Re: [Gems-users] questions about opal's branch prediction and ruby's fast path hit

[yilmazer@xxxxxxxxxxx]

Thank you very much Luke. 
Quoting Luke Yen <lyen@xxxxxxxxxxx>:

> Ayse:
> 
>   1) There is no flag for perfect branch prediction.  However there is a
> feature in Opal that I have never used, and that is reading/writing branch
> traces.  I haven't looked into that code too closely but you might be able
> to collect a branch trace for your workload and feed it back into Opal to
> simulate perfect branch prediction.
> 
>   2) I don't believe setting fastpath hits to be > 1 cycle should affect
> Ruby, and I think it should be independent of protocol.
> 
>   Luke
> 
> On Tue, 28 Jun 2005 yilmazer@xxxxxxxxxxx wrote:
> 
> > Hello,
> > I have two questions.
> > First one, Is there any perfect branch prediction in Opal?
> > And, second, If I change L1 hit latency to 2 cycle, does ruby still work
> with
> > fast path hit (for MOESI SMP directory protocol and MOSI SMP broadcast
> > protocol) or not? If it doesn't, what happens?
> > Thanks for your help,
> > Ayse Yilmazer.
> >
> >
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