The
AUTOGEN command procedure, SYS$UPDATE:AUTOGEN.COM, is provided on
your distribution kit, and runs automatically when your system is
installed or upgraded to set appropriate values for system parameters.
In addition, HP recommends that you run AUTOGEN when you want to
reset values for system parameters or to resize page, swap, and
dump files. The new values and file sizes take effect the next time
the system boots.
AUTOGEN only calculates certain significant system parameters.
Refer to the AUTOGEN section of HP OpenVMS System Management Utilities Reference Manual: A--L for a table of system
parameters affected by AUTOGEN calculation.
HP recommends running AUTOGEN in the following circumstances:
During a new installation or upgrade.
(This happens automatically as part of the installation or upgrade procedure.)
Whenever your work load changes significantly.
When you add an optional (layered) software product.
See the specific product documentation for installation requirements.
Certain layered products might require you to execute AUTOGEN to
adjust parameter values and page and swap file sizes. (For information
about using AUTOGEN to modify page and swap files, see
Using AUTOGEN (Recommended Method).)
When you install images with the /SHARED attribute;
the GBLSECTIONS and GBLPAGES parameters might need to be increased
to accommodate the additional global pages and global sections consumed.
On a regular basis to monitor changes in your system's
work load. You can automate AUTOGEN to regularly check feedback
and recommend system parameter changes.
Automating AUTOGEN Reports describes a batch-oriented command procedure
that runs AUTOGEN in feedback mode on a regular basis and automatically
sends the feedback report to an appropriate Mail account.
Periodically to provide adequate swapping file space.
Use the FEEDBACK option and make sure the system has been up long
enough (at least 24 hours) and that the load is typical. Also, make
sure the SYS$SYSTEM:MODPARAMS.DAT file does not contain a hardcoded
SWAPFILE value, which prevents AUTOGEN from correctly sizing the
swapping files.
AUTOGEN Operations
AUTOGEN executes in phases. Depending on which phases you
direct it to execute, AUTOGEN performs some or all of the following
operations:
Collects the following types of data:
Feedback (from the running system)
The hardware configuration (from the system)
Parameter requirements supplied by you (from MODPARAMS.DAT)
Parameter requirements supplied by HP
Calculates appropriate new values for significant
system parameters (listed in the AUTOGEN section of the HP OpenVMS System Management Utilities Reference Manual)
Creates a new installed image list
Calculates the sizes of system page, swap, and dump
files
Adjusts the sizes of system page, swap, and dump
files values of system parameter values, if necessary
Optionally shuts down and reboots the system
Invoking AUTOGEN
To invoke AUTOGEN, enter a command in the following format
at the DCL prompt:@SYS$UPDATE:AUTOGEN [start-phase] [end-phase] [execution-mode]
where:
start-phase
Is the phase where AUTOGEN
is to begin executing.
AUTOGEN Phases lists the AUTOGEN phases.
end-phase
Is the phase where AUTOGEN
is to complete executing.
AUTOGEN Phases lists the AUTOGEN phases.
execution-mode
Is one of the following modes:
FEEDBACK--Use feedback.
NOFEEDBACK--Do not use feedback.
CHECK_FEEDBACK--Use feedback if it is valid.
If feedback is invalid, ignore it, but continue executing through
the end phase.
Blank (no execution mode specified)--Use
feedback if it is valid. If it is not valid, quit before making
any modifications.
For detailed information about invoking AUTOGEN, and the command
line parameters you can specify, refer to the AUTOGEN section of HP OpenVMS System Management Utilities Reference Manual: A--L.
Controlling AUTOGEN Operations
Controlling AUTOGEN summarizes
the methods for controlling AUTOGEN behavior.
Table 1 Controlling AUTOGEN
To Control...
Use This Method...
Which operations AUTOGEN
is to perform
Specify a start phase and
an end phase when you invoke AUTOGEN.
Parameter values
set by AUTOGEN
Specify values in the AUTOGEN
parameter file MODPARAMS.DAT.
Periodically examine the
results of calculations that AUTOGEN makes to determine whether
AUTOGEN has drawn the correct conclusions about your hardware configuration
and to be sure the system parameter values are appropriate for your
workload requirements. If the values are not appropriate, adjust
them by specifying desired values in MODPARAMS.DAT. For more information
on MODPARAMS.DAT, see
AUTOGEN Parameter File (MODPARAMS.DAT).
