:: How to check semaphores
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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
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/sbin/sysctl -a | grep sem
kernel.sem = 250 256000 32 1024 |
:: How to increase semaphores on Linux
+ Live and temporary (gone after reboot)
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sysctl -w kernel.sem=500
kernel.sem = 500
/sbin/sysctl -a | grep sem
kernel.sem = 500 256000 32 1024 |
+ Persist
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vi /etc/sysctl.conf
## add this line
kernel.sem = 500 |