Shared Memory

[Joe Redman]

When I bring up the "System Tables Report" using glance I show under Shared Memory portion: Available of 1.58GB and Reqs of 2.84GB. I am not experiencing any problems but is this telling me I should be increasing my shared memory segment size (shmmax)??

Thanks, Joe

[Pete Randall]

Joe,

Using Glance's hyper-help on the available column yields this:

The maximum achievable size of the shared memory pool on the system. This is a theoretical maximum determined by multiplying the configured maximum number of shared memory entries (shmmni) by the maximum size of each shared memory segment (shmmax). Your system may not have enough virtual memory to actually reach this theoretical limit - one cannot allocate more shared memory than the available reserved space configured for virtual memory.

It sounds like there's nothing you can do to raise it.

Pete

[Pete Randall]

And the requested column is explained thusly:

The size (in KB unless otherwise specified) of the sum of the currently requested shared memory segments. This may be more than shared memory used if any segments are swapped out. It also may be less than shared memory used due to internal fragmentation of the shared memory pool.


Pete