Re: How to PERMANENTLY set semaphores in Linux

From: <linuxquestion_at_yahoo.com>
Date: 21 Nov 2003 09:56:03 -0800
Message-ID: <672ceaed.0311210956.f671445@posting.google.com>

Here is an update.

I created a file to change the shmmax upon startup, that will echo info to bootlog.txt.

boot_shmmax:

#! /bin/sh

# File to set shmmax during boot.

echo "Setting size for /proc/sys/kernel/shmmax" echo ` expr 2048 \* 1024 \* 1024 ` > /proc/sys/kernel/shmmax echo "Value for shmmax is now: `cat /proc/sys/kernel/shmmax` "

echo ` date `  >>  				/etc/init.d/bootlog.txt
echo "start:  /etc/rc.d/boot_shmmax" 	>>  	/etc/init.d/bootlog.txt
echo "runlevel is:  `  runlevel  `" 	>>  	/etc/init.d/bootlog.txt
echo "Value for shmmax is now:  `cat /proc/sys/kernel/shmmax` "  >> 
	/etc/init.d/bootlog.txt
echo "end:  /etc/rc.d/boot_shmmax" 	>>  	/etc/init.d/bootlog.txt
echo "   "  				>>  /etc/init.d/bootlog.txt

and created the run level links:

ln -s /etc/init.d/boot_shmmax /etc/init.d/rc3.d/S01boot_shmmax ln -s /etc/init.d/boot_shmmax /etc/init.d/rc5.d/S01boot_shmmax

I also changed: /proc/sys/kernel/shmmax

cat /proc/sys/kernel/shmmax
2147483648

Edit /etc/init.d/boot.local. Add:
sysctl -p

Reboot.

cat /proc/sys/kernel/shmmax
33554432

still not changed on boot

bootlog.txt says:

Sat Nov 15 01:12:35 EST 2003
start: /etc/init.d/boot.local
runlevel is: unknown
Value for shmmax is now: 33554432
end: /etc/init.d/boot.local

Sat Nov 15 01:12:38 EST 2003
start: /etc/rc.d/boot_shmmax
runlevel is: N 5
Value for shmmax is now: 33554432
end: /etc/rc.d/boot_shmmax

At boot time, run level 3 is unknown.
Then, even though run level 5 is found, the shmmax still does not change.

/var/log/boot.msg:

Creating /var/log/boot.msg

done<notice>killproc: kill(30,29)
Running /etc/init.d/boot.local

/etc/init.d/boot.local: line 22: /proc/sys/kernel/shmmax : No such file or directory

Value for shmmax is now: 33554432

done<notice>killproc: kill(30,3)

.......

<notice>/etc/init.d/rc5.d/S01boot_shmmax start Setting size for /proc/sys/kernel/shmmax

/etc/init.d/rc5.d/S01boot_shmmax: line 6: /proc/sys/kernel/shmmax : No such file or directory

Value for shmmax is now: 33554432

<notice>'/etc/init.d/rc5.d/S01boot_shmmax start' exits with status 0

At boot, the file: /proc/sys/kernel/shmmax isn't even found.

Any more ideas on how to set the shmmax at boot time?

Thanks

linuxquestion_at_yahoo.com wrote in message news:<672ceaed.0311130005.5b8bddcf_at_posting.google.com>...

> HI all,
> 
> I'm using:  Linux Suse personal edition 8.2 
> 
> I am using the dbca with Oracle 9.2.  It keeps 
> running out of memory with the ora-27123 error.
> 
> As the docs said, I did this:
> 
> echo `expr 2048 \* 1024 \* 1024` > /proc/sys/kernel/shmmax
> 
> cat /proc/sys/kernel/shmmax
> 2147483648
> 
> reboot
> 
> ---------------
> 
> But, then I got the same symptom.  
> I checked the file. 
> 
> cat /proc/sys/kernel/shmmax
> 33554432
> 
> So, it didn't keep the value!!!
> 
> 
> ipcs -l
> 
> ------ Shared Memory Limits --------
> max number of segments = 4096
> max seg size (kbytes) = 32768
> max total shared memory (kbytes) = 8388608
> min seg size (bytes) = 1
> 
> ------ Semaphore Limits --------
> max number of arrays = 1024
> max semaphores per array = 250
> max semaphores system wide = 256000
> max ops per semop call = 32
> semaphore max value = 32767
> 
> ------ Messages: Limits --------
> max queues system wide = 128
> max size of message (bytes) = 8192
> default max size of queue (bytes) = 16384
> 
> 
> In Solaris, this was easy.  Edit the file:
> /etc/system
> and reboot.  The values stayed there forever.
> 
> But how to do this in Suse, and make it stick?  
> 
> I don't want to put this in some script, so they
> get changed while booting, and add yet another
> layer of complexity. 
> 
> Thanks

Received on Fri Nov 21 2003 - 11:56:03 CST

Re: How to PERMANENTLY set semaphores in Linux - Suse Personal Edition 8.2?