On Wed, 30 Nov 2005, Otto Moerbeek wrote:
>
> On Thu, 1 Dec 2005, Zoong PHAM wrote:
>
> > Hi Sean,
> >
> > On Wednesday, 30 November 2005 at 7:34:59 -0800, Sean Comeau wrote:
> > > > How can I fix that?
> >
> > My real question is "if I increased the number of semaphore, would it
> > fix the problem ?"
> > Remember the error message I have is:
> > [Thu Dec 1 01:51:19 2005] [error] mod_ssl: Parent process could not
> > create private SSLMutex semaphore (System error follows)
> > [Thu Dec 1 01:51:19 2005] [error] System: No space left on device
> > (errno: 28)
> >
> > If the fix is "increase number of metaphores", then which parameters
> > below can I increase?
>
> "Educated" guess:
>
> intro(2): errno 28 == ENOSPC
> semop(2): [ENOSPC] SEM_UNDO was requested, and there is not enough space
> left in the kernel to store the undo information.
> sysctl(3): KERN_SEMINFO_SEMMNU is used to set max number of undo structures.
>
> So you should try kern.seminfo.semmnu.
Sorry, hit send too early.
>From semget(2):
[ENOSPC] A new set of semaphores could not be created because the
system limit for the number of semaphores or the number of
semaphore sets has been reached.
So first try semmni, semmns and semmsl.
-Otto
> >
> >
> > > test:~# sysctl kern.seminfo
> > > kern.seminfo.semmni=10 # max number of semaphore identifiers (i.e.,
> > > sets)
> > > kern.seminfo.semmns=60 # max number of semaphores system-wide
> > > kern.seminfo.semmnu=30 # i'm not sure...
> > > kern.seminfo.semmsl=60 # maximum number of semaphores per set
> > > kern.seminfo.semopm=100 # not sure
> > > kern.seminfo.semume=10 # never changed this one myself
> > > kern.seminfo.semusz=100 # or this
> > > kern.seminfo.semvmx=32767 # max value of semaphore, looks good probably
> > > kern.seminfo.semaem=16384 # no idea
> > >
> > > test:~# sysctl kern.shminfo
> > > kern.shminfo.shmmax=33554432 # max size of shared memory segment (bytes)
> > > kern.shminfo.shmmin=1 # min size of shared memory segment (bytes)
> > > kern.shminfo.shmmni=128 # max number of shared memory segments
> > > system-wide
> > > kern.shminfo.shmseg=128 # max number of shared memory segments per
> > > proc
> > > kern.shminfo.shmall=8192 # total amount of shared memory available
> > > (pages)
> > >
> > > OK, I assume you know how to use /etc/sysctl.conf to increase these values
> >
> > I know how to use sysctl(8).
> >
> > Thanks,
> > Zoong
