HP OpenVMS Systems Documentation
HP OpenVMS System Management Utilities Reference Manual
Displays information about transaction logs.
SHOW LOG [filespec]
MONITOR [/qualifier[,...]] classname[,...] [/qualifier[,...]]
Regardless of the order in which you specify classname parameters, MONITOR always executes requests in the following sequence:
Depending on the command qualifiers specified, MONITOR collects system performance data from the running system or plays back data recorded previously in a recording file. When you play back data, you can display it, summarize it, and even rerecord it to reduce the amount of data in the recording file.
16.2 MONITOR Usage Summary
The Monitor utility (MONITOR) is a system management tool that enables
you to obtain information about operating system performance.
Issuing the MONITOR command from the DCL prompt invokes the Monitor utility and allows you to use any of the Monitor utility commands as follows:
$ MONITOR MONITOR>
To begin monitoring a system, issue the Monitor utility MONITOR command.
If you attempt to monitor a remote node that is incompatible, the system displays the following message:
%MONITOR-E-SRVMISMATCH, MONITOR server on remote node is an incompatible version
If you receive this message, contact your HP support representative for a remedial kit that corrects this problem.
Before you install the remedial kit, you can still use MONITOR to obtain data about the remote node. To do this, record the data on the remote node, and then run the MONITOR playback feature to examine the data on the local node.
Generally, each MONITOR request runs until the time specified or implied by the /ENDING qualifier. To exit from MONITOR, enter the EXIT command at the MONITOR> prompt or press Ctrl/Z. To terminate a MONITOR request without exiting from the utility, press Ctrl/C.
Information that MONITOR collect is usually displayed as ASCII screen images. You can use the optional /DISPLAY qualifier to specify a disk file to contain the information. If you omit the file specification, output is directed to SYS$OUTPUT. See the Monitor utility MONITOR command for a discussion of the /DISPLAY qualifier.
You can also initiate MONITOR requests from command level by entering the DCL command MONITOR with the desired qualifiers and parameters. However, in terms of conserving system resources, it is preferable to initiate requests in response to the MONITOR> prompt.
This section describes and provides examples of MONITOR commands. For commands that specify classname parameters (other than ALL_CLASSES), a sample display or summary of each class is provided, with a brief description of the items in the class.
MONITOR recognizes the exclamation point (!) as a comment character. Thus, full- or partial-line comments are acceptable in command files specified as input to MONITOR.
Note that in MONITOR, rate indicates the number of occurrences per second. For example, the Page Fault rate indicates the number of page faults per second.
The following table lists the commands described in this section:
|ALIGN||On Integrity server systems, displays information about alignment faults.|
|CONVERT||Converts a pre-Version 5.0 MONITOR recording file to the current format.|
|EXECUTE (@)||Executes a series of MONITOR commands contained in a file.|
|EXIT||Terminates MONITOR, returning control to command level.|
|HELP||Displays information about MONITOR.|
|INITIALIZE||Reestablishes initial default dettings for parameters and qualifiers altered by the SET DEFAULT command.|
|MONITOR||Initiates monitoring of statistics for the classes of information you specify.|
|SET DEFAULT||Sets command qualifier, classname parameter, and classname qualifier defaults for the MONITOR command.|
|SHOW DEFAULT||Displays the defaults established by the SET DEFAULT command.|
On Integrity server systems, the ALIGN command displays information about alignment faults, thereby helping troubleshoot HP Integrity server systems.
The MONITOR ALIGN class displays a rate of alignment faults for each mode (kernel, executive, supervisor and user), along with the total alignment faults per second. If the alignment fault rate is very high, HP recommends that you use the Alignment Fault Utility (FLT) to analyze the cause of the alignment faults.
On Integrity server systems, the operating system handles all alignment faults. Therefore, you can increment counters to track the alignment fault rate. On Alpha systems, PALcode in the console corrects alignment faults. Therefore, you cannot tick counters without incurring much overhead. For this reason, the MONITOR command ALIGN is available only on Integrity servers.
This example shows the alignment fault rate on the current system.
The CONVERT command converts a pre-Version 5.0 MONITOR recording file to the current format.
file-specSpecifies the file to be converted. The default file specification is MONITOR.DAT.
/OUTPUTThe file specification of the converted file. The default specification is MONITOR.DAT.
You must convert pre-Version 5.0 recording files to the current format before attempting to play them back with the current MONITOR version.
