AIX

How do you turn SMT(symm multi threading).I think that is what it's called.

TIA
Mike

You can use "smctl" command to enable SMT..

smtctl -m off - to disable SMT
smtctl -m on - to enable SMT

Bala

I suppose you mean "Symmetrical Multiprocessing" (SMP). Multithreading is automatically enabled if you use the correct libraries for your softwre development (libpthreads.so).

The multiprocessor kernel resides in a package called "bos.mp", whereas the uniprocessor kernel resides in "bos.up". One can have installed both and decide which one to use.

First check what is installed on the machine. The command and its output should look similar to the following:

Code:

# lslpp -l bos.mp
  Fileset                      Level  State      Description         
  ----------------------------------------------------------------------------
Path: /usr/lib/objrepos
  bos.mp                    5.2.0.76  COMMITTED  Base Operating System
                                                 Multiprocessor Runtime

Path: /etc/objrepos
  bos.mp                     5.2.0.0  COMMITTED  Base Operating System
                                                 Multiprocessor Runtime

Then check which kernel gets booted on system startup. The kernel to get booted is "/unix", which is a link to the kernel file:

Code:

# ls -l /unix
lrwxrwxrwx   1 root     system           21 Oct 11 06:07 /unix -> /usr/lib/boot/unix_64

You can use the bosboot-command (as root) to alter the kernel to boot, the boot image, the device from which to boot, etc.

PLEASE READ CAREFULLY the manpage of bosboot prior to usage - you can easily render your machine useless and ready for a reinstallation by (mis-)using this command.

bakunin