[racket-dev] Fwd: [shootout-Feature Requests][312552] Scheme PLT should be renamed to Racket

From: Robby Findler (robby at eecs.northwestern.edu)
Date: Fri Jun 18 09:38:24 EDT 2010

We're talking about this code, right?


It is already unsafe, I think?


On Fri, Jun 18, 2010 at 8:26 AM, Vincent St-Amour <stamourv at ccs.neu.edu> wrote:
> At Fri, 18 Jun 2010 08:18:14 -0400,
> Sam Tobin-Hochstadt wrote:
>> I submitted a request to the computer language shootout to rename PLT
>> to Racket.  The following message shows the difference in performance
>> between 4.2.5 and 5.0 - it's probably worth taking a look at the
>> discrepancies.
> The discepancies are on the mandelbrot benchmark. The same
> discrepancies can be observed between different runs of the benchmark
> on 5.0, even using the same compiled bytecode of the benchmark; about
> 10-20% of the time, for no apparent reason, that benchmark would take
> twice as long as usual. I observed this random behavior on 5.0, but I
> don't know if it appeared on 4.2.5 as well.
> That random behavior seems to be linked to the use of safe flonum
> operations (fl+ and co.) since changing the benchmark to use either
> generic arithmetic operations or unsafe float operations makes the
> running times of the benchmark consistent. I told Matthew about that.
> I've been working on typed versions of these benchmarks, and some are
> faster than the untyped versions (including the mandelbrot benchmark,
> whose typed version is ~30% faster and does not show the random
> behavior discussed above). I'll push them later today, and some could
> be worth using on the shootout.
> Vincent
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