[racket] typed racket slow?

Oddly

ray at rpr:~$ time racket r.rkt

real    0m0.052s
user    0m0.040s
sys    0m0.012s

ray at rpr:~$ time racket tr.rkt

real    0m0.958s
user    0m0.876s
sys    0m0.080s



On Wed, May 8, 2013 at 10:35 AM, Sam Tobin-Hochstadt <samth at ccs.neu.edu>wrote:

> On Wed, May 8, 2013 at 6:19 AM, Carl Eastlund <cce at ccs.neu.edu> wrote:
> >
> > I see just under 5 seconds for test.rkt and just over 5 seconds for
> > utest.rkt.  So there's a fraction of a second extra startup time for
> Typed
> > Racket, but it takes less time for each subsequent computation, so the
> > difference depends on how much "real" work you do after startup.  I don't
> > know what causes that startup cost, but hopefully this kind of benchmark
> > will be useful to the Typed Racket maintainers in closing the gap for
> future
> > versions.  So, thanks for the example, Manfred!
>
> This is all true, and you can see it in simpler examples.  The empty
> modules:
>
> #lang typed/racket/base
>
> and
>
> #lang racket/base
>
> have the following timings:
>
> [samth at hermes:~/tmp plt] time racket test.rkt
>
> real    0m0.592s
> user    0m0.516s
> sys    0m0.064s
> [samth at hermes:~/tmp plt] time racket test2.rkt
>
> real    0m0.065s
> user    0m0.040s
> sys    0m0.024s
>
> So you can see about 500 ms of extra overhead. Most of this time is in
> loading and executing the runtime dependencies of Typed Racket, which
> aren't used here, but which the implementation architecture of Typed
> Racket makes it basically impossible to reduce.  We've worked hard to
> reduce this cost, but it's hard to go much further.
>
> Sam
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