AUTOGEN's use of feedback
information
Specify an execution mode when you invoke
AUTOGEN.
AUTOGEN can often improve system performance
by using dynamic feedback gathered from the running system. However,
feedback information is not always valid or appropriate. For more
information, see
AUTOGEN Feedback.
AUTOGEN Feedback AUTOGEN feedback minimizes the need for you to modify parameter
values or system file sizes. Instead, feedback allows AUTOGEN to
automatically size the operating system based on your actual work
load. Sizing is the process of matching the
allocation of system resources (memory and disk space) with the workload
requirements of your site.
Feedback is information, continuously
collected by the operating system executive, about the amount of various
resources the system uses to process its work load. The information
is collected when exception events occur, so the collection does
not affect system performance. When run in feedback mode,
AUTOGEN analyzes this information and adjusts any related parameter
values.
When running AUTOGEN after making a major configuration
change, specify nofeedback to assure
the use of initial AUTOGEN settings. See
Understanding the AUTOGEN Command Procedure.
AUTOGEN
feedback affects the following resources (for a complete list of
the affected system parameters, refer to the AUTOGEN section of HP OpenVMS System Management Utilities Reference Manual: A--L):
Nonpaged pool
Paged pool
Lock resources
Number of processes
Global pages
Global sections
File system caches
System logical name table sizes
Page files
Swap files
Feedback is gathered
during AUTOGEN's SAVPARAMS phase and is written to the file SYS$SYSTEM:AGEN$FEEDBACK.DAT.
This file is then read during the GETDATA phase. (See
AUTOGEN Phases for more information about
AUTOGEN phases.)
Feedback
is useful only if it accurately reflects the system's normal work
load. For this reason, AUTOGEN performs some basic checks on the
feedback and issues a warning message for either of the following conditions:
The system has been up for less than
24 hours.
The feedback is over 30 days old.
Whenever you modify the system (for example, a hardware upgrade,
a change in the number of users, an optional product installation),
you should operate in the new system environment for a period of
time, and then execute AUTOGEN again starting from the SAVPARAMS
phase.
When AUTOGEN runs, it displays whether feedback is used, as
follows:
Feedback information was collected on 21-JAN-2000 14:00:08.53
Old values below are the parameter values at the time of collection.
The feedback data is based on 21 hours of up time.
Feedback information will be used in the subsequent calculations
Feedback Report (AGEN$PARAMS.REPORT) Decides whether to use the system parameter values and system
file sizes calculated by AUTOGEN. To help in your decision making,
AUTOGEN generates a report file (SYS$SYSTEM:AGEN$PARAMS.REPORT)
that includes the following information:
All parameters and system files directly
affected by the feedback
Current values
New values
The feedback used in each parameter calculation
Any user- or HP-supplied modifications found in
MODPARAMS.DAT
Any advisory or warning messages displayed during
AUTOGEN's operations
On VAX systems, any user- or HP-supplied modifications
found in VMSPARAMS.DAT
On Alpha systems, the parameters found during the
GENPARAMS phase
Sample AUTOGEN Feedback Report shows the contents of a sample AUTOGEN feedback
report for a VAX system. On Alpha systems, the feedback report is
similar but not identical to this example.
Suppressing Informational Messages
To suppress
the display of informational messages, define the AGEN$REPORT_NO_INFORMATIONALS logical
to TRUE. Messages are entered in SYS$SYSTEM:AGEN$PARAMS.REPORT regardless
of the value of AGEN$REPORT_NO_INFORMATIONALS.
Filtering DCL Statements from Your
Report
The feedback
report will contain DCL statements in MODPARAMS.DAT that are not
simple assignments to system parameters or the ADD_, MAX_, or MIN_
extensions. To filter these statements out of the report, begin
each statement in MODPARAMS.DAT with a dollar sign ($).
Example 1 Sample AUTOGEN Feedback Report
AUTOGEN Parameter Calculation Report on node: NODE22
This information was generated at 23-APR-2000 01:45:47.87
AUTOGEN was run from GETDATA to TESTFILES using FEEDBACK
** No changes will be done by AUTOGEN **
The values given in this report are what AUTOGEN would
have set the parameters to.
