I apologize for coming in late, but I've got a nice new server sitting around with modern Nehalem CPU's and scores of GB of RAM, and a limited time window to benchmark Hyperthreading against non-hyperthreading, and I'd like to ask if anyone has a highly (up to 64+ thread) parallel test script available.

If there are some good samples available which can exploit dozens of cores/threads, I'll be happy to run them both with and (hopefully) without hyperthreading, to get some actual numbers on the difference.