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OpenVMS System Management Utilities Reference
Manual
MONITOR MSCP_SERVER
The MONITOR MSCP_SERVER command initiates monitoring of the mass
storage control protocol (MSCP) server class.
Format
MONITOR MSCP_SERVER
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
The MSCP server class consists of the following data items that can be
useful in tuning the MSCP server:
| Data Item |
Description |
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Server I/O Request Rate
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The rate at which remote processors request I/O transfers.
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Read Request Rate
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The rate at which remote processors request Read I/O transfers.
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Write Request Rate
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The rate at which remote processors request Write I/O transfers.
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Extra Fragment Rate
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The rate at which the server issues extra fragments. One or more extra
fragments are created when, due to buffering constraints, the MSCP
server issues multiple I/Os in order to fulfill a single I/O request.
For example, if the MSCP server breaks up a 64-block request into 4
fragments of 16 blocks, 3 extra fragments are created.
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Fragmented Request Rate
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The rate at which fragmented requests occur. A fragmented request is a
transfer request that the server fragments due to buffering
constraints. For example, one fragmented request occurs when the server
splits a 36-block request into 3 fragments of 16 blocks, 16 blocks, and
4 blocks. In this example, the server creates two extra fragments.
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Buffer Wait Rate
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The rate at which "buffer waits" occur in the server. A
buffer wait occurs when a request must wait for MSCP buffer memory.
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Request Size Rates
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A histogram that displays the rate of requests for various block sizes.
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Example
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MONITOR> MONITOR MSCP_SERVER
OpenVMS Monitor Utility
MSCP SERVER STATISTICS
on node GLOBBO
29-APR-2000 09:51:43
CUR AVE MIN MAX
Server I/O Request Rate 0.00 0.71 0.00 6.22
Read Request Rate 0.00 0.54 0.00 6.22
Write Request Rate 0.00 0.16 0.00 6.16
Extra Fragment Rate 0.00 0.00 0.00 0.00
Fragmented Request Rate 0.00 0.00 0.00 0.00
Buffer Wait Rate 0.00 0.00 0.00 0.00
Request Size Rates 1 0.00 0.07 0.00 0.98
(Blocks) 2-3 0.00 0.03 0.00 0.65
4-7 0.00 0.03 0.00 0.65
8-15 0.00 0.10 0.00 1.63
16-31 0.00 0.46 0.00 5.51
32-63 0.00 0.00 0.00 0.00
64+ 0.00 0.00 0.00 0.00
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This example demonstrates use of the MONITOR MSCP_SERVER command to
generate MSCP statistics on node GLOBBO.
MONITOR PAGE
The MONITOR PAGE command initiates monitoring of the PAGE class.
Format
MONITOR PAGE
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
The PAGE class includes the following data items:
| Data Item |
Description |
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Page Fault Rate
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Rate of page faults for all working sets
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Page Read Rate
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Rate of pages read from disk as a result of page faults
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Page Read I/O Rate
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Rate of read I/O operations from disk as a result of page faults
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Page Write Rate
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Rate at which pages were written to the page file
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Page Write I/O Rate
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Rate of write I/O operations to the page file
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Free List Fault Rate
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Rate at which pages were read from the free-page list as a result of
page faults
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Modified List Fault Rate
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Rate of pages read from the modified-page list as a result of page
faults
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Demand Zero Fault Rate
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Rate at which zero-filled pages were allocated as a result of page
faults
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Global Valid Fault Rate
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Rate of page faults for pages that are not in the process's working
set, but are in physical memory and are indicated as valid pages in the
systemwide global page tables
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Writes In Progress Fault Rate
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Rate of pages read that were in the process of being written back to
disk when faulted
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System Fault Rate
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Rate of page faults for pages in system space
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Free List Size
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Number of pages on the free-page list
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Modified List Size
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Number of pages on the modified-page list
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Example
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MONITOR> MONITOR PAGE
OpenVMS Monitor Utility
PAGE MANAGEMENT STATISTICS
on node SAMPLE
29-APR-2000 22:22:44
CUR AVE MIN MAX
Page Fault Rate 26.82 18.27 9.66 26.82
Page Read Rate 3.97 2.65 1.33 3.97
Page Read I/O Rate 1.32 0.99 0.66 1.32
Page Write Rate 0.00 0.00 0.00 0.00
Page Write I/O Rate 0.00 0.00 0.00 0.00
Free List Fault Rate 13.90 10.96 8.00 13.90
Modified List Fault Rate 5.62 2.99 0.33 5.62
Demand Zero Fault Rate 4.63 2.65 0.66 4.63
Global Valid Fault Rate 1.32 0.66 0.00 1.32
Wrt In Progress Fault Rate 0.00 0.00 0.00 0.00
System Fault Rate 2.31 1.99 1.66 2.31
Free List Size 3164.00 3176.00 3164.00 3188.00
Modified List Size 155.00 131.00 107.00 155.00
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This example shows that the current rate of pages read per read I/O
operation is approximately 3 per second (Page Read Rate divided by Page
Read I/O Rate). Note that while the page fault rate is currently at the
highest point of the monitoring session, the majority of the pages are
faulted from memory, not from disk.
