> ... > > > it is not running Itanium software, it is > emulationg > > > the zSeries arch. > > How does this make it slower? > > Another interesting argument. If the basic > assumption is that the > emulated zArch performance is proportional to the > underlying Itanium > performance, there's a lot of things that could be > compelling here.
Having not seen the CPU its hard to say what is going on, but the PSI blurb implied that they were using changed microcode and "Just-In-Time" tecniques to speed up "emulation". > Certainly Hercules seems to do an awful lot in this > area, and the > argument for Core Duos and Opterons seems to track > Moore's Law closely. > I can't really judge. I understand the mainframe at work (and I forget the model) is rated at about 70 mips. When emulating normal "370" mode, with Hercules, running VM/370R6, I get about 28 mips out out of a hyper-threaded 3ghz Pentium. I know its slower when emulating 64 bit, but from this it seems that Emulation could easily provide that level of performace on a 4-core box. (either 2 x 2 core or 1 x dual core). ____________________________________________________________________________________ No need to miss a message. Get email on-the-go with Yahoo! Mail for Mobile. Get started. http://mobile.yahoo.com/mail
