I assume that if some process is submitting messages then some other
process is receiving messages, is the receiving program a user program, or
an MQ program ? (e.g. an MCA).
The queue manager treats the buffer size provided by the receiving
application as a hint as to how big the message is likely to be, this
causes overheads if the app specifies a very large buffer size
unnecessarily. If the receiving process specifies a very large buffer size
then the agent will allocate a buffer into which the message could be read,
while if the application specifies a reasonable buffer size then the agent
will read the message directly into shared memory from where it can be
copied to the application process.
Andy.
David Awerbuch <[EMAIL PROTECTED]>@AKH-WIEN.AC.AT> on 06/13/2002
10:05:26 PM
Please respond to MQSeries List <[EMAIL PROTECTED]>
Sent by: MQSeries List <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
cc:
Subject: vms process for amqzlaa0.exe over-paging
Hello,
I have a simple MQ installation here, on a VAX 7000-650. I have an
application
that is submitting 1000 byte messages, one at a tine, persistent, CMIT
after
each one.
I noticed that while my application is running, an agent process running
AMQZLAA0.EXE is regularly soft-paging about 450 pages per second - this
coming
from polycenter performance graphs generated from data collected realtime,
as
well as from watching a "show proc /cont". It is not hard-paging. The
process
consistently uses 31760 virtual pages, with regular jumps to about 32900
and
then drops back to 31760.
Does anyone have any ideas why the ZAA0 executable is soft-paging so much?
We've been writing off as an artifact of the way AMQZLAA0 is handling
messages;
that it acquires a buffer, copies the messages into it and build control
blocks, then releases it again. But, given a message size of 1000 bytes
(that
2-3 pages), and a current throughput of only about 1 message per second, I
can;t see how that many pages would be acquired and released per second to
process a single message.
I hope someone in IBM can help me out here.
Thanks,
Dave A.
Here is the "show process" for AAZ0.
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
13-JUN-2002 16:52:40.70 User: MQADMIN Process ID: 24016D05
Node: VAXP Process name:
"VAXPQM_AG_5"
Terminal:
User Identifier: [MQSERIES,MQS_SERVER]
Base priority: 4
Default file spec: Not available
Process Quotas:
Account name: SYSTEM
CPU limit: Infinite Direct I/O limit: 250
Buffered I/O byte count quota: 169280 Buffered I/O limit: 500
Timer queue entry quota: 233 Open file quota: 284
Paging file quota: 942280 Subprocess quota: 92
Default page fault cluster: 64 AST quota: 247
Enqueue quota: 4739 Shared file limit: 0
Max detached processes: 0 Max active jobs: 0
Accounting information:
Buffered I/O count: 542 Peak working set size: 5567
Direct I/O count: 188 Peak virtual size: 32732
Page faults: 29680 Mounted volumes: 0
Images activated: 1
Elapsed CPU time: 0 00:00:06.68
Connect time: 0 00:00:24.50
Authorized privileges:
ACNT ALLSPOOL ALTPRI AUDIT BUGCHK BYPASS CMEXEC
CMKRNL
DETACH DIAGNOSE DOWNGRADE EXQUOTA GROUP GRPNAM GRPPRV
IMPORT
LOG_IO MOUNT NETMBX OPER PFNMAP PHY_IO PRMCEB
PRMGBL
PRMMBX PSWAPM READALL SECURITY SETPRV SHARE SHMEM
SYSGBL
SYSLCK SYSNAM SYSPRV TMPMBX UPGRADE VOLPRO WORLD
Process privileges:
ACNT may suppress accounting messages
ALLSPOOL may allocate spooled device
ALTPRI may set any priority value
AUDIT may direct audit to system security audit log
BUGCHK may make bug check log entries
BYPASS may bypass all object access controls
CMEXEC may change mode to exec
CMKRNL may change mode to kernel
DETACH may create detached processes
DIAGNOSE may diagnose devices
DOWNGRADE may downgrade object secrecy
EXQUOTA may exceed disk quota
GROUP may affect other processes in same group
GRPNAM may insert in group logical name table
GRPPRV may access group objects via system protection
IMPORT may set classification for unlabeled object
LOG_IO may do logical i/o
MOUNT may execute mount acp function
NETMBX may create network device
OPER may perform operator functions
PFNMAP may map to specific physical pages
PHY_IO may do physical i/o
PRMCEB may create permanent common event clusters
PRMGBL may create permanent global sections
PRMMBX may create permanent mailbox
PSWAPM may change process swap mode
READALL may read anything as the owner
SECURITY may perform security administration functions
SETPRV may set any privilege bit
SHARE may assign channels to non-shared devices
SHMEM may create/delete objects in shared memory
SYSGBL may create system wide global sections
SYSLCK may lock system wide resources
SYSNAM may insert in system logical name table
