Forum OpenACS Development: NetV, GAMMA, MPI, etc.
I'm curious whether AOL has ever had their NV (NetV) became a performance bottleneck. Even using TCP/IP, it is probably faster than querying an RDBMS, although lots slower than using a local NSV in shared memory. Since they are probably using it in a query-like rather than nsv-in-an-inner-loop like fashion, my guess is it's probably fast enough.
On the other hand, if you were really hitting NetV with lots of small requests, the TCP/IP latency might bite you. In that case, GAMMA might be the answer. It supports very low latency reliable MPI over cheap Intel PRO/1000 Gigabit Ethernet cards.
That seems like one of those atypical edge cases where "enterprise" style server computing and high performance cluster computing overlap. However, offhand I can't think of any web-oriented application at all that is likely to be that latency sensitive. I'm curious whether anyone has seen one.