Segment details and -O options
Review the segment details and -O options for the svmon command.
Segment details can be added to the user, command, process,
and class reports after the summary when the -O segment=on or -O
segment=category option is set to:
- -O segment=on, the list of segments is displayed for each entity.
- -O segment=category, the segments are grouped into the
following three categories for each entity:
- system: used by the system
- exclusive: used only by one entity, except for shared memory (shm) segments
- shared: used by two or more entities, except for shared memory (shm) segments
The following table contains the description of the items
that the svmon reports for segment information.
| Segment type | Segment usage | Description |
|---|---|---|
| persistent | log files | IO space mapping |
| persistent | files and directories | device name : inode number |
| persistent | large files | large file device name : inode number |
| mapping | files mapping | mapped to sid source sid no longer mapped |
| working | data areas of processes and shared memory segments | dependent on the role of the segment based on the VSID and ESID |
| client | NFS and CD-ROM files | dependent on the role of the segment based on the VSID and ESID |
| client | JFS2 files | device name: inode number |
| rmapping | I/O space mapping | dependent on the role of the segment based on the VSID and ESID |
When -O segment=on or -O segment=category is set, additional details can be added:
- -O range=on: each segment is followed by the ranges, within
the segment, where pages have been allocated.
Example:
# svmon -P 1 -O range=on Unit: page ------------------------------------------------------------------------------- Pid Command Inuse Pin Pgsp Virtual 1 init 16874 8052 0 16858 Vsid Esid Type Description PSize Inuse Pin Pgsp Virtual 0 0 work kernel segment m 576 503 0 576 Addr Range: 0..3945 d802d d work shared library text m 467 0 0 467 Addr Range: 0..562 1001 2 work process private s 98 4 0 98 Addr Range: 0..179 : 65309..65535 1c101d f work shared library data s 72 0 0 72 Addr Range: 0..545 1a101b 1 clnt code,/dev/hd2:531 s 11 0 - - Addr Range: 0..10 21023 - clnt /dev/hd4:1236 s 5 0 - - Addr Range: 0..4 - -O pidlist=on and -O pidlist=number: adds either
the list of PIDs of processes or the number of processes using this
segment. It also adds either the user name or the command name corresponding
to each PID. When the -@ flag is added, the WPAR name is also
added.
Example:
# svmon -C yes -O pidlist=on Unit: page =============================================================================== Command Inuse Pin Pgsp Virtual yes 16893 8112 0 16892 Vsid Esid Type Description PSize Inuse Pin Pgsp Virtual 0 0 work kernel segment m 579 506 0 579 System segment d802d d work shared library text m 468 0 0 468 Shared library text segment 111750 2 work process private s 18 4 0 18 pid(s)=348386 e174f 2 work process private s 18 4 0 18 pid(s)=340154 131752 2 work process private s 18 4 0 18 pid(s)=389352 1c171d 2 work process private s 18 4 0 18 pid(s)=360640 81749 f work shared library data s 17 0 0 17 pid(s)=340154 71726 f work shared library data s 17 0 0 17 pid(s)=360640 101751 f work shared library data s 17 0 0 17 pid(s)=348386 121753 f work shared library data s 17 0 0 17 pid(s)=389352 a172b 1 clnt code,/dev/hd2:338 s 1 0 - - pid(s)=389352, 360640, 348386, 340154 # svmon -C yes -O pidlist=number Unit: page =============================================================================== Command Inuse Pin Pgsp Virtual yes 16893 8112 0 16892 Vsid Esid Type Description PSize Inuse Pin Pgsp Virtual 0 0 work kernel segment m 579 506 0 579 System segment d802d d work shared library text m 468 0 0 468 Shared library text segment 111750 2 work process private s 18 4 0 18 pid number=1 e174f 2 work process private s 18 4 0 18 pid number=1 131752 2 work process private s 18 4 0 18 pid number=1 1c171d 2 work process private s 18 4 0 18 pid number=1 81749 f work shared library data s 17 0 0 17 pid number=1 71726 f work shared library data s 17 0 0 17 pid number=1 101751 f work shared library data s 17 0 0 17 pid number=1 121753 f work shared library data s 17 0 0 17 pid number=1 a172b 1 clnt code,/dev/hd2:338 s 1 0 - - pid number=4 - -O filename=on: Each persistent segment's complete, corresponding
file name is shown. Note that because files can be deeply nested,
running the svmon command with this flag, or with the -S and -i flags,
can take significantly more time.
Example:
# svmon -P 266414 -O filename=on,format=nolimit Unit: page ------------------------------------------------------------------------------- Pid Command Inuse Pin Pgsp Virtual 266414 IBM.ServiceRMd 17227 8116 0 17174 Vsid Esid Type Description PSize Inuse Pin Pgsp Virtual 0 0 work kernel segment m 579 506 0 579 d802d d work shared library text m 468 0 0 468 31322 2 work process private s 202 4 0 202 171316 f work shared library data s 167 0 0 167 1e133f - work s 52 16 0 52 11320 1 clnt code,/dev/hd2:9929 s 51 0 - - /opt/rsct/bin/IBM.ServiceRMd b134a - clnt /dev/hd9var:368 s 1 0 - - /var/ct/3394394444/registry/local_tree/IBM,ServiceEvent,Class a134b - clnt /dev/hd9var:372 s 1 0 - - /var/ct/3394394444/registry/local_tree/IBM,ServiceEvent,Resources 1341 4 work shared memory segment s 1 0 0 1 121333 3 mmap maps 2 source(s) s 0 0 - - 131312 - clnt /dev/hd9var:360 s 0 0 - - /var/ct/IBM.ServiceRM.stderr 111310 - clnt /dev/hd9var:418 s 0 0 - - /var/ct/3394394444/lck/mc/RMIBM.ServiceRM - -O mapping=on: adds information about the source segment
and the mapping segment when a segment is used to map another segment.
