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HP OpenVMS System Management Utilities Reference
Manual
MONITOR SCS
The MONITOR SCS command initiates monitoring of the System
Communications Services (SCS) class.
Format
MONITOR SCS
Command Qualifiers
/qualifier[,...]
One or more qualifiers as described in the Command Qualifier
Descriptions section.
Classname Qualifiers
/ALL
Specifies that a table of all available statistics (current, average,
minimum, and maximum) is to be included in the display and summary
output. For summary output, this qualifier is the default for all
classes; otherwise, it is the default for all classes except CLUSTER,
MODES, PROCESSES, STATES, SYSTEM, and VECTOR.
/AVERAGE
Specifies that a bar graph of average statistics is to be included in
the display and summary outputs.
/CURRENT
Specifies that a bar graph of current statistics is to be included in
the display and summary outputs. The /CURRENT qualifier is the default
for the CLUSTER, MODES, STATES, SYSTEM, and VECTOR classes.
/ITEM=(keyword[,...])
Selects one or more data items for inclusion in display and summary
outputs. If you specify two or more keywords, enclose them in
parentheses, and separate them with commas. When the /ITEM qualifier is
omitted, the default is /ITEM=KB_MAP.
The following table describes /ITEM qualifier keywords:
| Keyword |
Description |
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ALL
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Specifies that statistics on all data items collected for the disks are
displayed on successive screens.
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BUFFER_DESCRIPTOR
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Specifies that statistics on the queued-for-buffer-descriptor (on the
local node) rate are displayed for each node.
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D_DISCARD
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Specifies that datagram discard rate statistics are displayed for each
node.
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D_RECEIVE
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Specifies that datagram receive rate statistics are displayed for each
node.
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D_SEND
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Specifies that datagram send rate statistics are displayed for each
node.
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KB_MAP
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Specifies that kilobyte map rate statistics are displayed for each node.
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KB_REQUEST
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Specifies that kilobyte request (via request datas) rate statistics are
displayed for each node.
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KB_SEND
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Specifies that kilobyte send (via send datas) rate statistics are
displayed for each node.
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M_RECEIVE
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Specifies that message receive rate statistics are displayed for each
node.
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M_SEND
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Specifies that message send rate statistics are displayed for each node.
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REQUEST_DATA
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Specifies that request data (initiated on the local node) rate
statistics are displayed for each node.
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SEND_CREDIT
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Specifies that queued-for-send-credit (on the local node) rate
statistics are displayed for each node.
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SEND_DATA
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Specifies that send data (initiated on the local node) rate statistics
are displayed for each node.
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/MAXIMUM
Specifies that a bar graph of maximum statistics is to be included in
the display and summary outputs.
/MINIMUM
Specifies that a bar graph of minimum statistics is to be included in
the display and summary outputs.
/PERCENT
/NOPERCENT (default)
Controls whether statistics are expressed as percent values in display
and summary outputs. The /PERCENT qualifier is applicable only to the
DISK, MODES, SCS, and STATES classes.
Description
The SCS class is a component class. Data items for this class are
collected for each node in the cluster. The SCS class consists of the
following data items:
| Data Item |
Description |
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Datagram Send Rate
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Rate at which datagrams are sent to another node.
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Datagram Receive Rate
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Rate at which datagrams are received from another node.
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Datagram Discard Rate
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Rate at which datagrams are discarded.
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Message Send Rate
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Rate at which sequenced messages are sent to another node. Sequenced
messages are exchanged between nodes to communicate with mass storage
control protocol (MSCP) disks and the lock manager.
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Message Receive Rate
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Rate at which sequenced messages are received from another node.
Sequenced messages are exchanged between nodes to communicate with MSCP
disks and the lock manager.
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Send Data Rate
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Rate at which block send datas are initiated on the local node.
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Kbytes Send Rate
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Rate at which kilobytes are sent, as a result of send datas initiated
on the local node.
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Request Data Rate
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Rate at which request datas are initiated on the local node.
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Kbytes Request Rate
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Rate at which kilobytes are received, as a result of request datas
initiated on the local node.
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Kbytes Map Rate
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Rate at which kilobytes are mapped for block transfers. This is a rough
measure of the data transfer rate between the local node and a remote
node. Before any transfer can take place, a buffer must be mapped. The
size of the accumulated buffers that were mapped is displayed by the
Kbytes Map Rate. If request datas or send datas are initiated on the
local or a remote node, then the Kbytes Map Rate reflects the number of
kilobytes actually transferred between the two nodes.
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Send Credit Queued Rate
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Rate at which connections are queued for a send credit. A connection is
queued for a send credit whenever all of the buffers that were
allocated by the remote node have been used.
