shared memory question

[stu78]

Hi all,

My question is as follows;

I need to do is tune the shared memory segments on the solaris system - such as the;

shmsys:shminfo_shmmax
semsys:seminfo_semmnu

located in /etc/system

However since this is a heavily used system I do not wish to reboot the server unless necessary. Is there any other options to tune these shared memory segments without rebooting the box.

Thanks for any ideas / help.

 

[AHinMaine]

I think you'd need to use the adb command. Obviously that's a pretty significant thing to tweak in production, so your results may be unpredictable. This script might help you to figure it out. I didn't write it, I got it off of some solaris tuning site that was probably referenced on sean.de.

-Andy

ak.sh

#!/bin/sh
# script to get predefined kernel tunables
cat << EFF | adb -k /dev/ksyms /dev/mem |   awk '/^[a-z_-]+:/ { 	if (!i) { i++; next } 	if ($2) { printf &quot; %-20s %s\n&quot;,$1,$2; }
	next }        /^[a-z_-]+[ \t0-9a-f]+$/ { next } 	{ print }'
physmem/D
minfree/D
desfree/D
lotsfree/D
fastscan/D
slowscan/D
maxpgio/D
tune_t_gpgslo/D
tune_t_fsflushr/D
autoup/D
ncsize/D
ufs_ninode/D
maxusers/D
max_nprocs/D
maxuprc/D
ndquot/D
nbuf/D
bufhwm/D
rlim_fd_cur/D
rlim_fd_max/D
nrnode/D
coredefault/D
EFF

echo &quot;# To change, use: adb -kw /dev/ksyms /dev/mem&quot;
echo &quot;# eg: ncsize/W 0t8000&quot;

 

[Annihilannic]

As far as I know (and as I responded in the General Unix form) changing them in /etc/system and rebooting is the only real option. Annihilannic.