Re: [Gems-users] Difference between Opal and Simics Driver

[Greg Byrd <gbyrd@xxxxxxxx>]

Opal is a cycle-accurate model of an out-of-order issue processor.  The 
Simics driver is a one-instruction-per-cycle processor model (i.e., 
in-order).
The Simics model is faster, but does not accurately model a modern 
processor.  Opal is much slower, more accurate.
Opal only supports the SPARC ISA.  Simics (with Ruby) can be either the 
SPARC or the x86 ISA.
...Greg


avadh patel wrote:
> hello everyone,
>
> I have recently started using gems. At currently
> I am successfully able to run ruby and opal and
> generate some results for splash bechmarks.
>
> As per my knowledge, we can run ruby with either
> opal or native simics. I want to know what are the
> major difference/limitations of ruby simulation when
> its run using simics instead of opal.
>
>
> Thanks in advance.
>
> - Avadh
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