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Buffer Descriptor Queued Rate
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Rate at which connections are queued for a buffer descriptor. A
connection is queued for a buffer descriptor whenever all of the buffer
descriptors have been allocated by the local node. You can increase the
number of buffer descriptors allocated on the local system by adjusting
the system parameter SCSBUFFCNT.
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Example
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MONITOR> MONITOR SCS
OpenVMS Monitor Utility
SCS STATISTICS
on node CURLEY
29-APR-2003 10:21:46
Kbytes Map Rate CUR AVE MIN MAX
CURLEY 0.00 0.00 0.00 0.00
MOE 0.00 0.00 0.00 0.00
LARRY 0.00 0.00 0.00 0.00
SHEMP 5.64 3.81 1.98 5.64
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The command in this example requests that kilobyte map rate statistics
collected for SCS be displayed for each node in the cluster. The
display shows block transfer map activity between the node CURLEY and
the hierarchical storage controller (HSC) SHEMP. Note that each node in
the cluster is identified by its SCS node name.
MONITOR STATES
The MONITOR STATES command initiates monitoring of the PROCESS STATES
class, which shows the number of processes in each of the 14 scheduler
states.
Format
MONITOR STATES
Command Qualifiers
/qualifier[,...]
One or more qualifiers as described in the Command Qualifier
Descriptions section.
Classname Qualifiers
/ALL
Specifies that a table of all available statistics (current, average,
minimum, and maximum) is to be included in the display and summary
output. For summary output, this qualifier is the default for all
classes; otherwise, it is the default for all classes except CLUSTER,
MODES, PROCESSES, STATES, SYSTEM, and VECTOR.
/AVERAGE
Specifies that a bar graph of average statistics is to be included in
the display and summary outputs.
/CURRENT
Specifies that a bar graph of current statistics is to be included in
the display and summary outputs. The /CURRENT qualifier is the default
for the CLUSTER, MODES, STATES, SYSTEM, and VECTOR classes.
/MAXIMUM
Specifies that a bar graph of maximum statistics is to be included in
the display and summary outputs.
/MINIMUM
Specifies that a bar graph of minimum statistics is to be included in
the display and summary outputs.
/PERCENT
/NOPERCENT (default)
Controls whether statistics are expressed as percent values in display
and summary outputs. The /PERCENT qualifier is applicable only to the
DISK, MODES, SCS, and STATES class names.
Description
The STATES class shows the number of processes in each of the 14
scheduler states. The following table describes these scheduler states:
| Scheduler State |
Description |
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Collided Page Wait (COLPG)
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Waiting for a faulted page in transition.
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Mutex & Miscellaneous Resource Wait (MWAIT)
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Waiting for the availability of a mutual exclusion semaphore or a
dynamic resource. The following table contains a summary of Mutex and
Miscellaneous Resource Wait states and identifying codes, as they
appear in the PROCESSES class display:
| MWAIT |
Reason for Wait |
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MUTEX
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Mutual exclusion semaphore
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RWAST
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AST wait (wait for system or special kernel AST)
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RWBRK
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Breakthrough (wait for broadcast message)
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RWCAP
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CPU capability required
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RWCLU
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Cluster state transition wait
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RWCSV
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Cluster server
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RWIMG
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Image activation lock
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RWLCK
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Lock database
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RWMBX
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Mailbox full
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RWMPB
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Modified page writer busy
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RWMPE
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Modified page list empty
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RWNPG
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Nonpaged dynamic memory
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RWPAG
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Paged dynamic memory
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RWPGF
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Page file full
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RWQUO
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Job quota
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RWSCS
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System Communications Services wait
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RWSNP
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System snapshot
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RWSWP
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Swap file space
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Common Event Flag Wait (CEF)
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Waiting for a combination of event flags to be set in a common event
block.
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Page Fault Wait (PFW)
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Waiting for a page to be read as a result of a page fault; resident
processes.
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Local Event Flag Wait (LEF)
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Waiting for one or more local event flags to be posted; resident
processes.
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Local Event Flag (Outswapped) (LEFO)
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Waiting for one or more local event flags to be posted; outswapped
processes.
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Hibernate (HIB)
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Hibernating, or process has executed a hibernate request; resident
processes.
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Hibernate (Outswapped) (HIBO)
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Hibernating, or process has executed a hibernate request; outswapped
processes.
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Suspended (SUSP)
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Process has executed a suspend request; resident processes.
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Suspended (Outswapped) (SUSPO)
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Process has executed a suspend request; outswapped processes.
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Free Page Wait (FPW)
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Waiting for a free page of memory.
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Compute (COM)
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Ready to use the processor; resident processes.
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Compute (Outswapped) (COMO)
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Ready to use the processor; outswapped processes.
