Possible to link an IPC Sempahore to a process ID? - Page 2 - UNIX for Advanced & Expert Users

Diabolist · #8 07-10-2008

You can map the shared memory IDs with pmap, but I don't believe you can map the semaphore to a process. You can with Solaris 10 and dtrace, but not on 9.

I was thinking lsof might help, but I just tried it out and it looks like a no-go.

Here's a quote from a Tivoli doc I did a quick lookup on:

Code:

For shared memory and semaphore usage make sure that the kernel parameters of your 
system have at least the following values (minimum requirements): 
     set semsys:seminfo_semmap=50
     set semsys:seminfo_semmni=50
     set semsys:seminfo_semmns=300
     set semsys:seminfo_semmnu=150
     set semsys:seminfo_semopm=50
     set semsys:seminfo_semume=50
     set semsys:seminfo_semmsl=125

And although this was listed for HPUX, and is really old, here's is how they recommend you calculate the needed value:

Code:

semaphores = 60 + (2 x maxSessions)
Where maxSessions is the maximum number of concurrent client sessions.

Solarius · #9 08-14-2008

Thanks for the info Diabolist, might come in handy.

I got relayed some information on what caused my problem... It seems it was because of a network problem causing the TSM sessions to not closing properly and constantly reopening a new session.

To bad I wasn't able to get a more detailed technical explanation.

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