:: How to check semaphores
ipcs -a ------ Shared Memory Segments -------- key shmid owner perms bytes nattch status ------ Semaphore Arrays -------- key semid owner perms nsems 0x00000000 65536 daemon 600 1 0x00000000 98305 daemon 600 1 ------ Message Queues -------- key msqid owner perms used-bytes messages
:: How to check the value of semaphores on Linux
/sbin/sysctl -a | grep sem kernel.sem = 250 256000 32 1024
:: How to increase semaphores on Linux
+ Live and temporary (gone after reboot)
sysctl -w kernel.sem=500 kernel.sem = 500 /sbin/sysctl -a | grep sem kernel.sem = 500 256000 32 1024
+ Persist
vi /etc/sysctl.conf ## add this line kernel.sem = 500 256000 32 1024
