To look at shared memory on a Linux system, you can try the ipcs command. This command is available on both Linux and Solaris systems, but your options will vary.

Several commands report on how much memory is installed and being used on Linux systems. You can be deluged with details or get a quick and easy answer, depending on the command you use.

Useful Linux commands for examining memory usage and what the numbers mean ...

An excerpt from Linux Programming by Example: The Fundamentals explaining memory management and the Linux/Unix address space.

Silicon Graphics is behind the world's largest shared-memory Linux system, a 512-processor behemoth at NASA's Ames Research Center.