Shared memory segments

Neven1986 · 12-09-2013, 10:17 AM

Hello guys,

I have one question regarding shared memory segments, as I need to set this on my new Linux server.

In Unix (Solaris 10) there is possibility to set the number of shared memory segments to lets say 50, like this:

Code:

prctl -n project.max-shm-ids -r -v 50 -i project default

and you can retrieve this information by issuing:

Code:

prctl -n project.max-shm-ids -i project default

But, I'm unable to find this kind of option in Linux (CentOS 6.4).
Is there even possibility to do this in Linux?

I know that you can set the shmmax parameter, but I think this is not what I'm looking for.

Thank you in advance

sag47 · 12-09-2013, 10:55 AM

Hmm, what about a combination of shmall and shmmax? One could limit the amount of segments that way? Just a shot in the dark. Searching shared memory segment in the Kernel documentation yields the following results.

Code:

$ grep -irl 'shared memory segment' Documentation
Documentation/isdn/README.sc
Documentation/vm/numa_memory_policy.txt
Documentation/vm/hugetlbpage.txt
Documentation/sysctl/kernel.txt
Documentation/sysctl/vm.txt
Documentation/unshare.txt
Documentation/filesystems/xip.txt
Documentation/filesystems/proc.txt
Documentation/security/credentials.txt

Neven1986 · 12-09-2013, 04:50 PM

Quote:

Originally Posted by sag47

Hmm, what about a combination of shmall and shmmax? One could limit the amount of segments that way? Just a shot in the dark. Searching shared memory segment in the Kernel documentation yields the following results.

Code:

$ grep -irl 'shared memory segment' Documentation
Documentation/isdn/README.sc
Documentation/vm/numa_memory_policy.txt
Documentation/vm/hugetlbpage.txt
Documentation/sysctl/kernel.txt
Documentation/sysctl/vm.txt
Documentation/unshare.txt
Documentation/filesystems/xip.txt
Documentation/filesystems/proc.txt
Documentation/security/credentials.txt

Thank you very much for response. It seems that I'll need to look into documentation.
I thought maybe someone knows this by heart and has experience in both worlds with following.