Processing Parameter Data files
-------------------------------
** WARNING ** - The system was up for less than 24 hours when the feedback
information was recorded. This could result in feedback information
that does not accurately reflect your typical work load.
Including parameters from: SYS$SYSTEM:MODPARAMS.DAT
The following was detected within MODPARAMS.DAT
Please review immediately.
** INFORMATIONAL ** - Multiple MIN values found for MIN_CHANNELCNT.
Using MODPARAMS value (550) which is superseding OpenVMS value (255)
** INFORMATIONAL ** - Multiple MIN values found for MIN_SWPOUTPGCNT.
Using MODPARAMS value (1000) which is superseding OpenVMS value (500)
** INFORMATIONAL ** - Multiple MIN values found for MIN_PQL_DWSEXTENT.
Using MODPARAMS value (11000) which is superseding OpenVMS value (1024)
** INFORMATIONAL ** - Multiple MIN values found for MIN_PQL_MWSEXTENT.
Using MODPARAMS value (11000) which is superseding OpenVMS value (1024)
Feedback information was collected on 22-APR-2000 14:00:07.70
Old values below are the parameter values at the time of collection.
The feedback data is based on 13 hours of up time.
Feedback information will be used in the subsequent calculations
Parameter information follows:
------------------------------
MAXPROCESSCNT parameter information:
Feedback information.
Old value was 100, New value is 80
Maximum Observed Processes: 52
Information about VMS executable image Processing:
Processing SYS$MANAGER:VMS$IMAGES_MASTER.DAT
GBLPAGFIL parameter information:
Override Information - parameter calculation has been overridden.
The calculated value was 1024. The new value is 6024.
GBLPAGFIL has been increased by 5000.
GBLPAGFIL is not allowed to be less than 6024.
GBLPAGES parameter information:
Feedback information.
Old value was 43300, New value is 50000
Peak used GBLPAGES: 36622
Global buffer requirements: 6024
GBLSECTIONS parameter information:
Feedback information.
Old value was 400, New value is 400
Peak used GBLSECTIONS: 294
Override Information - parameter calculation has been overridden.
The calculated value was 350. The new value is 400.
GBLSECTIONS is not allowed to be less than 400.
LOCKIDTBL parameter information:
Feedback information.
Old value was 2943, New value is 3071
Current number of locks: 1853
Peak number of locks: 3200
LOCKIDTBL_MAX parameter information:
Feedback information.
Old value was 65535, New value is 65535
RESHASHTBL parameter information:
Feedback information.
Old value was 1024, New value is 1024
Current number of resources: 957
MSCP_LOAD parameter information:
Override Information - parameter calculation has been overridden.
The calculated value was 1. The new value is 0.
MSCP_LOAD has been disabled by a hard-coded value of 0.
MSCP_BUFFER parameter information:
Feedback information.
Old value was 128, New value is 128
MSCP server I/O rate: 0 I/Os per 10 sec.
I/Os that waited for buffer space: 0
I/Os that fragmented into multiple transfers: 0
SCSCONNCNT parameter information:
Feedback information.
Old value was 5, New value is 5
Peak number of nodes: 1
Number of CDT allocation failures: 0
SCSRESPCNT parameter information:
Feedback information.
Old value was 300, New value is 300
RDT stall count: 0
SCSBUFFCNT parameter information:
Feedback information.
Old value was 512, New value is 512
CIBDT stall count: 0
NPAGEDYN parameter information:
Feedback information.
Old value was 686592, New value is 783360
Maximum observed non-paged pool size: 815616 bytes.
Non-paged pool request rate: 47 requests per 10 sec.
LNMSHASHTBL parameter information:
Feedback information.
Old value was 1024, New value is 1024
Current number of shareable logical names: 1194
ACP_DIRCACHE parameter information:
Feedback information.
Old value was 88, New value is 88
Hit percentage: 99%
Attempt rate: 0 attempts per 10 sec.
ACP_DINDXCACHE parameter information:
Feedback information.
Old value was 25, New value is 25
Hit percentage: 97%
Attempt rate: 1 attempts per 10 sec.
