Resurrecting this old thread. This issue should now be resolved with this commit: https://github.com/racket/gui/commit/20e589c091998b0121505e25c7ff2f95e8116dcb
No need to use PLT_DISPLAY_BACKING_SCALE with this fix. Evan On Thursday, May 28, 2020 at 4:18:44 AM UTC-10 evdubs wrote: > I suppose that may be helpful, but this performance issue extends to any > other Racket GUI application on Linux, including the simple editor example > from earlier in this thread. Maybe printing something to a console could > help, but it would be better if there was some fix to improve fractional > scaling performance :) > > Evan > > On Thursday, May 28, 2020 at 2:37:49 AM UTC-10, Jens Axel Søgaard wrote: > >> Slack users confirm the problem when the backing scale is 1.5. >> >> Should DrRacket give a warning dialog on Linux, when started with a >> non-integer backing scale? >> >> /Jens Axel >> >> >> Den ons. 13. maj 2020 kl. 05.48 skrev evdubs <evd...@gmail.com>: >> > I did some more digging and found locations in racket/draw that control >>> antialiasing. I tried changing them around, and saw no impact on >>> performance. >>> >>> However, I eventually stumbled upon the environment variable >>> PLT_DISPLAY_BACKING_SCALE. By using an integer value for this variable, >>> performance is nice and smooth (I tried 1 and 2; trying 1.25 and 1.5 hurt >>> performance). In Ubuntu, I do not have my display set to a fractional >>> scaling value, but I do have "Large Text" enabled. I am unsure if this >>> setting interferes with whatever PLT_DISPLAY_BACKING_SCALE defaults to. >>> >>> If you're having typing lag issues on Linux within Dr Racket or other >>> Racket GUI applications, you may want to try PLT_DISPLAY_BACKING_SCALE=1 to >>> see if that affects performance. >>> >>> Evan >>> >>> On Monday, May 11, 2020 at 2:05:06 PM UTC-10, evdubs wrote: >>>> >>>> I think what I have seen previously with setting the canvas style to >>>> 'transparent ultimately is turning off antialiasing in Cairo. >>>> >>>> Using the sample text editor from this thread, I ran the following: >>>> >>>> $ cairo-trace racket text-editor.rkt >>>> $ cairo-trace racket text-editor-transparent.rkt >>>> >>>> In the non-transparent version, we see these two lines: >>>> >>>> 16 0 0 16 0 0 matrix 2 0 0 2 0 0 matrix << /antialias >>>> //ANTIALIAS_SUBPIXEL /subpixel-order //SUBPIXEL_ORDER_RGB /hint-style >>>> //HINT_STYLE_SLIGHT /hint-metrics //HINT_METRICS_ON >> scaled-font /sf0 >>>> exch def >>>> f0 32 0 0 32 0 0 matrix 2 0 0 2 0 0 matrix << /antialias >>>> //ANTIALIAS_SUBPIXEL /subpixel-order //SUBPIXEL_ORDER_RGB /hint-style >>>> //HINT_STYLE_SLIGHT /hint-metrics //HINT_METRICS_ON >> scaled-font /sf1 >>>> exch def >>>> >>>> These lines look like this in the transparent version: >>>> >>>> 16 0 0 16 0 0 matrix 2 0 0 2 0 0 matrix << /hint-metrics >>>> //HINT_METRICS_ON >> scaled-font /sf0 exch def >>>> f0 32 0 0 32 0 0 matrix 2 0 0 2 0 0 matrix << /hint-metrics >>>> //HINT_METRICS_ON >> scaled-font /sf1 exch def >>>> >>>> I am not really sure how this initialization is happening. Can someone >>>> help me poke through the code to see how I might disable antialiasing? >>>> Should I try to make changes to gui-lib/mred/private/wx/gtk/gcwin.rkt? >>>> >>>> Evan >>>> >>>> On Friday, March 29, 2019 at 12:29:11 AM UTC-10, Bryan Lee wrote: >>>>> >>>>> I’m facing the same issues, and I came across an interesting >>>>> observation. >>>>> >>>>> It seems that DrRacket mimics scrolling behaviour by literally >>>>> replacing each line of code with the line above or below, and uses a >>>>> really >>>>> inefficient method of tracking which lines should go where, thereby >>>>> limiting how fast you can “scroll”. >>>>> >>>>> I realised that resizing the window horizontally does nothing to >>>>> improve performance, but shrinking the window height significantly >>>>> improved >>>>> performance, even if the canvas area is adjusted to remain the same. >>>>> >>>>> In addition to some function definitions in unit.rkt describing the >>>>> transposing of lines, that leads me to my conclusion. >>>>> >>>>> Thoughts? >>>>> >>>>> >>>>> >>>>> On Friday, 2 November 2018 10:46:29 UTC+8, evdubs wrote: >>>>> > Resurrecting an old thread. >>>>> > >>>>> > >>>>> > I recently tried to see what would happen if I changed the >>>>> interactions-canvas% and