āĻ¨āĻŋāĻŦāĻ¨ā§āĻ§āĻāĻŋāĻ° āĻ
āĻ¨ā§āĻŦāĻžāĻĻ āĻā§āĻ°ā§āĻ¸ āĻļā§āĻ°ā§āĻ° āĻĒā§āĻ°āĻžāĻā§āĻāĻžāĻ˛ā§ āĻĒā§āĻ°āĻ¸ā§āĻ¤ā§āĻ¤ āĻāĻ°āĻž āĻšāĻ¯āĻŧā§āĻāĻŋāĻ˛
āĻāĻāĻāĻŋ āĻ¸ā§āĻŽāĻžāĻĢā§āĻ° āĻšāĻ˛ āĻāĻŽāĻ¨ āĻāĻāĻāĻŋ āĻĒā§āĻ°āĻā§āĻ°āĻŋāĻ¯āĻŧāĻž āĻ¯āĻž āĻĒā§āĻ°āĻ¤āĻŋāĻ¯ā§āĻā§ āĻĒā§āĻ°āĻā§āĻ°āĻŋāĻ¯āĻŧāĻž āĻāĻŦāĻ āĻĨā§āĻ°ā§āĻĄāĻā§āĻ˛āĻŋāĻā§ āĻ¸āĻāĻ¸ā§āĻĨāĻžāĻ¨āĻā§āĻ˛āĻŋ āĻāĻžāĻ āĻāĻ°ā§ āĻ¨ā§āĻāĻ¯āĻŧāĻžāĻ° āĻ āĻ¨ā§āĻŽāĻ¤āĻŋ āĻĻā§āĻ¯āĻŧ āĻāĻŦāĻ āĻŦāĻŋāĻāĻŋāĻ¨ā§āĻ¨ āĻ¸āĻŋāĻā§āĻā§āĻ°ā§āĻ¨āĻžāĻāĻā§āĻļāĻ¨ āĻ¸āĻŽāĻ¸ā§āĻ¯āĻž āĻ¯ā§āĻŽāĻ¨ āĻ°ā§āĻ¸, āĻĄā§āĻĄāĻ˛āĻ (āĻĒāĻžāĻ°āĻ¸ā§āĻĒāĻ°āĻŋāĻ āĻ˛āĻ) āĻāĻŦāĻ āĻĻā§āĻ°ā§āĻŦā§āĻ¯āĻŦāĻšāĻžāĻ°āĻāĻžāĻ°ā§ āĻĨā§āĻ°ā§āĻĄāĻā§āĻ˛āĻŋāĻ° āĻ¸āĻžāĻĨā§ āĻ¸āĻžāĻšāĻžāĻ¯ā§āĻ¯ āĻāĻ°ā§āĨ¤
āĻāĻ āĻ¸āĻŽāĻ¸ā§āĻ¯āĻžāĻā§āĻ˛āĻŋ āĻ¸āĻŽāĻžāĻ§āĻžāĻ¨ āĻāĻ°āĻžāĻ° āĻāĻ¨ā§āĻ¯, āĻāĻžāĻ°ā§āĻ¨ā§āĻ˛ āĻŽāĻŋāĻāĻā§āĻā§āĻ¸, āĻ¸ā§āĻŽāĻžāĻĢā§āĻ°, āĻ¸āĻāĻā§āĻ¤ āĻāĻŦāĻ āĻŦāĻžāĻ§āĻžāĻā§āĻ˛āĻŋāĻ° āĻŽāĻ¤ā§ āĻ¸āĻ°āĻā§āĻāĻžāĻŽ āĻ¸āĻ°āĻŦāĻ°āĻžāĻš āĻāĻ°ā§āĨ¤
āĻ¤āĻŋāĻ¨ āĻ§āĻ°āĻ¨ā§āĻ° āĻ¸ā§āĻŽāĻžāĻĢā§āĻ° āĻāĻā§:
- āĻŦāĻžāĻāĻ¨āĻžāĻ°āĻŋ āĻ¸ā§āĻŽāĻžāĻĢā§āĻ°
- Semaphores-āĻāĻžāĻāĻ¨ā§āĻāĻžāĻ° (āĻ¸ā§āĻŽāĻžāĻĢā§āĻ° āĻāĻŖāĻ¨āĻž)
- āĻ¸ā§āĻŽāĻžāĻĢā§āĻ°ā§āĻ° āĻ ā§āĻ¯āĻžāĻ°ā§ (āĻ¸ā§āĻŽāĻžāĻĢā§āĻ° āĻ¸ā§āĻ)
āĻāĻāĻĒāĻŋāĻ¸āĻŋ āĻ¸ā§āĻā§āĻ¯āĻžāĻāĻžāĻ¸ āĻĻā§āĻā§āĻ¨
āĻ¨āĻŋāĻŽā§āĻ¨āĻ˛āĻŋāĻāĻŋāĻ¤ āĻāĻŽāĻžāĻ¨ā§āĻĄāĻā§āĻ˛āĻŋ āĻāĻ¨ā§āĻ¤āĻāĻĒā§āĻ°āĻā§āĻ°āĻŋāĻ¯āĻŧāĻž āĻ¯ā§āĻāĻžāĻ¯ā§āĻā§āĻ° āĻŦāĻ°ā§āĻ¤āĻŽāĻžāĻ¨ āĻ āĻŦāĻ¸ā§āĻĨāĻž (IPC) āĻ¸āĻŽā§āĻĒāĻ°ā§āĻā§ āĻ¤āĻĨā§āĻ¯ āĻĒā§āĻ°āĻĻāĻžāĻ¨ āĻāĻ°ā§āĨ¤
# ipcs
------ Shared Memory Segments --------
key shmid owner perms bytes nattch status
0x00000000 65536 root 600 393216 2 dest
0x00000000 98305 root 600 393216 2 dest
0x00000000 131074 root 600 393216 2 dest
0x00000000 163843 root 600 393216 2 dest
0x00000000 196612 root 600 393216 2 dest
0x00000000 229381 root 600 393216 2 dest
0x00000000 262150 root 600 393216 2 dest
0x00000000 294919 root 600 393216 2 dest
