If you have high swap space usage, or defunct processes, the stop all application and cleanup the shared memory segments, queues and semaphores

Remove defunct interprocess communication segments.

List all memory segments:

$ ipcs -am | grep db2inst1

IPC status from  as of Thu Aug 30 13:16:55 2001
T      ID            KEY            MODE           OWNER          GROUP
Shared Memory:
m      9910          0x74006380     --rw-rw-rw-    db2inst1       db2grp
m      59714         0x61006380     --rw-------    db2inst1       db2grp 

From the list above, you notice that there are two memory segments that were not removed when executing ipclean. You must remove them manually:

$ ipcrm -m 9910
$ ipcrm -m 59714 

List all semaphore segments:

$ ipcs -as | grep db2inst1

IPC status from  as of Thu Aug 30 13:16:55 2001
T      ID          KEY          MODE         OWNER        GROUP
Shared Memory:
s      1900549     0x74006380   --ra-ra-ra-  db2inst1     db2grp   1
s      1310727     00000000     --ra-ra----  db2inst1     db2grp   1
s      2031624     0x73006380   --ra-ra-ra-  db2inst1     db2grp   1 

From the list above, notice that there are three semaphore segments that were not removed after executing ipclean. You must remove them manually:

$ ipcrm -s 1900549
$ ipcrm -s 1310727
$ ipcrm -s 2031624 

List all message queue segments:

$ ipcs -aq | grep db2inst1

IPC status from  as of Thu Aug 30 13:16:55 2001
T           ID         KEY         MODE         OWNER     GROUP
Shared Memory:
q           1572868    0x01dadd16  -Rrw-------  db2inst1  db2grp 65535
q           901125     0x01eba5ed  --rw-------  db2inst1  db2grp 65535
q           1609739    00000000    --rw-------  db2inst1  db2grp 65535
q           659468     00000000    -Rrw-------  db2inst1  db2grp 65535 

From the list above, notice that there are four message queue segments that were not removed after executing ipclean. You must remove them manually:

$ ipcrm -q 1572868
$ ipcrm -q 901125
$ ipcrm -q 1609739
$ ipcrm -q 659468