If this option is used, source segments not belonging to the process
address space are listed in the report and marked with an asterisk
(*). Note that they are also taken into account in the process-level
summary's number calculations.
Example:
# svmon -P 266414 -O mapping=off Unit: page ------------------------------------------------------------------------------- Pid Command Inuse Pin Pgsp Virtual 266414 IBM.ServiceRM 17227 8116 0 17174 # svmon -P 266414 -O mapping=on Unit: page ------------------------------------------------------------------------------- Pid Command Inuse Pin Pgsp Virtual 266414 IBM.ServiceRM 17231 8116 0 17174 # svmon -P 266414 -O mapping=on,segment=on Unit: page ------------------------------------------------------------------------------- Pid Command Inuse Pin Pgsp Virtual 266414 IBM.ServiceRM 17231 8116 0 17174 Vsid Esid Type Description PSize Inuse Pin Pgsp Virtual 0 0 work kernel segment m 579 506 0 579 d802d d work shared library text m 468 0 0 468 31322 2 work process private s 202 4 0 202 171316 f work shared library data s 167 0 0 167 1e133f - work s 52 16 0 52 11320 1 clnt code,/dev/hd2:9929 s 51 0 - - 191338 * - clnt /dev/hd9var:363 s 3 0 - - 131332 * - clnt /dev/hd9var:361 s 1 0 - - b134a - clnt /dev/hd9var:368 s 1 0 - - a134b - clnt /dev/hd9var:372 s 1 0 - - 1341 4 work shared memory segment s 1 0 0 1 131312 - clnt /dev/hd9var:360 s 0 0 - - 121333 3 mmap maps 2 source(s) s 0 0 - - source(s)=131332, 191338 111310 - clnt /dev/hd9var:418 s 0 0 - -
In these examples, the mapping option adds or removes the mapping source segments which are not in the address space of the process number 266414. There is a difference of four pages (three pages from segment 191338, and one page from segment 131332) in the Inuse consumption between -O mapping=off and -O mapping=on.
- -O sortseg=[inuse | pin | pgsp | virtual]: by default,
, all segments are sorted in decreasing order of real memory usage
(the Inuse metric) for each entity (user, process, command, segment).
Sorting options for the report include the following:
- Inuse: real memory used
- Pin: pinned memory used
- Pgsp: paging space memory used
- Virtual: virtual memory used
Examples:
# svmon -P 1 -O unit=KB,segment=on Unit: KB ------------------------------------------------------------------------------- Pid Command Inuse Pin Pgsp Virtual 1 init 67752 32400 0 67688 Vsid Esid Type Description PSize Inuse Pin Pgsp Virtual 0 0 work kernel segment m 37056 32384 0 37056 d802d d work shared library text m 29952 0 0 29952 1001 2 work process private s 392 16 0 392 1c101d f work shared library data s 288 0 0 288 1a101b 1 clnt code,/dev/hd2:531 s 44 0 - - 21023 - clnt /dev/hd4:1236 s 20 0 - - # svmon -P 1 -O unit=KB,segment=on,sortseg=pin Unit: KB ------------------------------------------------------------------------------- Pid Command Inuse Pin Pgsp Virtual 1 init 67752 32400 0 67688 Vsid Esid Type Description PSize Inuse Pin Pgsp Virtual 0 0 work kernel segment m 37056 32384 0 37056 1001 2 work process private s 392 16 0 392 21023 - clnt /dev/hd4:1236 s 20 0 - - d802d d work shared library text m 29952 0 0 29952 1a101b 1 clnt code,/dev/hd2:531 s 44 0 - - 1c101d f work shared library data s 288 0 0 288 - -O mpss=[on | off]: breaks down the metrics for multiple
page size segments, by page size.
Examples:
# svmon -P 1 -O segment=on,mpss=on Unit: page ------------------------------------------------------------------------------- Pid Command Inuse Pin Pgsp Virtual 1 init 14557 5492 0 14541 Vsid Esid Type Description PSize Inuse Pin Pgsp Virtual 502d d work shared library text m 502 0 0 502 2002 0 work kernel segment m 396 343 0 396 10001 2 work process private s 100 4 0 100 m 0 0 0 0 8019 f work shared library data s 73 0 0 73 m 0 0 0 0 6017 1 clnt code,/dev/hd2:532 s 11 0 - - e01f - clnt /dev/hd4:893 s 5 0 - -sm pages are separated into s and m pages. The metrics reported are in the unit of the page size: s pages are 4 KB and m pages are 64 KB.
- -O shmid=[on | off]: displays shared memory IDs associated
with shared memory segments. This option does not work you run it
in inside a WPAR.
Examples:
# svmon -P 221326 -O commandline=on,segment=on,shmid=on,filterprop=notempty Command line : svmon -P 221326 -O commandline=on,segment=on,shmid=on,filterprop=notempty Unit: page ------------------------------------------------------------------------------- Pid Command Inuse Pin Pgsp Virtual 221326 java 20619 6326 9612 27584 Vsid Esid Type Description PSize Inuse Pin Pgsp Virtual 502d d work text or shared-lib code seg m 585 0 1 585 0 0 work kernel segment m 443 393 4 444 14345 3 work working storage sm 2877 0 7865 9064 15364 e work shared memory segment sm 1082 0 1473 1641 shmid:3 1b36a f work working storage sm 105 0 106 238 17386 - work s 100 34 64 146 1a38b 2 work process private sm 7 4 24 31