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Current Process (CUR)
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Using the processor.
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The data items can also be displayed as percentages of all processes.
Note that the Current Process is always the process running MONITOR,
because MONITOR is running when each measurement is made.
For performance reasons, MONITOR does not synchronize the scanning of
process state data structures with operating system use of those
structures. It is therefore possible that MONITOR will display certain
anomalous state indications.
Example
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$ MONITOR/INPUT/SUMMARY/NODISPLAY -
_$/BEGINNING=29-APR-2003:13:00 -
_$/ENDING=29-APR-2003:14:00 STATES/PERCENT/ALL
$ TYPE MONITOR.SUM
OpenVMS Monitor Utility
PROCESS STATES (%)
on node SAMPLE From: 29-APR-2003 13:00:00
SUMMARY To: 29-APR-2003 14:00:00
CUR% AVE% MIN% MAX%
Collided Page Wait 0.0 0.0 0.0 0.0
Mutex & Misc Resource Wait 0.0 0.0 0.0 0.0
Common Event Flag Wait 0.0 0.0 0.0 0.0
Page Fault Wait 4.3 1.4 0.0 4.3
Local Event Flag Wait 34.7 31.7 34.7 42.8
Local Evt Flg (Outswapped) 0.0 9.0 0.0 19.4
Hibernate 43.4 40.7 43.4 52.1
Hibernate (Outswapped) 0.0 4.3 0.0 15.4
Suspended 0.0 0.0 0.0 0.0
Suspended (Outswapped) 0.0 0.0 0.0 0.0
Free Page Wait 0.0 0.0 0.0 0.0
Compute 13.0 7.3 4.3 13.0
Compute (Outswapped) 0.0 0.8 0.0 3.2
Current Process 1.0 1.0 1.0 1.0
PLAYBACK SUMMARIZING
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The commands in this example generate and display a PROCESS STATES
summary. Note that since use of the Return key is not permitted within
a single MONITOR command following the MONITOR> prompt, the MONITOR
command is entered at DCL level. The summary shows that, on the
average, 14.1 percent of processes were swapped out for the summarized
period. Note that the summary was requested for data covering only the
hour between 1 P.M. and 2 P.M., although the input file could have
contained data covering a longer period.
MONITOR SYSTEM
The MONITOR SYSTEM command initiates monitoring of the SYSTEM
statistics class, which shows several of the most important items from
other classes.
Format
MONITOR SYSTEM
Command Qualifiers
/qualifier[,...]
One or more qualifiers as described in the Command Qualifier
Descriptions section.
Classname Qualifiers
/ALL
Specifies that a table of all available statistics (current, average,
minimum, and maximum) is to be included in the display and summary
output. For summary output, this qualifier is the default for all
classes; otherwise, it is the default for all classes except CLUSTER,
MODES, PROCESSES, STATES, SYSTEM, and VECTOR.
/AVERAGE
Specifies that a bar graph of average statistics is to be included in
the display and summary outputs.
/CURRENT
Specifies that a bar graph of current statistics is to be included in
the display and summary outputs. The /CURRENT qualifier is the default
for the CLUSTER, MODES, STATES, SYSTEM, and VECTOR classes.
/MAXIMUM
Specifies that a bar graph of maximum statistics is to be included in
the display and summary outputs.
/MINIMUM
Specifies that a bar graph of minimum statistics is to be included in
the display and summary outputs.
Description
Because the SYSTEM class collects the most significant performance
statistics from other classes in a single display, it is particularly
useful to system managers and other users seeking a general overview of
system activity. The SYSTEM class includes the following data items:
Interrupt Stack (on VAX systems) or Interrupt State (on Alpha and I64
systems)
MP Synchronization
Kernel Mode
Executive Mode
Supervisor Mode
User Mode
Compatibility Mode (meaningful on VAX systems only)
Idle Time
Process Count
Page Fault Rate
Page Read I/O Rate
Free List Size
Modified List Size
Direct I/O Rate
Buffered I/O Rate
The following two display formats are provided, depending on the
classname qualifier specified:
- A tabular style format for the /ALL qualifier
- A bar graph style format for the /AVERAGE, /CURRENT, /MAXIMUM, and
/MINIMUM qualifiers
Examples of these formats are at the end of this section. Note that the
bar graph version of the SYSTEM class (shown in Example 2) contains the
following data, which differs from the tabular version:
- All of the CPU processor modes except Idle Time are summarized in
the CPU Busy segment.
- In the Page Fault segment, the page read I/O rate is indicated by a
vertical bar. The bar provides a visual estimate of the proportion of
the total page fault rate that caused read I/O operations (the hard
fault rate). The hard fault rate appears to the left of the bar.
