Technical Diary - With Andrii Grytsenko

Here is short trick how to clean the shared memory up in Solaris OS.

Here is short info about the host(solaris 5.9, arch sparc):

uname -a
SunOS hostname1 5.9 Generic_118558-25 sun4u sparc SUNW,Sun-Fire-V890 Solaris

To see all shared memory segment, use ipcs

user1@~>ipcs -m -a
IPC status from  as of Wed Mar 10 16:26:20 CET 2010
T         ID      KEY        MODE        OWNER    GROUP  CREATOR   CGROUP NATTCH      SEGSZ  CPID  LPID   ATIME    DTIME    CTIME
Shared Memory:
m       4608   0x5efaa728 --rw-r-----   oracle oinstall   oracle oinstall     23 3992993792  5720 18925 16:24:47 16:24:47 11:59:42
m    5246977   0x517b6233 --rw-r--r-- user1   os_int user1   os_int     32    7352048 10685 16417 16:21:26 16:21:26 16:13:35
m    1969154   0x22b80b3e --rw-r--r-- user1   os_int user1   os_int      3   72552448 10689 11443 16:14:19 16:13:51 16:13:37
m    1967619   0x1b68b6e6 --rw-r--r-- user1   os_int user1   os_int      8  438326272 10689 16417 16:21:26 16:21:26 16:13:38
m    1966084   0x5724f977 --rw-r--r-- user1   os_int user1   os_int     14  212926464 10689 11379 16:14:27 16:13:50 16:13:40
m    1966085   0x534aab2a --rw-r--r-- user1   os_int user1   os_int     10  216572928 10689 11442 16:14:38 16:13:51 16:13:42
m   11391045   0x7bfc552e --rw-r--r-- user2   os_int user2   os_int      0    7352048  8047  9445 14:43:22 14:43:40 13:41:22
m   10461766   0x63fcba9b --rw-r--r-- user2   os_int user2   os_int      0   72552448  8114  9457 14:43:22 14:43:38 13:41:25
m    9721415   0x5cad6643 --rw-r--r-- user2   os_int user2   os_int      0  583097344  8114  9459 14:43:22 14:43:38 13:41:27
m    9655368   0x1869a8d4 --rw-r--r-- user2   os_int user2   os_int      0  212926464  8114  9466 14:43:22 14:43:38 13:41:29
m    9753673   0x148f5a87 --rw-r--r-- user2   os_int user2   os_int      0  216572928  8114  9473 14:43:22 14:43:38 13:41:31

To delete/destroy/remove any segment of the shared memory, use ipcrm. You can specify segment by shmkey(3-rd field in ipcs output) or by shmid(2-nd field) use -M and -m accordingly . Like :

ipcrm -m 4608

or

ipcrm -M 0x5efaa728

To remove all segment in shared memory where owner is user1, run

ipcs -m -a | awk '{if($5 ~ /user1/ && $1 ~ /m/) print "ipcrm -m "$2;}' | bash

END.