ACP_HDRCACHE parameter information:
Feedback information.
Old value was 88, New value is 106
Hit percentage: 98%
Attempt rate: 17 attempts per 10 sec.
ACP_MAPCACHE parameter information:
Feedback information.
Old value was 8, New value is 8
Hit percentage: 2%
Attempt rate: 4 attempts per 10 sec.
PAGEDYN parameter information:
Feedback information.
Old value was 521728, New value is 542208
Current paged pool usage: 304160 bytes.
Paged pool request rate: 1 requests per 10 sec.
PFRATL parameter information:
Override Information - parameter calculation has been overridden.
The calculated value was 0. The new value is 1.
PFRATL has been disabled by a hard-coded value of 1.
WSDEC parameter information:
Override Information - parameter calculation has been overridden.
The calculated value was 35. The new value is 19.
WSDEC has been disabled by a hard-coded value of 19.
MPW_LOLIMIT parameter information:
Override Information - parameter calculation has been overridden.
The calculated value was 120. The new value is 2100.
MPW_LOLIMIT is not allowed to be less than 2100.
MPW_HILIMIT parameter information:
Override Information - parameter calculation has been overridden.
The calculated value was 1310. The new value is 4500.
MPW_HILIMIT is not allowed to be less than 4500.
LONGWAIT parameter information:
Override Information - parameter calculation has been overridden.
The calculated value was 30. The new value is 10.
LONGWAIT has been disabled by a hard-coded value of 10.
WSMAX parameter information:
Override Information - parameter calculation has been overridden.
The calculated value was 8200. The new value is 12000.
WSMAX is not allowed to be less than 12000.
PROCSECTCNT parameter information:
Override Information - parameter calculation has been overridden.
The calculated value was 32. The new value is 40.
PROCSECTCNT is not allowed to be less than 40.
PQL_DWSEXTENT parameter information:
Override Information - parameter calculation has been overridden.
The calculated value was 400. The new value is 11000.
PQL_DWSEXTENT is not allowed to be less than 11000.
PQL_MWSEXTENT parameter information:
Override Information - parameter calculation has been overridden.
The calculated value was 2048. The new value is 11000.
PQL_MWSEXTENT is not allowed to be less than 11000.
VAXCLUSTER parameter information:
Override Information - parameter calculation has been overridden.
The calculated value was 1. The new value is 0.
VAXCLUSTER has been disabled by a hard-coded value of 0.
Page, Swap, and Dump file calculations
Page and Swap file calculations.
PAGEFILE1_SIZE parameter information:
Feedback information.
Old value was 45200, New value is 50500
Maximum observed usage: 25265
PAGEFILE1_SIZE will be modified to hold 50500 blocks
PAGEFILE2_SIZE parameter information:
Feedback information.
Old value was 154000, New value is 194400
Maximum observed usage: 97175
PAGEFILE2_SIZE will be modified to hold 194400 blocks
** WARNING ** - The disk on which PAGEFILE2 resides would be
over 95% full if it were modified to hold 194400 blocks.
NODE22$DKA300:[SYSTEM_FILES]PAGEFILE.SYS will not be modified.
NODE22$DKA300:[SYSTEM_FILES]PAGEFILE.SYS will remain at 154002 blocks.
SWAPFILE1_SIZE parameter information:
Feedback information.
Old value was 15000, New value is 15000
Maximum observed usage: 14280
Override Information - parameter calculation has been overridden.
The calculated value was 21400. The new value is 15000.
SWAPFILE1_SIZE is not allowed to exceed 15000.
SWAPFILE1 will not be modified.
SWAPFILE2_SIZE parameter information:
Feedback information.
Old value was 50000, New value is 26300
Maximum observed usage: 1680
SWAPFILE2_SIZE will be modified to hold 26300 blocks
** WARNING ** - The disk on which SWAPFILE2 resides would be
over 95% full if it were modified to hold 26300 blocks.
NODE22$DKA300:[SYSTEM_FILES]SWAPFILE.SYS will not be modified.
NODE22$DKA300:[SYSTEM_FILES]SWAPFILE.SYS will remain at 50001 blocks.
