$ sudo ps -ef |grep 3994451
postgres 3994451 3994102  0 Apr21 ?        00:00:23 pgpool: worker process

$ sudo ipcs -s

------ Semaphore Arrays --------
key        semid      owner      perms      nsems




$ ipcs -a

------ Message Queues --------
key        msqid      owner      perms      used-bytes   messages

------ Shared Memory Segments --------
key        shmid      owner      perms      bytes      nattch     status
0x00000000 32816      postgres   600        158951464  309
0x00000000 32817      postgres   600        1680       3
0x00000000 32818      postgres   600        1          1
0x00041050 32819      postgres   600        56         6

------ Semaphore Arrays --------
key        semid      owner      perms      nsems