Information on SystemV IPC and POSIX IPC

Issue

• How to analysis shared memory usage?
• POSIX IPC
  • How is "/dev/shm" created and how can I modify its size?
  • What is the role of "/dev/shm?"
• SystemV IPC
  • What is the impact of configuring the below settings in sysctl.conf on the system?

kernel.shmall
kernel. shmmax
kernel.shmmni

• Where can usage be monitored after configuring the above settings in sysctl.conf?

• Are these settings related to "/dev/shm"?

  • The 'ipcs' command you mentioned doesn't seem to provide accurate usage statistics. How can I check usage statistics accurately?

  • You mentioned that kernel parameter settings are for sysvipc, and /dev/shm is for posix. Is my understanding correct?