[daip] aips error in TV open

[Eric Greisen]

On 07/13/2017 02:39 PM, Lu Shen wrote:
> Hi Eric,
>
> I am using TVLOD in aips. There is a error when I input tvinit.
>
>
> UNIXSERVERS: Start XAS1 on localhost, DISPLAY /private/tmp/com.apple.launchd.yv41DKTAXE/org.macosforge.xquartz:0
> XAS: ** TrueColor FOUND!!!
> XAS: ***  Using shared memory option for speed ***
> XAS: Using screen width 1910 height 958,
>      max grey level 8191 in 16 grey-scale memories
> Shared memory id failure: Cannot allocate memory


The use os shared memory is limited (by default) on Macs.  YOu can 
either choose not to use shared memory (in .Xdefaults file - see HELP 
XAS inside AIPS) or better follow the instructions from our FAQ page:

After you follow the instructions below appropriate to your release of 
the Mac operating system, you must re-boot the computer. The control 
file for shared memory is read at boot time only. Note that a re-boot is 
not simply logging the current user out and then back in. You must do a 
full restart.

  On the latest "leopard", "snow leopard", "lion", "mountain lion", and 
"yosemite" (X 10.5-10.10) systems, /etc/rc is gone and creating it will 
have no effect. You need to create an /etc/sysctl.conf file and put the 
values in it,

             kern.sysv.shmmax=10485760
             kern.sysv.shmmin=1
             kern.sysv.shmmni=32
             kern.sysv.shmseg=8
             kern.sysv.shmall=4096


You should use the values you had when you were running tiger. Those 
could be in /Previous\ System/etc/rc, assuming you have "Previous 
System". So three different OS upgrades and three different ways to 
adjust the default shared memory. Note: You will need to reboot the 
system for the change in shared memory to take place. You can check if 
the shared memory changes happened by typing "sysctl kern.sysv" in a 
terminal or xterm window. Look for the kern.sysv.shm* values. If the 
values have not changed, make sure you haven't inadvertently left in 
"sysctl -w" in the /etc/sysctl.conf file or mis-typed one of the values. 
If the /etc/sysctl.conf file is not properly formatted, or shmmax is not 
an integer multiple of shmall, the shared memory will not be adjusted 
after the reboot.

ERic Greisen