On Aug 10, 11:33 pm, Mark Engelberg <mark.engelb...@gmail.com> wrote:
> On Mon, Aug 10, 2009 at 11:15 PM, Andy
>
> Fingerhut<andy_finger...@alum.wustl.edu> wrote:
> > I suspect I'm doing something wrong in my mutable Java array
> > implementation, but I don't see what it could be.
>
> There still seems to be a lot of boxing and unboxing going on. For example,
> in:
> (let [[momx momy momz] (offset-momentum bodies)
> the call to offset-momentum returns a vector of the three doubles, so
> they would be boxed, so momx momy momz are not primitives.
That code is only run once during initialization, then never again.
It is well under 0.1% of the entire run time of the long benchmark.
The bulk of the computation is this call tree, where advance! is
called 50,000,000 times sequentially in the long benchmark:
advance!
bodies-update-velocities!
bodies-update-positions!
Andy
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