McIDAS-X uses shared memory for frame allocation. On some operating systems, the shared memory facility is activated by default and has a sufficient maximum segment size for most McIDAS-X sessions. However, this is not true for Solaris, Linux and Mac OS X systems. The system administrator must force the kernel to activate the shared memory system at boot time and set the maximum segment size to 512 MB or greater the first time McIDAS-X is installed on a Solaris, Linux or Mac OS X workstation.
The McIDAS Users' Group uses the following settings on Solaris, Linux, and Mac OS X.Solaris
2. Check the maximum size of a shared memory segment using the command below. The value is indicated in bytes; the example lists a 512 MB maximum shared memory segment.
|set shmsys:shminfo_shmmax = 536870912|
4. Reboot the system so the forceload entry and 512 MB maximum shared memory size take effect.
Set the shared memory size to 512 MB by adding the two lines listed below to the end of the file.
|kernel.shmmax = 536870912
kernel.shmall = 536870912
Run the following command from the Unix prompt.
Type: /sbin/sysctl -p
Mac OS X
As user 'root', create the file /etc/sysctl.conf and add the following lines:
After making these changes, the system will need to be rebooted for the changes to take effect.
Updated January 2013