MONITOR PROCESSES
The MONITOR PROCESSES command initiates monitoring of the PROCESSES
class, which displays information about all processes in the system.
In a multifile summary request, the classes CLUSTER and PROCESSES are
ignored. If these classes are the only classes specified on the command
line, MONITOR does not recognize them and displays a "no classes
specified" error message.
Format
MONITOR PROCESSES
Command Qualifiers
/qualifier[,...]
One or more qualifiers as described in the Command Qualifier
Descriptions section.
Classname Qualifiers
/TOPBIO
Specifies that a bar graph listing the top buffered I/O users be
produced instead of the standard display and summary output. Values are
expressed in units of buffered I/Os per second.
/TOPCPU
Specifies that a bar graph listing the top CPU time users be produced
instead of the standard display and summary output. Values are
expressed in units of clock ticks (10 milliseconds) per second.
Prior to OpenVMS Version 7.3, the MONITOR PROCESSES/TOPCPU display
showed only a maximum of 8 processes on one screen. In OpenVMS Version
7.3, the choice of which one of three screens is displayed is
determined by the number of CPUs on the system. (See the examples in
this section.)
/TOPDIO
Specifies that a bar graph listing the top direct I/O users be produced
instead of the standard display and summary output. Values are
expressed in units of direct I/Os per second.
/TOPFAULT
Specifies that a bar graph listing the top page faulting processes be
produced instead of the standard display and summary output. Values are
expressed in units of page faults per second.
/TOPRBS (VAX Only)
On OpenVMS VAX systems, specifies that a bar graph listing the top
balance slot faulting processes be produced instead of the standard
display and summary output. Values are expressed in units of balance
slot faults per second.
Description
As illustrated in the examples, the PROCESSES display (and summary)
formats are different from those of all other classes. The PROCESSES
display provides the following information:
| Data Item |
Description |
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PID
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Process identifier as assigned by the system, in hexadecimal
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STATE
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Process's scheduler state (see the description of the MONITOR STATES
command for an explanation and a tabular summary of the STATES codes)
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PRI
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Current (as opposed to base) priority of the process
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NAME
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Process name
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PAGES
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Number of shareable pages and total number of pages currently in use by
the process
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DIOCNT
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Cumulative direct I/O operations performed by the process since its
creation; not displayed if the process is swapped out
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FAULTS
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Cumulative page faults since the process was created; not displayed if
the process is swapped out
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CPU TIME
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Cumulative CPU time used by the process since its creation, in the
format
hours:minutes:seconds
; not displayed if the process is swapped out
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The top corners of the display contain the number of processes in the
system and the time in days, hours, minutes, and seconds since the
system was last booted. Processes that are swapped out are so noted.
If more processes are in the system than can be displayed on the
terminal screen at once, the display consists of multiple screens.
Screens are presented one at a time at intervals specified with the
/VIEWING_TIME qualifier. The five /TOP bar graph displays provide the
PID and process name of each of the top eight users.
As with the other bar graph displays, examples in the displays of top
users are rounded to the nearest whole number. Up to eight processes
with nonzero values are displayed. To be eligible for inclusion in the
list of top users, a process must be present and swapped in at the
beginning and end of the display interval. This eligibility requirement
also applies to the beginning and ending of the entire period covered
by a summary.
Note that only one of the displays of top users or the regular
PROCESSES display can be selected in a single MONITOR request.
Examples
| #1 |
MONITOR> MONITOR/INPUT=PROCS.DAT/INTERVAL=6 PROCESSES
Process Count: 20 OpenVMS Monitor Utility Uptime: 1 23:26:10
PROCESSES
on node SAMPLE
29-APR-2000 12:39:09
PID STATE PRI NAME PAGES DIOCNT FAULTS CPU TIME
00000081 HIB 16 SWAPPER 0/0 0 0 00:00:15.8
00000102 LEFO 4 SAMPLE1001 87/232 SWAPPED OUT
00000103 COM 4 SAMPLE1101 16/100 7127 51298 00:05:11.0
00000084 HIB 8 ERRFMT 64/174 2750 125 00:00:43.9
00000086 LEF 8 OPCOM 73/272 283 178 00:00:07.7
00000087 HIB 9 JOB_CONTROL 57/293 707 167 00:00:10.5
00000088 HIB 8 CONFIGURE 43/205 22 123 00:00:00.6
0000008A HIB 6 SYMBIONT_0001 5/56 50 617 00:03:15.1
0000008B HIB 8 JNLACP 75/580 15149 4922 00:21:51.1
0000008C HIB 8 NETACP 5/954 11 1057 00:25:06.8
0000008D HIB 5 EVL 7/56 44 34384 00:00:20.5
0000008E HIB 9 REMACP 5/54 13 107 00:00:01.3
00000112 COM 4 SAMPLE1601 45/111 13131 39992 00:06:39.1
0000011E CUR 9 SMITH 89/298 138 830 00:00:07.1
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This example illustrates a PROCESSES display generated from the input
file PROCS.DAT. One line is displayed for each process in the system.