MONITOR> CONVERT 24MAY_MONITOR.DAT/OUTPUT=24MAY_NEWMON.DAT
This command converts the file 24MAY_MONITOR.DAT to the current format and names the output file 24MAY_NEWMON.DAT.
The EXECUTE command or the at sign (@) executes a series of MONITOR commands contained in a file.
EXECUTE (@) file-spec
file-specSpecifies a command file to be executed by the EXECUTE (@) command.
With the EXECUTE command, you can direct MONITOR to obtain command input from a specified file rather than from the terminal. The file can contain any valid MONITOR command except an EXECUTE (@) command. Commands in the file are executed sequentially. If you omit the optional file specification, the default is MONITOR.MON.
After the file has executed, subsequent commands are obtained from the terminal.
MONITOR> EXECUTE INQMEM.MON . . . MONITOR> MONITOR /RECORD
Contents of the file INQMEM.MON are as follows:
! This file sets defaults for a memory management inquiry using ! INTERVAL=5, PAGE, IO, and PROCESSES/TOPFAULT ! . . . SET DEFAULT /INTERVAL=5 PAGE, IO, PROCESSES/TOPFAULT
In this example, appropriate default values for a memory management investigation are established in the file INQMEM.MON, and the file is executed with the EXECUTE command. Then a subsequent MONITOR command uses those defaults, adding the /RECORD qualifier, to display and record the selected classes with a 5-second interval.
Note that the defaults established when the file INQMEM.MON is executed remain in effect until changed explicitly or until you exit from the utility.
The EXIT command terminates MONITOR, returning control to command level.
The HELP command displays information about MONITOR.
commandSpecifies the name of a MONITOR command for which HELP is desired.
MONITOR> HELP MONITOR INITIALIZE The INITIALIZE command reestablishes initial default settings for parameters and qualifiers previously altered by the SET DEFAULT command.
The command in this example requests help information about the INITIALIZE command.
The INITIALIZE command reestablishes initial default settings for parameters and qualifiers altered by the SET DEFAULT command.
The MONITOR command initiates monitoring of statistics for the classes of information you specify.
MONITOR [/command qualifier[,...]] classname[,...] [/classname qualifier[,...]]
This section describes qualifiers for the MONITOR and SET DEFAULT commands. Note that these commands accept the same qualifiers. As these qualifiers follow the standard rules of DCL grammar as specified in the HP OpenVMS DCL Dictionary, you can abbreviate any qualifier or keyword as long as the abbreviation is not ambiguous. Use the asterisk (*) and the percent sign (%) as wildcard characters unless otherwise noted.
classname[,...]Specifies the class of performance data to be monitored. To monitor all classes, specify the ALL_CLASSES parameter. When you specify several classes, separate the classname parameters with commas or plus signs. You cannot specify the CLUSTER class name with any other class name. Cluster monitoring functions require that DECnet for OpenVMS be installed.
You must specify one or more of the following parameters:
Parameter Description ALL_CLASSES Statistics for all classes CLUSTER Clusterwide performance statistics DECNET DECnet for OpenVMS statistics DISK Disk I/O statistics DLOCK Distributed lock management statistics FCP File control primitive statistics FILE_SYSTEM_CACHE File system cache statistics IO System I/O statistics LOCK Lock management statistics MODES Time spent in each of the processor modes MSCP_SERVER MSCP server statistics PAGE Page management statistics PROCESSES Statistics on all processes RLOCK Dynamic lock remastering statistics RMS Record Management Services statistics SCS System Communications Services statistics STATES Number of processes in each of the scheduler states SYSTEM Summary of statistics from other classes TIMER Timer Queue Entry (TQE) statistics TRANSACTION DECdtm services statistics VECTOR Vector processor scheduled usage
/BEGINNING=timeSpecifies the time that monitoring begins, by using a combination of absolute and delta times. Observe the syntax rules for time values described in the online help topic DCL_Tips (subtopic Date_Time).
If you are monitoring a running system, and you omit the /BEGINNING qualifier, monitoring begins when you enter the MONITOR command. However, if you have specified the /INPUT qualifier to play back data from an input recording file, /BEGINNING defaults to the beginning time recorded in the input file. If you specify /BEGINNING with a time but are playing back a recording file, MONITOR selects either the beginning time of the file or the beginning time you specify, whichever is later. If you are monitoring a remote node, the local node time is used to determine beginning time.
If you specify a future time for a request to monitor a running system, MONITOR issues an informational message, and the process issuing the request hibernates until the specified time. This feature can be useful when you run MONITOR from a batch job.
