Re: [Iverilog-devel] vec4-stack branch, and the vvp rework

[Stephen W. <st...@ic...>]

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I'm looking at performance now. I'm not too concerned about compile
time, but I want run times to at least match the performance of the
master version before I merge it in. I've got gprof profiles going,
and I've already pushed some minor improvements.

On 11/14/2014 05:02 PM, Cary R. wrote:
> For the short tests I'm guessing the initial setup and parsing is
> a significant part of the total run time and that the longer tests
> are a more accurate measure of the change in simulation speed
> caused by the vec4-stack changes. Given that Icarus is already slow
> I would hope that this rework does not get merged into master until
> it is at least on par with the current implementation. Ideally this
> rework would give us a significant speedup, but that may be
> optimistic without a more expansive rework.
> 
> I may have some time to test this branch later, but work and my
> personal life are swamping me right now.
> 
> Cary
> 
> 
> On Friday, November 14, 2014 4:38 PM, Martin Whitaker 
> <mai...@ma...> wrote:
> 
> 
> I've run all my regressions tests that Icarus can handle without 
> exposing any bugs. Run time for a large group of relatively short
> tests increased by 25%. Run time for a small group of moderately
> long tests increased by 50%.
> 
> Stephen Williams wrote:
> 
> A little while ago I took on a redesign of the handling of vectors 
> in the vvp run-time. For those of you in the know, the idea is to 
> replace the flat thread vector space with a vector stack. The
> intent is to remove some vector length constraints and to allow for
> some theoretical performance improvements.
> 
> That work is in the vec4-stack branch. Almost all of the
> regression test now works with the new branch and I want to start
> building up confidence in it by putting it out there for the more
> daring of you to try out.
> 
> The intent is that version perform better then the existing style, 
> but those performance benefits are almost surely not realized yet. 
> I will be doing some profiling soon and really tackling execution 
> times, but if you have any feedback there, that would be good,
> too.
> 
> Right now, however, I'm mostly interested in quality of the
> results. Did I introduce any new bugs? There are a very few that I
> see in the ivtest results, but I would like to hear about any new
> bugs.
> 
> Thanks,
>> 
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- -- 
Steve Williams                "The woods are lovely, dark and deep.
steve at icarus.com           But I have promises to keep,
http://www.icarus.com         and lines to code before I sleep,
http://www.picturel.com       And lines to code before I sleep."
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