Dragging and IO could easily be different things. For IO, when I run
this program with a git build from 9 days ago, I don't see any
freezing (up to 1,000 lines). Do you?
(let loop ([n 0])
(printf "~a ~a\n"
(make-string 100 (integer->char (+ 97 (modulo n 26)))))
(loop (+ n 1)))
On Thu, Nov 16, 2017 at 5:55 PM, 'John Clements' via Racket Users
> Since the release of 6.11, it appears there’s been a major major performance
> regression in the display of 3d plots in the interactions window.
> To see this, try running this program (from the plot docs), then try to drag
> the image around.
> On a fresh download of the snapshot, dragging is unusable; you can click and
> drag, but all you’ll see is frantic GC. Sometimes, after releasing the
> handle, the display updates. This problem does not appear to be present in
> the released version of 6.11.
> Also, FWIW, this is running OS X High Sierra, just upgraded about a week ago.
> Also possibly related; I’ve been having serious trouble running programs that
> display long (200-300 lines) blocks of text in the interactions window. I’ll
> see (say) twelve and a half lines of purple output, then wait for three
> seconds, then another few lines of output, wait a few seconds, etc. etc.
> I’d be happy to submit this as a github issue…would it go into the
> racket/drracket repo, or the racket/racket repo?
> #lang racket
> (require plot)
> (require (only-in plot/utils bounds->intervals linear-seq))
> (define (norm2 x y) (exp (* -1/2 (+ (sqr (- x 5)) (sqr y)))))
> (define x-ivls (bounds->intervals (linear-seq 2 8 16)))
> (define y-ivls (bounds->intervals (linear-seq -5 5 16)))
> (define x-mids (linear-seq 2 8 15 #:start? #f #:end? #f))
> (define y-mids (linear-seq -5 5 15 #:start? #f #:end? #f))
> (plot3d (rectangles3d (append*
> (for/list ([y-ivl (in-list y-ivls)]
> [y (in-list y-mids)])
> (for/list ([x-ivl (in-list x-ivls)]
> [x (in-list x-mids)])
> (define z (norm2 x y))
> (vector x-ivl y-ivl (ivl 0 z)))))
> #:alpha 3/4
> #:label "Appx. 2D Normal”))
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