Date: Fri, 11 Feb 2000 11:41:45 -0500 (EST) From: Brian Dean <brdean@unx.sas.com> To: Andrey Novikov <novikov@webclub.ru> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: Tuning up semaphores in kernel Message-ID: <200002111641.LAA48618@dean.pc.sas.com> In-Reply-To: <00021114101000.00662@newbee.web2000.ru> from Andrey Novikov at "Feb 11, 2000 02:01:49 pm"
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Take a look at:
sys/conf/param.c:
/*
* Values in support of System V compatible semaphores.
*/
#ifdef SYSVSEM
struct seminfo seminfo = {
SEMMAP, /* # of entries in semaphore map */
SEMMNI, /* # of semaphore identifiers */
SEMMNS, /* # of semaphores in system */
SEMMNU, /* # of undo structures in system */
SEMMSL, /* max # of semaphores per id */
SEMOPM, /* max # of operations per semop call */
SEMUME, /* max # of undo entries per process */
SEMUSZ, /* size in bytes of undo structure */
SEMVMX, /* semaphore maximum value */
SEMAEM /* adjust on exit max value */
};
#endif
You probably want to increase either SEMMNI or SEMMNS.
Andrey Novikov wrote:
> Resently my PostgreSQL daemon died with:
> IpcSemaphoreCreate: semget failed (No space left on device) key=5432015, num=16, permission=600
>
> I figured out that the kernel is out of available semaphores,
> I wanted to rebuild it but the problem is that the options
> related to semaphores are not documented. This is the mission
> critical commercial server so I don't want just to make assumptions.
> Can you please tell me how these all enigmatic numbers are
> properly choosed:
> options SEMMAP=31
> options SEMMNI=11
> options SEMMNS=61
> options SEMMNU=31
> options SEMMSL=61
> options SEMOPM=101
> options SEMUME=11
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