0x00000000 327688 root 600 393216 2 dest
------ Semaphore Arrays --------
key semid owner perms nsems
------ Message Queues --------
key msqid owner perms used-bytes messages
āĻ¸ā§āĻŽāĻžāĻĢā§āĻ°ā§āĻ° āĻ¸āĻā§āĻ°āĻŋāĻ¯āĻŧ āĻ ā§āĻ¯āĻžāĻ°ā§
āĻ¸āĻā§āĻ°āĻŋāĻ¯āĻŧ āĻ¸ā§āĻŽāĻžāĻĢā§āĻ° āĻ ā§āĻ¯āĻžāĻ°ā§ āĻ¸āĻŽā§āĻĒāĻ°ā§āĻā§ āĻ¤āĻĨā§āĻ¯ āĻĒā§āĻ°āĻĻāĻ°ā§āĻļāĻ¨ āĻāĻ°ā§āĻ¨āĨ¤
# ipcs -s
------ Semaphore Arrays --------
key semid owner perms nsems
āĻāĻžāĻ āĻāĻ°āĻž āĻŽā§āĻŽāĻ°āĻŋ āĻ āĻāĻļ
āĻ¸āĻā§āĻ°āĻŋāĻ¯āĻŧ āĻāĻžāĻ āĻāĻ°āĻž āĻŽā§āĻŽāĻ°āĻŋ āĻŦāĻŋāĻāĻžāĻ āĻ¸āĻŽā§āĻĒāĻ°ā§āĻā§ āĻ¤āĻĨā§āĻ¯ āĻĻā§āĻā§āĻ¨āĨ¤
# ipcs -m
------ Shared Memory Segments --------
key shmid owner perms bytes nattch status
0x00000000 65536 root 600 393216 2 dest
0x00000000 98305 root 600 393216 2 dest
āĻ¸ā§āĻŽāĻžāĻŦāĻĻā§āĻ§āĻ¤āĻž
āĻā§āĻŽ ipcs -l
āĻļā§āĻ¯āĻŧāĻžāĻ° āĻāĻ°āĻž āĻŽā§āĻŽāĻ°āĻŋ, āĻ¸ā§āĻŽāĻžāĻĢā§āĻ° āĻāĻŦāĻ āĻŦāĻžāĻ°ā§āĻ¤āĻž āĻ¸ā§āĻŽāĻž āĻĒā§āĻ°āĻĻāĻ°ā§āĻļāĻ¨ āĻāĻ°ā§āĨ¤
# ipcs -l
------ Shared Memory Limits --------
max number of segments = 4096
max seg size (kbytes) = 4194303
max total shared memory (kbytes) = 1073741824
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 = 16
max size of message (bytes) = 65536
default max size of queue (bytes) = 65536
āĻāĻžāĻ āĻāĻ°āĻž āĻŽā§āĻŽāĻ°āĻŋ
āĻ¨ā§āĻā§āĻ° āĻāĻŽāĻžāĻ¨ā§āĻĄāĻāĻŋ āĻļā§āĻ¯āĻŧāĻžāĻ° āĻāĻ°āĻž āĻŽā§āĻŽāĻ°āĻŋ āĻĒā§āĻ°āĻĻāĻ°ā§āĻļāĻ¨ āĻāĻ°ā§āĨ¤
# ipcs -m
------ Shared Memory Segments --------
key shmid owner perms bytes nattch status
0x00000000 65536 root 600 393216 2 dest
0x00000000 98305 root 600 393216 2 dest
0x00000000 131074 root 600 393216 2 dest
0x00000000 163843 root 600 393216 2 dest
0x00000000 196612 root 600 393216 2 dest
0x00000000 229381 root 600 393216 2 dest
0x00000000 262150 root 600 393216 2 dest
0x00000000 294919 root 600 393216 2 dest
0x00000000 327688 root 600 393216 2 dest
