shared memory -- benchmarks, measurements

[Ed Vielmetti]

I'm looking for some guidance on measuring the performance of a system
which seems to have a lot of contention for a piece of (system V
style) shared memory.

First help would be any sort of shared memory benchmarks that anyone
has so that I could get reasonable quantifiable numbers on shared
memory performance (i.e. something to convince me that operations on a
Decstation 5000 are nn% faster than on a Dec 3100).  A look through
Eugene Miya's benchmarking list didn't yield anything obvious, but if
some piece of a bigger benchmark suite has some tools that would help
quite a bit.

Are there tools better than ipcs(1) for examining the usage of shared
memory?  Nothing obvious shows up along the lines of vmstat, netstat,
iostat et al.  

Thanks as usual for any help.

-- 
Edward Vielmetti
emv at ox.com