Hi Tom!
I have been running a heavily loaded Firebird Classic 2.0 on a (Gentoo) Linux Server for about 3 years without a hitch with the following settings:
firebird.conf:
LockSemCount = 500

/etc/sysctl.conf:
kernel.shmmax = 1073741824
kernel.sem = 1024 32000 256 1024

/etc/xinetd.d/firebird:
service gds_db
{
disable = no
flags = NODELAY KEEPALIVE IPV4
socket_type = stream
wait = no
user = firebird
server = /opt/firebird/bin/fb_inet_server
cps = 0 0
instances = 1000
per_source = 300
log_type = FILE /var/log/firebird/xinetd.firebird.log
}


I had some problems in the start with the Lock Manager, before increasing the default values. Another important thing are the "instances" and "cps" settings of xinetd, which may prevent new connections under certain circumstances.

hth,
Michael

-------- Original-Nachricht --------
Betreff: [firebird-support] LockSemCount
Von: Tom Munro Glass <tom@...>
An: firebird-support@yahoogroups.com
Datum: 28.07.2009 06:35

> Running FB classic 2.1.2.18118 on Mandriva 2009 with an unmodified
> firebird.conf.
>
> I have had a corrupted database, and prior to this firebird.log contains the
> "Fatal lock manager error: semaphores are exhausted" message. The system would
> only have had one or two users connected at the time, so can someone please
> tell me what operations cause a semaphore to be used? For example is the
> number of semaphores used affected by the number of active transactions, and
> does running nbackup use any semaphores?
>
> Also, does this message mean that FB has used all of semaphores as determined
> by LockSemCount (default 32 I assume) or does it mean that Linux has run out
> of semaphores?
>
> I'm trying to determine if I need to increase the value of LockSemCount, and
> if so, what should I increase it to.
>
> Tom Munro Glass
>
>
>
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