āĻ¸āĻŽā§āĻĒāĻĻ āĻ¨āĻŋāĻ°ā§āĻŽāĻžāĻ¤āĻžāĻ°āĻž
āĻāĻŽāĻžāĻ¨ā§āĻĄāĻāĻŋ āĻ°āĻŋāĻ¸ā§āĻ°ā§āĻ¸ā§āĻ° āĻŽāĻžāĻ˛āĻŋāĻ āĻāĻŦāĻ āĻ¸ā§āĻ°āĻˇā§āĻāĻžāĻ° āĻŦā§āĻ¯āĻŦāĻšāĻžāĻ°āĻāĻžāĻ°ā§ āĻāĻŦāĻ āĻā§āĻˇā§āĻ ā§ āĻĒā§āĻ°āĻĻāĻ°ā§āĻļāĻ¨ āĻāĻ°ā§āĨ¤
# ipcs -m -c
------ Shared Memory Segment Creators/Owners --------
shmid perms cuid cgid uid gid
65536 600 root root root root
98305 600 root root root root
131074 600 root root root root
163843 600 root root root root
196612 600 root root root root
229381 600 root root root root
262150 600 root root root root
294919 600 root root root root
327688 600 root root root root
āĻāĻāĻĒāĻŋāĻ¸āĻŋ āĻā§āĻ˛ āĻŦā§āĻ¯āĻŦāĻšāĻžāĻ° āĻāĻ°ā§
āĻ¨ā§āĻā§āĻ° āĻāĻĻāĻžāĻšāĻ°āĻŖā§, āĻĒā§āĻ¯āĻžāĻ°āĻžāĻŽāĻŋāĻāĻžāĻ° -u
āĻ¸āĻŽāĻ¸ā§āĻ¤ IPC āĻā§āĻ˛ā§āĻ° āĻŦā§āĻ¯āĻŦāĻšāĻžāĻ°ā§āĻ° āĻ¸āĻžāĻ°āĻ¸āĻāĻā§āĻˇā§āĻĒ āĻĒā§āĻ°āĻĻāĻ°ā§āĻļāĻ¨ āĻāĻ°ā§āĨ¤
# ipcs -u
------ Shared Memory Status --------
segments allocated 9
pages allocated 864
pages resident 477
pages swapped 0
Swap performance: 0 attempts 0 successes
------ Semaphore Status --------
used arrays = 0
allocated semaphores = 0
------ Messages: Status --------
allocated queues = 0
used headers = 0
used space = 0 bytes
āĻ¯āĻāĻ¨ āĻĒāĻ°āĻŋāĻˇā§āĻŦāĻžāĻā§āĻ˛āĻŋ āĻŦāĻ¨ā§āĻ§ āĻāĻ°āĻž āĻšāĻ¯āĻŧ, āĻ¸ā§āĻŽāĻžāĻĢā§āĻ° āĻāĻŦāĻ āĻāĻžāĻ āĻāĻ°āĻž āĻŽā§āĻŽāĻ°āĻŋ āĻŦāĻŋāĻāĻžāĻāĻā§āĻ˛āĻŋāĻ āĻŽā§āĻā§ āĻĢā§āĻ˛āĻ¤ā§ āĻšāĻŦā§ā§ˇ āĻ¯āĻĻāĻŋ āĻ¸ā§āĻā§āĻ˛āĻŋ āĻ¸āĻ°āĻžāĻ¨ā§ āĻ¨āĻž āĻšāĻ¯āĻŧ, āĻ¤āĻžāĻšāĻ˛ā§ āĻāĻāĻĒāĻŋāĻ¸āĻŋāĻāĻ°āĻāĻŽ āĻāĻŽāĻžāĻ¨ā§āĻĄ āĻŦā§āĻ¯āĻŦāĻšāĻžāĻ° āĻāĻ°ā§ āĻāĻāĻĒāĻŋāĻ¸āĻŋ āĻ āĻŦāĻā§āĻā§āĻā§āĻ° āĻļāĻ¨āĻžāĻā§āĻ¤āĻāĻžāĻ°ā§āĻā§ āĻĒāĻžāĻ¸ āĻāĻ°ā§ āĻāĻāĻŋ āĻāĻ°āĻž āĻ¯ā§āĻ¤ā§ āĻĒāĻžāĻ°ā§āĨ¤
# ipcs -a
# ipcrm -s < sem id>
āĻāĻĒāĻ¨āĻŋ āĻŦā§āĻ¯āĻŦāĻšāĻžāĻ° āĻāĻ°ā§ semaphore āĻ¸ā§āĻŽāĻž āĻĒāĻ°āĻŋāĻŦāĻ°ā§āĻ¤āĻ¨ āĻāĻ°āĻ¤ā§ āĻĒāĻžāĻ°ā§āĻ¨ sysctl
.
# /sbin/sysctl -w kernel.sem=250
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