/NOBY_NODESpecifies that performance class data in a multifile summary be displayed as a single column of AVERAGE statistics for each node.
The /BY_NODE qualifier displays data in a multifile summary. If you specify only one input file, MONITOR ignores the /BY_NODE qualifier because you are not performing a multifile summary.
You can specify the /BY_NODE qualifier only in combination with the /SUMMARY qualifier. One column of AVERAGE statistics per node appears for each class requested.
By default, multifile summaries include one column of AVERAGE statistics for each node requested in each input file.
/NOCOMMENT (default)Specifies an ASCII string to be stored in the output recording file. The string can contain up to 60 characters.
The /COMMENT qualifier is valid only when /RECORD is also specified. (MONITOR ignores the /COMMENT qualifier if you do not use the /RECORD qualifier in the command line.) If you omit the qualifier or specify /NOCOMMENT, a string consisting of 60 blanks is stored in the recording file by default.
When a recording file containing a comment is played back, the comment is included in the heading of the display or single-file summary. Note that comment text is not displayed on playback for the CLUSTER class unless either the /SUMMARY or the /ALL qualifier is also used.
/NODISPLAYSpecifies whether information collected by MONITOR is to be displayed as ASCII screen images. Optionally names the disk file to contain the output.
If you omit the optional file specification, output is written to SYS$OUTPUT.
Note that although display output is produced by default, display output is never produced when a multifile summary is requested.
/ENDING=timeSpecifies the time that monitoring ends, by using a combination of absolute and delta times. Observe the syntax rules for time values described in the online help topic DCL_Tips (subtopic Date_Time).
If you are monitoring a running system and omit the /ENDING qualifier, monitoring continues until you terminate the request with Ctrl/C or Ctrl/Z. If you have also specified the /INPUT qualifier to play back data from an input recording file, /ENDING defaults to the ending time recorded in the input file. If you specify /ENDING with a time, but are playing back a recording file, MONITOR selects the earlier of the ending time of the file and the ending time you specify. For live requests, the local node's time-stamp is used to determine ending time.
You can prematurely terminate a request, regardless of the value of the /ENDING qualifier, by pressing Ctrl/C or Ctrl/Z. To prematurely terminate a request running in a noninteractive process (that is, a batch job or a detached process or subprocess), enter the appropriate DCL command to terminate the process.
/FLUSH_INTERVAL=secondsSpecifies the interval, in seconds, at which data collected by MONITOR (contents of MONITOR buffers) is written to disk. Values must be in the range from 1 to 9,999. The default interval is 300 seconds.
If you are writing data to a shared recording file currently in use, specify a short interval to ensure that others accessing the file receive data that is as current as possible. The smaller the interval, the less data is lost if a system failure occurs while recording.
/NOINPUT (default)Controls whether performance data is played back from one or more input files or collected from the running system. If you specify more than one file, enclose the list in parentheses, and separate the file specifications with commas. Wildcard characters are allowed in the file specification.
Data in all files in the list must have been collected by the same OpenVMS version.
With multiple input files, you must use the /SUMMARY qualifier. The maximum number of files MONITOR accepts for a multifile summary is 5000. 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.
In a list of input files, any omitted segment of the file specification (name or type) is defaulted to the corresponding segment of the previous file specification.
If you omit the file type, and you have not specified the file type previously in an input file list, the default file type .DAT is used. If you omit the file specification, MONITOR assigns the default file name MONITOR.DAT. The current device and directory defaults are applied.
If you omit the qualifier, performance data is collected from the running system.
/INTERVAL=secondsSpecifies the sampling interval between data collection events, recording events, and display events. Values can range from 1 to 9,999,999.
Collection events, recording events, and display events occur within a MONITOR request. Use the /INTERVAL qualifier to control the frequency of these events. A collection event causes raw data for all requested classes to be collected from the operating system or from a previously recorded file. A recording event causes data for all requested classes to be written to a recording file. A display event causes a screen image to be composed, for a single class, from the accumulated data collected for that class since the beginning of the MONITOR request.
For live collection requests, a collection event is always followed immediately by a recording event (if requested). The frequency of collection/recording event pairs is controlled by the /INTERVAL qualifier, which specifies the number of seconds that must elapse between occurrences of the event pair. Display events occur asynchronously to collection/recording event pairs at a frequency governed by the /VIEWING_TIME qualifier.
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