On 11/14/2013 03:22 PM, stamo...@racket-lang.org wrote:
stamourv has updated `master' from 44f810aa72 to a87dcc252e.
http://git.racket-lang.org/plt/44f810aa72..a87dcc252e
=====[ 4 Commits ]======================================================
Directory summary:
20.3% pkgs/contract-profile/
39.5% pkgs/typed-racket-pkgs/typed-racket-lib/typed-racket/optimizer/
20.9%
pkgs/typed-racket-pkgs/typed-racket-test/tests/typed-racket/optimizer/missed-optimizations/
17.2%
pkgs/typed-racket-pkgs/typed-racket-test/tests/typed-racket/optimizer/tests/
~~~~~~~~~~
0dccecc Vincent St-Amour <stamo...@racket-lang.org> 2013-11-12 17:40
:
| Clarify impedance mismatch between profiler and blame info.
:
M pkgs/contract-profile/boundary-view.rkt | 15 ++++++++-------
~~~~~~~~~~
04eeeb1 Vincent St-Amour <stamo...@racket-lang.org> 2013-11-13 18:24
:
| Log hidden prng parameter dereferences.
:
M .../typed-racket-lib/typed-racket/optimizer/hidden-costs.rkt | 8 ++++++++
~~~~~~~~~~
7616e26 Vincent St-Amour <stamo...@racket-lang.org> 2013-11-14 11:04
:
| Add types and optimizations for flrandom and unsafe-flrandom.
:
A
pkgs/typed-racket-pkgs/typed-racket-test/tests/typed-racket/optimizer/tests/flrandom.rkt
M .../typed-racket/base-env/base-env-numeric.rkt | 3 +++
M .../typed-racket/optimizer/float.rkt | 19 ++++++++++++++++++-
M .../typed-racket/optimizer/hidden-costs.rkt | 4 ++++
~~~~~~~~~~
a87dcc2 Vincent St-Amour <stamo...@racket-lang.org> 2013-11-14 14:11
:
| Log non-optimized fixnum-specific ops as hidden costs.
:
M .../optimizer/missed-optimizations/fixnum.rkt | 6 +++---
M .../optimizer/tests/fixnum-bounded-expr.rkt | 8 ++++----
M .../optimizer/tests/invalid-fxquotient.rkt | 2 +-
A
pkgs/typed-racket-pkgs/typed-racket-test/tests/typed-racket/optimizer/missed-optimizations/fixnum-no-bound.rkt
M .../typed-racket/optimizer/fixnum.rkt | 18 ++++++++++++++++--
=====[ Overall Diff ]===================================================
For the following program, on my computer, the new "random ->
unsafe-flrandom" optimization slows down the first loop and speeds up
the second:
#lang typed/racket
(require math/flonum
racket/unsafe/ops)
(define g (current-pseudo-random-generator))
(define bx (make-flvector 1))
(for: ([_ (in-range 5)])
(time (for: ([_ (in-range 5000000)])
(unsafe-flvector-set! bx 0 (random)))))
(newline)
(for: ([_ (in-range 5)])
(time (for: ([_ (in-range 5000000)])
(unsafe-flvector-set! bx 0 (random g)))))
IOW, it appears the optimization only helps when passing in a
pseudo-random generator. I suspected this might be the case when I ran a
bunch of tests of the math library's sampling algorithms and some of
them were a hair slower after updating my Racket repo.
The only reason I can think of that this would be the case is if the
built-in's parameter retrieval is faster. Anyhow, changing (random) to
(unsafe-flrandom (current-pseudo-random-generator)) looks like a
pessimization for now.
(I'm going to speed up the math library's samplers by caching the
parameter value and using the new `flrandom', but of course that's a
separate issue.)
Neil ⊥
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