Date: Sun, 26 Jun 2005 18:48:25 -0400 From: Louis LeBlanc <FreeBSD@keyslapper.net> To: freebsd-questions@freebsd.org Subject: Re: Perl 5.8.6 to 5.8.7 upgrade fails IPC tests Message-ID: <20050626224825.GB970@keyslapper.net> In-Reply-To: <20050626142104.L1638@sotec.home> References: <20050626191706.GB89575@keyslapper.net> <20050626223917.3b50913b.albi@scii.nl> <20050626205620.GC89575@keyslapper.net> <20050626142104.L1638@sotec.home>
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On 06/26/05 02:32 PM, Mikko Tyljrvi sat at the `puter and typed:
> On Sun, 26 Jun 2005, Louis LeBlanc wrote:
>=20
> > On 06/26/05 10:39 PM, albi@scii.nl sat at the `puter and typed:
> >> On Sun, 26 Jun 2005 15:17:06 -0400
> >> Louis LeBlanc <FreeBSD@keyslapper.net> wrote:
> >>
> >>> I'm having a little trouble with my perl upgrade from 5.8.6 to 5.8.7.
> >> -- cut --
> >>> ok 5
> >>> ok 6
> >>> semget: No space left on device
> >>
> >> you need to make disc-space, one idea is to run portsclean -C or to ma=
ke
> >> some more space in /usr/home
> >
> > That would be the obvious cause, but not so:
>=20
> [...]
>=20
> Indeed. Disk space most likely has nothing to do with it.
>=20
> The semget(2) call returns ENOSPC when unable to allocate semaphores,
> due to hitting one of the many SYSV IPC limitations. Some things to
> look for:
>=20
> - You need to have SYSVSEM in your kernel, or "sysvsem.ko" loaded.
>=20
> - Check semaphore limits with "ipcs -S"
>=20
> - Check current semaphore usage with "ipcs -s"
>=20
> - Figure out what limit is being hit and do something about it :-)
>=20
> Some of the values can be tweaked at run-time, with
> "sysctl kern.ipc.semxxx=3Dvalue", others have to be set at boot
> time (in /boot/loader.conf), or compiled into the kernel.
This certainly does make sense, but I'm not sure I'm actually running
short here. I have SYSVSEM in my kernel (as well as SYSVSHM and
SYSVMSG), and the relevant sysctls are:
kern.ipc.semmap: 30
kern.ipc.semmni: 10
kern.ipc.semmns: 60
kern.ipc.semmnu: 30
kern.ipc.semmsl: 60
kern.ipc.semopm: 100
kern.ipc.semume: 10
kern.ipc.semusz: 92
kern.ipc.semvmx: 32767
kern.ipc.semaem: 16384
<root># ipcs -S
seminfo:
semmap: 30 (# of entries in semaphore map)
semmni: 10 (# of semaphore identifiers)
semmns: 60 (# of semaphores in system)
semmnu: 30 (# of undo structures in system)
semmsl: 60 (max # of semaphores per id)
semopm: 100 (max # of operations per semop call)
semume: 10 (max # of undo entries per process)
semusz: 92 (size in bytes of undo structure)
semvmx: 32767 (semaphore maximum value)
semaem: 16384 (adjust on exit max value)
<root># ipcs -s
Semaphores:
T ID KEY MODE OWNER GROUP
s 65536 5432001 --rw------- pgsql pgsql
s 65537 5432002 --rw------- pgsql pgsql
s 65538 5432003 --rw------- pgsql pgsql
Near as I can tell, this tells me I have at least 60 semaphores
systemwide, 60 per id, 3 in use, none of which are being used by root
(which is who I am running the test as). Shouldn't that leave 57 for
the perl tests? How many does it need to open?
Lou
--=20
Louis LeBlanc FreeBSD-at-keyslapper-DOT-net
Fully Funded Hobbyist, KeySlapper Extrordinaire :)
Please send off-list email to: leblanc at keyslapper d.t net
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Coronation, n.:
The ceremony of investing a sovereign with the outward and visible
signs of his divine right to be blown skyhigh with a dynamite bomb.
-- Ambrose Bierce, "The Devil's Dictionary"
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