SYSPRV may access objects via system protection
TMPMBX may create temporary mailbox
UPGRADE may upgrade object integrity
VOLPRO may override volume protection
WORLD may affect other processes in the world
Process rights:
INTERACTIVE
REMOTE
MQM resource
System rights:
SYS$NODE_VAXP
Auto-unshelve: on
Image Dump: off
There are 9 processes in this job:
VAXPQM_EC
VAXPQM_LG
VAXPQM_CP
VAXPQM_AG_1
VAXPQM_AG_2
VAXPQM_AG_3
VAXPQM_AG_4
VAXPQM_AG
VAXPQM_AG_5 (*)
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
here is the "show process" for my application:
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
$ show proc st400_tna2030
13-JUN-2002 16:55:02.92 User: ST400533TST Process ID: 240180C3
Node: VAXP Process name:
"ST400_TNA2030"
Terminal: TNA2030: (Host: vaxp Port: 2017 )
User Identifier: [ST400533TST]
Base priority: 4
Default file spec: Not available
Devices allocated: VAXP$TNA2030:
$ show proc st400_tna2030/all
13-JUN-2002 16:55:10.15 User: ST400533TST Process ID: 240180C3
Node: VAXP Process name:
"ST400_TNA2030"
Terminal: TNA2030: (Host: vaxp Port: 2017 )
User Identifier: [ST400533TST]
Base priority: 4
Default file spec: Not available
Devices allocated: VAXP$TNA2030:
Process Quotas:
Account name:
CPU limit: Infinite Direct I/O limit: 1024
Buffered I/O byte count quota: 1498464 Buffered I/O limit: 1024
Timer queue entry quota: 511 Open file quota: 508
Paging file quota: 997012 Subprocess quota: 256
Default page fault cluster: 64 AST quota: 1019
Enqueue quota: 1987 Shared file limit: 0
Max detached processes: 0 Max active jobs: 0
Accounting information:
Buffered I/O count: 88757 Peak working set size: 1685
Direct I/O count: 59630 Peak virtual size: 32138
Page faults: 4511 Mounted volumes: 0
Images activated: 15
Elapsed CPU time: 0 00:04:56.18
Connect time: 0 00:52:13.44
Authorized privileges:
ACNT ALLSPOOL ALTPRI BUGCHK CMEXEC CMKRNL DETACH
DIAGNOSE
EXQUOTA GROUP GRPNAM GRPPRV LOG_IO MOUNT NETMBX OPER
PFNMAP PHY_IO PRMCEB PRMGBL PRMMBX PSWAPM READALL
SECURITY
SETPRV SHARE SHMEM SYSGBL SYSLCK SYSNAM SYSPRV
TMPMBX
VOLPRO WORLD
Process privileges:
ACNT may suppress accounting messages
ALLSPOOL may allocate spooled device
ALTPRI may set any priority value
AUDIT may direct audit to system security audit log
BUGCHK may make bug check log entries
BYPASS may bypass all object access controls
CMEXEC may change mode to exec
CMKRNL may change mode to kernel
DETACH may create detached processes
DIAGNOSE may diagnose devices
DOWNGRADE may downgrade object secrecy
EXQUOTA may exceed disk quota
GROUP may affect other processes in same group
GRPNAM may insert in group logical name table
GRPPRV may access group objects via system protection
IMPORT may set classification for unlabeled object
LOG_IO may do logical i/o
MOUNT may execute mount acp function
NETMBX may create network device
OPER may perform operator functions
PFNMAP may map to specific physical pages
PHY_IO may do physical i/o
PRMCEB may create permanent common event clusters
PRMGBL may create permanent global sections
PRMMBX may create permanent mailbox
PSWAPM may change process swap mode
READALL may read anything as the owner
SECURITY may perform security administration functions
SETPRV may set any privilege bit
SHARE may assign channels to non-shared devices
SHMEM may create/delete objects in shared memory
SYSGBL may create system wide global sections
SYSLCK may lock system wide resources
SYSNAM may insert in system logical name table
SYSPRV may access objects via system protection
TMPMBX may create temporary mailbox
UPGRADE may upgrade object integrity
VOLPRO may override volume protection
WORLD may affect other processes in the world
Process rights:
INTERACTIVE
REMOTE
ST400_000232
ST400_DEDICATED_PRINTER
ST400_SHAREABLE_PRINTER
ST400_CARD_READER
MQM resource
System rights:
SYS$NODE_VAXP
Auto-unshelve: on
Image Dump: off
There is 1 process in this job:
ST400_TNA2030 (*)
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
=====
David A. Awerbuch, IBM Certified MQSeries Specialist
APC Consulting Services, Inc.
Providing Automated Solutions to Business Challenges
West Hempstead, NY (516) 481-6440
[EMAIL PROTECTED]
__________________________________________________
Do You Yahoo!?
Yahoo! - Official partner of 2002 FIFA World Cup
http://fifaworldcup.yahoo.com
Instructions for managing your mailing list subscription are provided in
the Listserv General Users Guide available at http://www.lsoft.com
Archive: http://vm.akh-wien.ac.at/MQSeries.archive
Instructions for managing your mailing list subscription are provided in
the Listserv General Users Guide available at http://www.lsoft.com
Archive: http://vm.akh-wien.ac.at/MQSeries.archive
