IPC介绍——10个ipcs例子
semaphorearrays2010performancesystemaccess
ipcs是一个uinx/linux的命令。用于报告系统的消息队列、信号量、共享内存等
1、列出所有的ipcs参数： -a
他是默认选项及ipcs等效于ipcs -a
[root@test ~]# ipcs -a
------ Shared Memory Segments --------
key shmid owner perms bytes nattch status
0x00000000 0 root 644 52 2
0x00000000 32769 root 644 16384 2
0x00000000 65538 root 644 268 2
------ Semaphore Arrays --------
key semid owner perms nsems
0x00000000 0 root 600 1
0x00000000 98305 root 600 1
0x000000a7 131074 root 600 1
------ Message Queues --------
key msqid owner perms used-bytes messages
2、列出进程中的消息队列： -q
当前范例中为空
[root@test ~]# ipcs -q
------ Message Queues --------
key msqid owner perms used-bytes messages
3、列出所有的信号量： -s
[root@test ~]# ipcs -s
------ Semaphore Arrays --------
key semid owner perms nsems
0x00000000 0 root 600 1
0x00000000 98305 root 600 1
0x000000a7 131074 root 600 1
4、列出所有的共享内存信息： -m
[root@test ~]# ipcs -m
------ Shared Memory Segments --------
key shmid owner perms bytes nattch status
0x00000000 0 root 644 52 2
0x00000000 32769 root 644 16384 2
0x00000000 65538 root 644 268 2
5、要列出进程更详细信息： -i+pid
[root@test ~]# ipcs -m -i 32769
Shared memory Segment shmid=32769
uid=0 gid=0 cuid=0 cgid=0
mode=0644 access_perms=0644
bytes=16384 lpid=1051 cpid=1047 nattch=2
att_time=Fri Aug 13 09:10:30 2010
det_time=Fri Aug 13 09:10:30 2010
change_time=Fri Aug 13 09:10:30 2010
6、列出系统中的限额： -l（列出全部，也可指定要查看的限额）
[root@test ~]# ipcs -l
------ Shared Memory Limits --------
max number of segments = 4096
max seg size (kbytes) = 32768
max total shared memory (kbytes) = 8388608
min seg size (bytes) = 1
------ Semaphore Limits --------
max number of arrays = 128
max semaphores per array = 250
max semaphores system wide = 32000
max ops per semop call = 32
semaphore max value = 32767
------ Messages: Limits --------
max queues system wide = 998
max size of message (bytes) = 8192
default max size of queue (bytes) = 16384
7、列出创建者以及属主的uid和gid： -c
[root@test ~]# ipcs -c
------ Shared Memory Segment Creators/Owners --------
shmid perms cuid cgid uid gid
0 644 root root root root
32769 644 root root root root
65538 644 root root root root
------ Semaphore Arrays Creators/Owners --------
semid perms cuid cgid uid gid
0 600 root root root root
98305 600 root root root root
131074 600 root root root root
------ Message Queues: Creators/Owners --------
msqid perms cuid cgid uid gid
8、列出最后的访问时间： -t
[root@test ~]# ipcs -t
------ Shared Memory Attach/Detach/Change Times --------
shmid owner attached detached changed
0 root Aug 13 09:10:30 Aug 13 09:10:30 Aug 13 09:10:30
32769 root Aug 13 09:10:30 Aug 13 09:10:30 Aug 13 09:10:30
65538 root Aug 13 09:10:30 Aug 13 09:10:30 Aug 13 09:10:30
------ Semaphore Operation/Change Times --------
semid owner last-op last-changed
0 root Fri Aug 13 09:10:19 2010 Fri Aug 13 09:10:16 2010
98305 root Fri Aug 13 09:10:24 2010 Fri Aug 13 09:10:20 2010
131074 root Fri Aug 13 09:10:32 2010 Fri Aug 13 09:10:30 2010
------ Message Queues Send/Recv/Change Times --------
msqid owner send recv change
9、列出创建者和对应的进程id： -p
[root@test ~]# ipcs -p
------ Shared Memory Creator/Last-op --------
shmid owner cpid lpid
0 root 1047 1051
32769 root 1047 1051
65538 root 1047 1051
10、列出当前的使用状况： -u
[root@test ~]# ipcs -u
------ Shared Memory Status --------
segments allocated 3
pages allocated 6
pages resident 6
pages swapped 0
Swap performance: 0 attempts 0 successes
------ Semaphore Status --------
used arrays = 3
allocated semaphores = 3
------ Messages: Status --------
allocated queues = 0
used headers = 0
used space = 0 bytes
转载自：http://blog.csdn.net/i_am_jojo/article/details/7697155
也可参考http://blog.csdn.net/henulwj/article/details/8181957