Dumpfile calculations:
No dump file modifications would have been made.
Dumpfile will remain at 34116 blocks.
AUTOGEN Phases When you invoke AUTOGEN, you specify a start phase and an
end phase for AUTOGEN to execute. AUTOGEN executes all phases from
the start phase to the end phase. Depending on the start phase and
end phase you specify, AUTOGEN can execute any of the following
phases, in the order shown in
AUTOGEN Phases.
Table 2 AUTOGEN Phases
Phase
Description
SAVPARAMS
Saves dynamic feedback from
the running system.
GETDATA
Collects all data to be
used in AUTOGEN calculations.
GENPARAMS
Generates new system parameters;
creates the installed image list.
TESTFILES
Displays the system page,
swap, and dump file sizes calculated by AUTOGEN (cannot be used
as a start phase).
GENFILES
Generates new system page,
swap, and dump files if appropriate (cannot be used as a start phase).
SETPARAMS
Runs SYSMAN to set the new
system parameters in the default parameter file, saves the original
parameters, and generates a new parameter file, AUTOGEN.PAR.
On
VAX systems, the default parameter file is VAXVMSSYS.PAR. The original parameters
are saved in the file VAXVMSSYS.OLD.
On Alpha systems,
the default parameter file is ALPHAVMSSYS.PAR. The original parameters
are saved in the file ALPHAVMSSYS.OLD.
SHUTDOWN
Prepares the system to await
a manual reboot.
REBOOT
Automatically shuts down
and reboots the system.
HELP
Displays help information to the screen.
For detailed information about each AUTOGEN phase and the
files affected by each phase, refer to the AUTOGEN section of HP OpenVMS System Management Utilities Reference Manual: A--L.
AUTOGEN Parameter File (MODPARAMS.DAT) AUTOGEN reads a parameter file named MODPARAMS.DAT during
the GETDATA phase. You can add commands to this file to control
the system parameter values and file sizes that AUTOGEN sets. You
can use MODPARAMS.DAT to perform the following actions:
Operation
For More Information
Increase the
value of any numeric system parameter
Specify an alternate default
startup command procedure
HP OpenVMS System Manager's Manual, Volume 1: Essentials
To help track changes you make to MODPARAMS.DAT, make sure
you add comments, preceded by the exclamation point (!), each time
you change the file.
The recommended method of changing system parameters
and system file sizes is to edit MODPARAMS.DAT to include parameter
settings. If you change a system parameter value or file size using
SYSMAN, SYSGEN, or a conversational boot, and you do not specify
the value in MODPARAMS.DAT, AUTOGEN will recalculate the value or
file size the next time it runs. For more information, see
Controlling AUTOGEN's Parameter Settings with MODPARAMS.DAT
Example
The following example shows
the contents of a sample MODPARAMS.DAT file:
!
! ***************** A Sample MODPARAMS.DAT for Node NODE22 ***************
!
! MODPARAMS.DAT for "NODE22"! REVISED: 04/29/00 -CHG- Upped GBLPAGES to account for ADA.
!
SCSNODE = "NODE22" ! This is not calculated by AUTOGEN.
SCSSYSTEMID = 19577 ! This is not calculated by AUTOGEN.
TTY_DEFCHAR2 = %X0D34 ! This is not calculated by AUTOGEN.
ADD_ACP_DIRCACHE= 150 ! Hit rate was only 65% on directory cache.
MIN_PAGEDYN = 500000 ! PAGEDYN must be at least 1/2 Mbyte to
! account for a large number of logical names.
!
MAX_PAGEFILE1_SIZE = 15000 ! Maximum size for primary page.
MAX_SWAPFILE = 5000 ! Maximum size for swap file space.
MAX_DUMPFILE = 32768 ! Maximum size for dump file space.
ADD_GBLPAGES = 425+507+157 ! Account for MCS, BLISS32 and ADA.
ADD_GBLSECTIONS = 4 + 5 + 2 ! Account for MCS, BLISS32 and ADA.
VIRTUALPAGECNT = 144264 ! So that we can read MONSTR's 68Mb dumps.
!
! end of MODPARAMS.DAT for NODE22
HP OpenVMS System Manager's Manual, Volume 2:... 
Managing System Parameters
