[daip] Installing AIPS on Mac Intel laptop

[Eric Greisen]

Nazirah JETHA writes:
 > I've just done this,  and this time the XAS* files did arrive with an  
 > execute permission.
 > 
 > XASERVERS: Start XAS on localhost, DISPLAY :0
 > XAS: ** TrueColor FOUND!!!
 > XAS: ***  Using shared memory option for speed ***
 > XAS: Using screen width height 3350 1100, max grey level 255
 > Shared memory id failure: Invalid argument

Great progress!  This is now easy.  From our aips manager FAQ page:

If you see this on a Mac, congratulations; you have one of the larger
display screens. The default Mac system limits shared memory pages to
4 Mbytes. When XAS starts it tells you that it is making a screen x
pixels by y pixels. The memory you will need is at least  4 x y
bytes. For the new large screens this is more than 8 Mbytes. On 10.3
and 10.4 systems, you can change this limit by changing (as root or
admin) the rc file in /etc, adjusting the kern.sysv.shm* line to

         #Setting the shared memory to something a bit more reasonable.
            sysctl -w kern.sysv.shmmax=10485760
            sysctl -w kern.sysv.shmmin=1
            sysctl -w kern.sysv.shmmni=32
            sysctl -w kern.sysv.shmseg=8
            sysctl -w kern.sysv.shmall=4096
         

If you are really lucky and have a 30-inch screen (2550 by 1500
pixels) then you will have to make the shmmax line even larger

            sysctl -w kern.sysv.shmmax=16777216

-

Note that you have 3350 by 1150 so the above 16 Mby number should
work.  If not try 20 Mby  (20971520) and be sure to change the shmall
to 4096.

Eric Greisen