Damian Wiest wrote:
.........
You'll want to use either sysctl(8) to change the settings dynamically, or
use /etc/sysctl.conf to modify the settings permanently. I'm not sure if
there's a benefit to rolling a new kernel versus using sysctl.conf, or if
things even work that way anymore.
# sysctl -a | grep seminfo
kern.seminfo.semmni=10 # number of semaphore identifiers
kern.seminfo.semmns=60 # number of semaphores in system
kern.seminfo.semmnu=30 # number of undo structures in system
kern.seminfo.semmsl=60 # max number of semaphores per id
kern.seminfo.semopm=100 # max number of operations per semop call
kern.seminfo.semume=10 # max number of undo entries per process
kern.seminfo.semusz=100 # size in bytes of undo structure
kern.seminfo.semvmx=32767 # semaphore maximum value
kern.seminfo.semaem=16384 # adjust on exit max value
Those comments are from /usr/include/sys/sem.h
-Damian
Sorry, I forgot to mention a few things.
You should become familiar with ipcs(1) as it will allow you to query
the current state of SysV IPC facilities. You'll probably find yourself
manually deleting semaphores depending on how well that extension cleans
up after itself during testing.
IIRC, the kernel maintains some in-memory datastructures to keep track
of semaphores. I believe increasing the maximum number of semaphores
will take up a negligible amount of main memory.
If you're interested, the "Design and Implementation of the 4.4 BSD
Operating System" (ISBN # 0201549794) has great coverage of this stuff.
........
thanks very much all very useful info. Someone else recommended looking
at these options
kern.ipc.semmap=180
kern.ipc.semmni=160
kern.ipc.semmns=210
kern.ipc.semmnu=180
kern.ipc.semmsl=210
kern.ipc.semopm=250
kern.ipc.semume=160
kern.ipc.semusz=92
kern.ipc.semvmx=32767
kern.ipc.semaem=16384
and on my 6.1 system I see these with sysctl -a | grep ipc, however,
# sysctl -a | grep seminfo
/usr/RL_HOME/users/robin:
#
I guess they've been renamed.
--
Robin Becker
_______________________________________________
freebsd-questions@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-questions
To unsubscribe, send any mail to "[EMAIL PROTECTED]"