This display shows current values only---average, minimum, and maximum
statistics are not available. Also for swapped-out processes, the words
SWAPPED OUT replace the three rightmost items, because those items are
not available for swapped-out processes. Because this example is a
playback request, the system uptime displayed is that of the system at
the time the MONITOR data was recorded.
Nondisplayable characters in process names are represented by periods.
| #2 |
MONITOR> MONITOR/INPUT=PROCS.DAT PROCESSES/TOPDIO
OpenVMS Monitor Utility
TOP DIRECT I/O RATE PROCESSES
on node SAMPLE
29-APR-2000 16:13:38
0 25 50 75 100
+ - - - - + - - - - + - - - - + - - - - -+
000000C7 SAMPLE0901 25 |**********
| | | | |
00000112 SAMPLE1601 17 |******
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00000102 SAMPLE1001 14 |*****
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00000103 SAMPLE1101 12 |****
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00000080 NULL 12 |****
| | | | |
0000011E SMITH 4 |*
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0000008C NETACP 1 |
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+ - - - - + - - - - + - - - - + - - - - -+
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This example shows that the process SAMPLE0901, with a rate of 25 per
second, was the top consumer of direct I/Os during the most recent
interval between displays.
| #3 |
MONITOR> MONITOR PROCESSES/TOPCPU
OpenVMS Monitor Utility
TOP CPU TIME PROCESSES
on node BRS004
5-JUN-2000 10:47:49.21
0 25 50 75 100
+ - - - - + - - - - + - - - - + - - - - -+
00000121 BATCH_36 6 **
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0000012A BATCH_45 6 **
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00000117 BATCH_26 6 **
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0000011D BATCH_32 5 **
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0000011A BATCH_29 5 **
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0000012B BATCH_46 5 **
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00000125 BATCH_40 5 **
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0000011F BATCH_34 5 **
+ - - - - + - - - - + - - - - + - - - - -+
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This example shows a MONITOR PROCESSES/TOPCPU screen display on a
single CPU system.
| #4 |
MONITOR> MONITOR PROCESSES/TOPCPU
OpenVMS Monitor Utility
TOP CPU TIME PROCESSES
on node BRS012
5-JUN-2000 10:48:39.38
0 25 50 75 100
+ - - - - + - - - - + - - - - + - - - - -+
0000012B BATCH_46 7 **
00000128 BATCH_43 6 **
0000012A BATCH_45 5 **
00000125 BATCH_40 5 **
00000123 BATCH_38 5 **
00000121 BATCH_36 5 **
00000129 BATCH_44 5 **
0000011F BATCH_34 5 **
0000011E BATCH_33 5 **
0000011D BATCH_32 5 **
00000117 BATCH_26 5 **
00000127 BATCH_42 5 **
00000120 BATCH_35 5 **
0000011B BATCH_30 5 **
00000119 BATCH_28 5 **
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This example shows s MONITOR PROCESSES/TOPCPU screen display on a
12-CPU system.
| #5 |
MONITOR> MONITOR PROCESSES/TOPCPU
OpenVMS Monitor Utility
TOP CPU TIME PROCESSES
on node BRS016
5-JUN-2000 10:51:10.89
0 25 50 75 100
+ - - - - + - - - - + - - - - + - - - - -+
00000127 BATCH_42 6 **
00000125 BATCH_40 6 **
00000124 BATCH_39 5 **
00000118 BATCH_27 5 **
00000129 BATCH_44 5 **
00000122 BATCH_37 5 **
00000120 BATCH_35 5 **
0000011F BATCH_34 5 **
0000011D BATCH_32 5 **
0000011C BATCH_31 5 **
00000119 BATCH_28 5 **
00000128 BATCH_43 5 **
00000123 BATCH_38 5 **
0000011B BATCH_30 4 *
0000012B BATCH_46 4 *
00000126 BATCH_41 4 *
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This example shows s MONITOR PROCESSES/TOPCPU screen display on a
16-CPU system.
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