10.4.1 and shared memory
10.4.1 and shared memory
- Subject: 10.4.1 and shared memory
- From: Alexandre Mainville <email@hidden>
- Date: Sat, 28 May 2005 19:09:13 -0400
Hi,
I'm trying to port an application written in c++ and motif over to
OSX and cocoa. The app uses Sleepycat's BerkeleyDB.
Everything is working fine (especially the gui part, cocoa is great)
except for shared memory. I must be missing something really obvious
since PostgreSQL is using shared memory on the same machine without
problems.
In case it's relevant, the error I'm getting when I try to open a
environment using the DB_SYSTEM_MEM flag is: DB_RUNRECOVERY: Fatal
error, run database recovery. (That's when the system is trying to
create the environment with the DB_CREATE flag present)
I started out by editing /etc/rc to raise the default 4MB limit to
128MB and rebooted.
sysctl -w kern.sysv.shmmax=134217728 kern.sysv.shmmin=1
kern.sysv.shmmni=32 kern.sysv.shmseg=8 kern.sysv.shmall=32768
After a reboot sysctl reports everything is ok.
sysctl -a | grep shm
kern.sysv.shmmax: 134217728
kern.sysv.shmmin: 1
kern.sysv.shmmni: 32
kern.sysv.shmseg: 8
kern.sysv.shmall: 32768
but ipcs is acting up, run as a normal user it spews out impossible
numbers and run as root it reports everything as zero????
ipcs -M
shminfo:
shmmax: -1073744240 (max shared memory segment size)
shmmin: -1877554984 (min shared memory segment size)
shmmni: -1073744240 (max number of shared memory
identifiers)
shmseg: -1877555012 (max shared memory segments per
process)
shmall: -1073744224 (max amount of shared memory in pages)
sudo ipcs -M
shminfo:
shmmax: 0 (max shared memory segment size)
shmmin: 0 (min shared memory segment size)
shmmni: 0 (max number of shared memory identifiers)
shmseg: 0 (max shared memory segments per process)
shmall: 0 (max amount of shared memory in pages)
all the while PostgreSQL seems to be having no problems....
sudo ipcs -m
Shared Memory:
T ID KEY MODE OWNER GROUP
m 262143 5432001 --rw------- postgres postgres
Thanks for any help our ideas you may have
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