SUMMARY: SHMMAX permanent system change in Solaris 10

Thanks to Jeffrey, Angelo, Kristopher, francisco, kalyan, Ian, Peter,
other
Peter, Thomas and also David Powell from Solaris Kernel
Development.

Peter
A. van Gemert said:
"The shared memory settings are now set on projects. You
have to create
a project and set the shared memory settings on this project.
Then start
your application in the project."

Dave Powell, Solaris Kernel
Development said:
"  You can still set the above limit in /etc/system; we
realized many
people have scripts or practices built around using it as an
interface
and when making the changes in Solaris 10 you refer to were careful
to
support customization of /etc/system in a compatible fashion. "
"  Once
the pressure is off, I recommend investigating the resource
controls facility
in Solaris, which allows you to set such limits on a
per-project (and
sometimes per-process) basis."


The real solution now:

Jeffrey Donovan
said:

"As root:

Get current settings to compare after changes:
oracle
-c 'sh -c "prctl -i process $$"'  > /tmp/current_settings

projmod -s -K
"project.max-shm-memory=(privileged,4GB,deny)"
'user.oracle'
su oracle -c
'sh -c "prctl -i process $$"' << to check
projadd -c "Oracle" 'user.oracle'
projmod -s -K "project.max-shm-memory=(privileged,4GB,deny)"
'user.oracle'
Get new settings:
su oracle -c 'sh -c "prctl -i process $$"' >
/tmp/new_settings

If you do a diff on the two files, you should see shared
max mem is
4gb."


Thomas Carter said:

"The file "/etc/project" defines
the settings:
user.oracle:100::::project.max-shm-memory=(privileged,17179869184,deny);
project.max-sem-ids=(privileged,600,deny);project.max-shm-ids=(privilege
d,600,deny)

The user.<username> entry defines the default project for that
specific 
user. This sets what used to be called shmmax to ~17GB as well as
the 
maximum number of semaphores to 600 and the maximum number of shared
memory segments to 600."



Peter Blackburn said:

"If you want to set
it up for a specific user:

 	shmem="4095MB"

 	projadd user.${user}
projmod -sK "project.max-shm-memory=(priv,${shmem},deny)"
user.${user}

OR
you can just make it the default:

 	projmod -sK
"project.max-shm-memory=(priv,${shmem},deny)"
default



Thank you very
much for all your answers.

David Coronel


-----Original Message-----
From: sunmanagers-bounces@sunmanagers.org
[mailto:sunmanagers-bounces@sunmanagers.org] On Behalf Of Coronel, David
Sent: Tuesday, July 11, 2006 2:17 PM
To: Sun Manager
Subject: SHMMAX
permanent system change in Solaris 10


Okay I'm stuck on this one and have
rarely felt so much pressure.

Before
Solaris 10, if I wanted to set the
shmmax parameter I would simply do:

set
shmsys:shminfo_shmmax=4294967295
Now it seems you cannot do this anymore
with Solaris 10 and that you can
do
it dynamically and for each zone.
We're not using any zones on our Solaris 10
box and I need to make a
permanent system change (or at least a quick fix for
the time being).

I
know a little about the command prctl $$ to get the
system parameters
but where do I go from there?

Any help would be greatly
appreciated.

Thank
you,
David
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