Re: Semaphores on scounix
In article <8aheNIAK1OfzEwLb@smooth1.demon.co.uk>, David Williams <djw@smooth1.demon.co.uk> wrote: > > In article <5lfv6a$ddp$1@polo.iquest.com>, Randy Harbison > <rdharbis@vespucci.iquest.com> writes > >We are having an ongoing problem with our ATS machine locking up. > >Each time this occurs, it appears that the semaphores appear as > >shown below. I would like to either eliminate or charge this area > >as being associated with the problem. All responses are appreciated. > > > >$ipcs > >IPC status from /dev/kmem as of Thu May 15 15:35:18 1997 > >T ID KEY MODE OWNER GROUP > >Message Queues: > >Shared Memory: > >m 0 0x52564801 --rw-rw---- informix informix > >m 401 0x0000faee --rw-rw-rw- informix root > >m 2 0x0000faff --rw-rw-rw- informix root > >m 32003 0x0000fadd --rw-rw-rw- informix informix > >Semaphores: > >s 0 0x52564801 --ra-ra---- informix informix > >s 1 0x52564802 --ra-ra---- informix informix > >s 2 0x52564803 --ra-ra---- informix informix > >s 3 0x52564804 --ra-ra---- informix informix > >s 4 0x52564805 --ra-ra---- informix informix > >s 5 0x52564806 --ra-ra---- informix informix > >s 6 0x52564807 --ra-ra---- informix informix > >s 7 0x52564808 --ra-ra---- informix informix > >s 8 0x52564809 --ra-ra---- informix informix > >s 9 0x5256480a --ra-ra---- informix informix > >s 10 0x5256480b --ra-ra---- informix informix > >s 11 0x5256480c --ra-ra---- informix informix > >s 12 0x5256480d --ra-ra---- informix informix > >s 13 0x5256480e --ra-ra---- informix informix > >s 14 0x5256480f --ra-ra---- informix informix > >s 15 0x52564810 --ra-ra---- informix informix > >s 13 0x00000000 --ra------- lookatdb informix | This appears > >s 14 0x00000000 --ra------- lookatdb informix | very > >s 15 0x00000000 --ra------- lookatdb informix | suspicious > > > > > > > >Randall D. Harbison > >Intergraph Corpration > >rdharbis@ingr.com > >rdharbis@iquest.com > > > > Which version(s) of Online are you running? The last semaphore look > like the application itself is using semaphores outside of Informix. I think that it is most probably OnLine 5.0x or 4.0x - only one Informix OnLine shared memory segment. The last three semaphore sets could belong to SCO Open Desktop Window environment (I forget exact name of these strange windows) > > Try increasing the number of semaphores in the kernel parameters... > Use ipcs -sa to get number of semaphores in sets. Check USERS in tbconfig file - in OnLine 5.0x each configured user including internal OnLine processes tbinit, tbpgcl, tbundo has one semaphore. Check SEMMSL kernel parameter -maximum number of semaphores in set. I suppose that SEMMSL is set too low. But - your instance works, just a little bit more work for kernel with semaphore sets. Regards, Miroslav Lorenc SSA Czech Republlic -------------------==== Posted via Deja News ====----------------------- http://www.dejanews.com/ Search, Read, Post to Usenet