Memory usage by processes
The svmon -P command displays the memory usage statistics for all the processes currently running on a system.
# svmon -P
--------------------------------------------------------------------------------
Pid Command Inuse Pin Pgsp Virtual 64-bit Mthrd 16MB
16264 IBM.ServiceRM 10075 3345 3064 13310 N Y N
PageSize Inuse Pin Pgsp Virtual
s 4 KB 10075 3345 3064 13310
L 16 MB 0 0 0 0
Vsid Esid Type Description PSize Inuse Pin Pgsp Virtual
f001e d work shared library text s 4857 0 36 6823
0 0 work kernel seg s 4205 3335 2674 5197
b83f7 2 work process private s 898 2 242 1098
503ea f work shared library data s 63 0 97 165
c8439 1 pers code,/dev/hd2:149841 s 28 0 - -
883f1 - work s 21 8 14 26
e83dd - pers /dev/hd2:71733 s 2 0 - -
f043e 4 work shared memory segment s 1 0 1 1
c0438 - pers large file /dev/hd9var:243 s 0 0 - -
b8437 3 mmap mapped to sid a03f4 s 0 0 - -
583eb - pers large file /dev/hd9var:247 s 0 0 - -
--------------------------------------------------------------------------------
Pid Command Inuse Pin Pgsp Virtual 64-bit Mthrd 16MB
17032 IBM.CSMAgentR 9791 3347 3167 12944 N Y N
PageSize Inuse Pin Pgsp Virtual
s 4 KB 9791 3347 3167 12944
L 16 MB 0 0 0 0
Vsid Esid Type Description PSize Inuse Pin Pgsp Virtual
f001e d work shared library text s 4857 0 36 6823
0 0 work kernel seg s 4205 3335 2674 5197
400 2 work process private s 479 2 303 674
38407 f work shared library data s 120 0 127 211
a83f5 1 pers code,/dev/hd2:149840 s 99 0 - -
7840f - work s 28 10 27 39
e83dd - pers /dev/hd2:71733 s 2 0 - -
babf7 - pers /dev/hd2:284985 s 1 0 - -
383e7 - pers large file /dev/hd9var:186 s 0 0 - -
e03fc - pers large file /dev/hd9var:204 s 0 0 - -
f839f 3 mmap mapped to sid 5840b s 0 0 - -
[...]
Inuse page
count. You can change the sorting rule using the svmon command
with either the -u, -p, -g, or -v flags.For a summary of the top 15 processes using memory on the system, use the following command:
# svmon -Pt15 | perl -e 'while(<>){print if($.==2||$&&&!$s++);$.=0 if(/^-+$/)}'
--------------------------------------------------------------------------------
Pid Command Inuse Pin Pgsp Virtual 64-bit Mthrd 16MB
16264 IBM.ServiceRM 10075 3345 3064 13310 N Y N
17032 IBM.CSMAgentR 9791 3347 3167 12944 N Y N
21980 zsh 9457 3337 2710 12214 N N N
22522 zsh 9456 3337 2710 12213 N N N
13684 getty 9413 3337 2710 12150 N N N
26590 perl5.8.0 9147 3337 2710 12090 N N N
7514 sendmail 9390 3337 2878 12258 N N N
14968 rmcd 9299 3340 3224 12596 N Y N
18940 ksh 9275 3337 2710 12172 N N N
14424 ksh 9270 3337 2710 12169 N N N
4164 errdemon 9248 3337 2916 12255 N N N
3744 cron 9217 3337 2770 12125 N N N
11424 rpc.mountd 9212 3339 2960 12290 N Y N
21564 rlogind 9211 3337 2710 12181 N N N
26704 rlogind 9211 3337 2710 12181 N N N
The Pid 16 264 is the process ID that has the highest memory consumption. The Command indicates the command name, in this case IBM®.ServiceRM. The Inuse column, which is the total number of pages in real memory from segments that are used by the process, shows 10 075 pages. Each page is 4 KB. The Pin column, which is the total number of pages pinned from segments that are used by the process, shows 3 345 pages. The Pgsp column, which is the total number of paging-space pages that are used by the process, shows 3 064 pages. The Virtual column (total number of pages in the process virtual space) shows 13 310.
The detailed section displays information about each segment for each process
that is shown in the summary section. This includes the virtual, Vsid,
and effective, Esid, segment identifiers. The Esid reflects
the segment register that is used to access the corresponding pages. The type
of the segment is also displayed along with its description that consists
in a textual description of the segment, including the volume name and i-node
of the file for persistent segments. The report also details the size of the
pages the segment is backed by, where s denotes 4 KB pages
and L denotes 16 MB pages, the number of pages in RAM, Inuse,
number of pinned pages in RAM ,Pin, number of pages in paging
space, Pgsp, and number of virtual pages, Virtual.
# svmon -S f001e 400 e83dd -l -r -j
Vsid Esid Type Description PSize Inuse Pin Pgsp Virtual
f001e d work shared library text s 4857 0 36 6823
Addr Range: 0..60123
Shared library text segment
400 2 work process private s 480 2 303 675
Addr Range: 0..969 : 65305..65535
pid(s)=17032
e83dd - pers /dev/hd2:71733 s 2 0 - -
/usr/lib/nls/loc/uconvTable/ISO8859-1
Addr Range: 0..1
pid(s)=17552, 17290, 17032, 16264, 14968, 9620
The Address Range specifies one range for a persistent or client segment and two ranges for a working segment. The range for a persistent or a client segment takes the form '0..x,' where x is the maximum number of virtual pages that have been used. The range field for a working segment can be '0..x : y..65535', where 0..x contains global data and grows upward, and y..65535 contains stack area and grows downward. For the address range, in a working segment, space is allocated starting from both ends and working towards the middle. If the working segment is non-private (kernel or shared library), space is allocated differently.
In the above example, the segment ID 400 is a private working segment; its address range is 0..969 : 65305..65535. The segment ID f001e is a shared library text working segment; its address range is 0..60123.
A segment can be used by multiple processes. Each page in real memory from
such a segment is accounted for in the Inuse field for each process
using that segment. Thus, the total for Inuse may exceed the total
number of pages in real memory. The same is true for the Pgsp and Pin fields.
The values displayed in the summary section consist of the sum of Inuse, Pin,
and Pgsp, and Virtual counters of all segments used
by the process.
In the above example, the e83dd segment is used by several
processes whose PIDs are 17552, 17290, 17032, 16264, 14968 and 9620.