> Simple arithmetic:  Emulation normally takes an order of magnitude more 
> cycles.  Thus a
> workload that consumes 10% of a 2Ghz intel processor would consume 1/2 of a 
> z10 IFL.  Even

Good JIT engine emulation these days is a lot lot better than that. You
do need a lot of memory to make that work well.

You have another big problem as well - PC applications are still mostly
built and tuned on the basis that CPU is cheap, idle time doesn't matter,
memory bandwidth is poor, and memory capacity is huge.

Not exactly 390 compatible assumptions and ones emulation will magnify.

Alan

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