- Four segments show the processes that are currently the top
consumers of CPU (since the last screen update), page faults, direct
I/Os, and buffered I/Os.
Beginning in OpenVMS Version 7.3, the following rate fields have
increased in the MONITOR SYSTEM bar graph screen display:
| Rate Name |
Old Rate |
New Rate |
|
Page Fault
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100
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500
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Hard Page Fault (vertical line on Page Fault display)
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100
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500
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Direct I/O
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60
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500
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Free List Size
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Shown in K blocks
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Shown in K, M, or G blocks (whichever is appropriate)
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Mod (modified) List Size
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5 digits; K blocks
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8 digits; K, M, or G blocks (whichever is appropriate)
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Buffered I/O
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150
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500
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Any process that MONITOR designates as a top user process must be
swapped in at the beginning and ending of the display interval or at
the beginning and ending of the entire period covered by a summary.
When the lower bar graph (top user) and the corresponding upper bar
graph (overall system measure) are tracking the same statistic for the
same interval (as in Example 2), it is reasonable to compare the two
graphs. This will be the case in the following situation:
- SYSTEM is the only class being monitored (no other class names have
been specified with the MONITOR command).
- The CURRENT statistic is specified.
- The /INTERVAL and /VIEWING_TIME values are equal.
Otherwise, exercise care in making such comparisons because the top
user statistic is always CURRENT, while the overall system measure
statistic may be CURRENT, AVERAGE, MAXIMUM, or MINIMUM.
Rates for top users are calculated based on the interval between two
successive screen displays, while overall system rates are based on the
collection interval. These two interval values can be different
whenever one or more classes are being monitored with the SYSTEM class,
or when /INTERVAL and /VIEWING_TIME values differ.
While other upper boundary figures for the SYSTEM class bar graphs are
constants, the figures for Free List Size and Modified List Size are
derived from the physical memory configuration and system parameters of
individual systems. The upper boundary figure for the Free List is the
number of pages available after deducting the pages permanently
allocated to the operating system. This figure, sometimes referred to
as balance set memory, is the number of pages that can
be allocated to processes, the Free List, and the Modified List. The
upper boundary figure for the Modified List is the value of the
MPW_HILIMIT system parameter. Note that both upper boundary figures are
calculated when the MONITOR request is initiated and do not change
thereafter.
Examples
| #1 |
MONITOR> MONITOR SYSTEM/ALL
OpenVMS Monitor Utility
SYSTEM STATISTICS
on node SAMPLE
29-APR-2003 12:43:28
CUR AVE MIN MAX
Interrupt Stack 0.33 0.33 0.33 0.33
MP Synchronization 0.00 0.00 0.00 0.00
Kernel Mode 0.16 0.16 0.16 0.16
Executive Mode 0.00 0.00 0.00 0.00
Supervisor Mode 0.00 0.00 0.00 0.00
User Mode 0.50 0.49 0.50 0.50
Compatibility Mode 0.00 0.00 0.00 0.00
Idle Time 99.00 98.67 99.00 99.00
Process Count 14.00 14.00 14.00 14.00
Page Fault Rate 0.33 0.33 0.33 0.33
Page Read I/O Rate 0.00 0.00 0.00 0.00
Free List Size 4255.00 4255.00 4255.00 4255.00
Modified List Size 105.00 105.00 105.00 105.00
Direct I/O Rate 0.00 0.00 0.00 0.00
Buffered I/O Rate 0.16 0.16 0.16 0.16
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This example shows the tabular style format for the SYSTEM display.
| #2 |
MONITOR> MONITOR SYSTEM
Node: BRS004 OpenVMS Monitor Utility 5-JUN-2003 10:45:32
Statistic: CURRENT SYSTEM STATISTICS
Process States
+ CPU Busy (400) -+ LEF: 15 LEFO: 0
|**************************| HIB: 14 HIBO: 0
CPU 0 +--------------------------+ 400 COM: 8 COMO: 0
|* | PFW: 0 Other: 1
+--------------------------+ MWAIT: 0
Cur Top: BATCH_27 (6) Total: 38
+ Page Fault Rate (1438) -+ + Free List Size (35173) +
|****|*********************| |**************** | 54K
MEMORY 0 +--------------------------+ 500 0 +--------------------------+
|**** | |************* | 5765
+--------------------------+ + Mod List Size (3078) +
Cur Top: BATCH_29 (78)
+ Direct I/O Rate (442) -+ + Buffered I/O Rate (112) -+
|********************** | |***** |
I/O 0 +--------------------------+ 500 0 +--------------------------+ 500
|* | | |
+--------------------------+ +--------------------------+
Cur Top: BATCH_24 (23) Cur Top: BATCH_24 (6)
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