellaneous 

The Miscellaneous section presents several system memory performance
metrics that could be used to indicate potential memory bottlenecks.  A
bottleneck occurs when a memory resource has reached its capacity limit
and might slow system throughput or response time.


          Figure 5-25.  Memory Detail Screen--Miscellaneous Metrics 

MemMgr             Memory Manager utilization during the
                   current time interval is shown on the bar
                   and by percentage to the right of this
                   field.  Sustained utilization of 8% or
                   greater may indicate a potential memory
                   bottleneck.

Page Overlay       This metric, depicted as the number of
Candidate Rate     potential free pages per second, shows the
                   Memory Manager activity on the making of
                   physical memory pages as Overlay candidates
                   (potential free pages).  A sustained rate
                   greater than 35 free pages per second may
                   indicate a memory bottleneck.

          Table 5-2.  (cont.) 

Memory Mgr         The bottom line of the Memory Detail screen
Clock Cycle Rate   shows the memory manager clock cycle rate.

                   The clock cycle rate is computed by dividing
                   the number of times the memory manager has
                   cycled through memory by the elapsed time
                   GlancePlus has been running.  Unlike the
                   other metrics on the screen, this one is
                   relative to the run time of GlancePlus
                   rather than the current interval.  This
                   avoids the misrepresentation of reporting
                   one clock cycle over four thirty-second
                   intervals as a rate of 120 per second during
                   one interval and 0 per second during the
                   other three.  It also means that you should
                   be careful to let GlancePlus run a few
                   minutes before drawing any conclusions from
                   this metric.

                   A memory manager clock cycle rate of more
                   than 25 per hour over ten minutes or more
                   may indicate possible memory pressure.

Page Fault Rate    This field shows the sum of the Global
                   System Page Fault types.  The sum is
                   expressed in page faults per second.  A
                   fault rate greater than 30 faults per second
                   sustained over several intervals may
                   indicate a potential bottleneck.

System Library     This metric shows the total Native Mode and
Page Faults        Compatibility Mode system library faults.  A
                   sustained rate of greater than 2 faults per
                   second may indicate a memory bottleneck
                   condition.

Physical Memory    This metric indicates the size of the
Size               machine's physical memory (in megabytes).

MPE/iX 5.0 Documentation