Re: Scimark and the sparse matrix mul test
- From: Daniel Kolesa <quaker66@xxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Tue, 18 Mar 2014 17:59:57 +0000
That'd explain it... thanks!
2014-03-18 17:41 GMT+00:00 Mike Pall <mike-1403@xxxxxxxxxx>:
> Daniel Kolesa wrote:
> > As you can see the code is direct rewrite of the Lua inner loop.
> > The performance is however vastly different - getting 1800 MFLOPS
> > rather than 400 something (just like native SciMark).
>
> The code generated for the innermost loop is more or less optimal.
> But for the chosen parameters, it only runs for 5 iterations. Then
> the overhead of the trace that runs around it and forms the outer
> loop dominates. This trace is not very efficient, since it has to
> check lots of assertions, which cannot be hoisted. This is difficult
> to improve, since the trace compiler only has local knowledge and
> can't infer much about that trace.
>
> --Mike
>
>
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