definitions-canvas% to be the following: >>>>> > >>>>> > >>>>> > (define interactions-canvas% >>>>> > (class editor-canvas% >>>>> > (init [style '(transparent)]) >>>>> > (super-new (style (cons 'auto-hscroll style))) >>>>> > (inherit set-scroll-via-copy) >>>>> > (set-scroll-via-copy #t))) >>>>> > >>>>> > >>>>> > >>>>> > (define definitions-canvas% >>>>> > (class editor-canvas% >>>>> > (init [style '(transparent)]) >>>>> > (super-new (style (cons 'auto-hscroll style))) >>>>> > (inherit set-scroll-via-copy) >>>>> > (set-scroll-via-copy #t))) >>>>> > >>>>> > >>>>> > This seemed to work well for entering text into a blank file, but >>>>> opening another file still showed the same lag. I was able to remove this >>>>> last bit of lag by unchecking Edit / Preferences / Editing / General >>>>> Editing / Color syntax interactively. I can now enter text into Dr Racket >>>>> as smoothly as I can in most other text editors and even the example >>>>> 'transparent editor-canvas% text editor. Background expansion can even be >>>>> enabled without incurring a per-character-entered performance hit. >>>>> > >>>>> > >>>>> > >>>>> > I do not know why setting 'transparent helps the performance of >>>>> editor-canvas%. Likewise, I do not know why interactive syntax coloring >>>>> also incurs a noticeable performance hit. As a reminder, this is mostly a >>>>> problem for large resolution displays. Shrinking the DrRacket window will >>>>> improve performance at the cost of not being able to see as much of the >>>>> text. >>>>> > >>>>> > >>>>> > >>>>> > If anyone has advice for why this might be so, or how to better >>>>> profile this code to determine what can be improved, please share. I do >>>>> not >>>>> think my current modifications merit a PR to the DrRacket repository. >>>>> > >>>>> > >>>>> > Evan >>>>> > >>>>> > >>>>> > On Wednesday, February 21, 2018 at 10:50:58 PM UTC-10, evdubs wrote: >>>>> > My apologies for the continued spam, but it feels like I am close to >>>>> having buttery-smooth text editing in DrRacket on large resolution >>>>> windows. >>>>> I just need some help :) >>>>> > >>>>> > When I set the interactions-canvas% and definitions-canvas% in >>>>> unit.rkt to have the 'transparent style (after hacking the background >>>>> handling to not throw an exception when 'transparent is set while >>>>> backgrounds are being set), I can get smooth text entry in DrRacket until >>>>> it starts getting really buggy due to my hack (like when inserting an >>>>> end-parenthesis or when resizing the window). So, it seems like what is >>>>> desired here is something like 'transparent in editor-canvas% that isn't >>>>> forcing flushes or refreshes while respecting the background setting. It >>>>> looks like canvas% provides 'no-autoclear, but editor-canvas% does not. I >>>>> am not sure where to start to see if implementing that in editor-canvas% >>>>> makes sense. Also, I tried to set lazy-refresh for the >>>>> interactions-canvas% >>>>> and definitions-canvas% but this does not seem to have the same >>>>> performance >>>>> impact as 'transparent. >>>>> > >>>>> > Anyway, if someone still happens to be following along with this and >>>>> has any ideas for what to do here, please let me know. >>>>> > >>>>> > Evan >>>>> > >>>>> > On Wednesday, February 21, 2018 at 10:42:22 AM UTC-10, evdubs wrote: >>>>> > I played around with is a bit more and noticed that setting >>>>> editor-canvas%'s style to (list 'transparent) greatly increases the >>>>> performance of the simple editor to where it performs just like any other >>>>> text editor. However, I tried applying this to DrRacket in >>>>> drracket/drracket/private/app.rkt and this did not seem to make much of a >>>>> difference. Anyway, I think the key to improving performance here is >>>>> still >>>>> the removal of the call to gdk_window_process_all_updates. The "improved" >>>>> editor looks like: >>>>> > >>>>> > >>>>> > >>>>> > #lang racket >>>>> > >>>>> > (require racket/gui) >>>>> > (define frame (new frame% [label "Simple Edit"] >>>>> > [width 1800] >>>>> > [height 1800])) >>>>> > (define canvas (new editor-canvas% [parent frame] >>>>> > [style (list 'transparent)])) >>>>> > (define text (new text%)) >>>>> > (send canvas set-editor text) >>>>> > (send frame show #t) >>>>> > >>>>> > >>>>> > >>>>> > Evan >>>>> > >>>>> > On Sunday, February 11, 2018 at 11:41:53 AM UTC-10, evdubs wrote: >>>>> > I created PR 95 to remove the call to >>>>> gdk_window_process_all_updates. I am still unsure if there are legacy or >>>>> compatibility reasons for having this call. >>>>> > >>>>> > Evan >>>>> > >>>>> > On Saturday, February 10, 2018 at 12:39:58 PM UTC-10, evdubs wrote: >>>>> > I made the following change to window.rkt's flush-display >>>>> > >>>>> > >>>>> > >>>>> > (define (flush-display) >>>>> > (try-to-sync-refresh) >>>>> > ;; (gdk_window_process_all_updates) >>>>> > (gdk_display_flush (gdk_display_get_default))) >>>>> > >>>>> > >>>>> > I made this change after finding the following note for the >>>>> gdk_window_process_all_updates documentation >>>>> > >>>>> > gdk_window_process_all_updates has been deprecated since version >>>>> 3.22 and should not be used in newly-written code. >>>>> > Things run much better now in DrRacket (and in the little editor >>>>> example), but still the performance isn't great. >>>>> > >>>>> > I would create a pull request with the removal of >>>>> gdk_window_process_all_updates but I don't know if there are other Racket >>>>> instances out there relying on older GTK versions that need this call. Is >>>>> there a way to check for that? >>>>> > >>>>> > Evan >>>>> > >>>>> > On Saturday, February 10, 2018 at 11:08:16 AM UTC-10, evdubs wrote: >>>>> > I had to add a sampler to that code so what I really had was this: >>>>> > >>>>> > >>>>> > >>>>> > #lang racket/gui >>>>> > >>>>> > (require profile) >>>>> > (require profile/analyzer) >>>>> > (require profile/render-text) >>>>> > (require profile/sampler) >>>>> > >>>>> > (define s (create-sampler (current-thread) 0.0)) >>>>> > >>>>> > (s 'get-snapshots) >>>>> > >>>>> > (define ec% >>>>> > (class editor-canvas% >>>>> > (define/override (on-paint) >>>>> > (profile (super on-paint) #:threads #t #:order 'self)) >>>>> > (define/override (on-char e) >>>>> > (profile (super on-char e) #:threads #t #:order 'self)) >>>>> > (super-new))) >>>>> > (define frame (new frame% [label "Simple Edit"] >>>>> > [width 1800] >>>>> > [height 1800])) >>>>> > >>>>> > (define canvas (new ec% [parent frame])) >>>>> > (define text (new text%)) >>>>> > (send canvas set-editor text) >>>>> > (send frame show #t) >>>>> > Then, I could use the following in the interactions window to get >>>>> results after typing in some text to the text editor. >>>>> > >>>>> > >>>>> > >>>>> > (render (analyze-samples (s 'get-snapshots))) >>>>> > Here are my results for the rows that had significant values for >>>>> "self" >>>>> > >>>>> > >>>>> > >>>>> > >>>>> ================================================================================================================ >>>>> >>>>> >>>>> > Caller >>>>> > Idx Total Self Name+src >>>>> Local% >>>>> > ms(pct) ms(pct) Callee >>>>> > >>>>> ================================================================================================================ >>>>> >>>>> >>>>> > call-with-break-parameterization >>>>> [2] 100.0% >>>>> > [5] 19000(10.6%) 6221(3.5%) dispatch-on-char method in window% >>>>> ...ow.rkt:778:4 >>>>> > ??? [45] >>>>> 29.3% >>>>> > flush-display [14] >>>>> 27.8% >>>>> > call-pre-on-char method in >>>>> window% [15] 10.2% >>>>> > >>>>> ---------------------------------------------------------------------------------------------------------------- >>>>> >>>>> >>>>> > call-with-break-parameterization >>>>> [2] 100.0% >>>>> > [7] 2580(1.4%) 2580(1.4%) ??? >>>>> ...acket/collects/ffi/unsafe/atomic.rkt:115:16 >>>>> > >>>>> ---------------------------------------------------------------------------------------------------------------- >>>>> >>>>> >>>>> > dispatch-on-event method in >>>>> window% [9] 3.1% >>>>> > dispatch-on-char method in >>>>> window% [5] 96.9% >>>>> > [14] 5442(3.0%) 5442(3.0%) flush-display >>>>> ...d/private/wx/gtk/window.rkt:891:0 >>>>> > >>>>> ---------------------------------------------------------------------------------------------------------------- >>>>> >>>>> >>>>> > ??? [13] >>>>> 100.0% >>>>> > [22] 179456(100.0%) 158080(88.1%) loop >>>>> .../drracket/drracket/private/rep.rkt:1456:17 >>>>> > ??? [3] >>>>> 11.3% >>>>> > wait-now [32] >>>>> 0.0% >>>>> > >>>>> ---------------------------------------------------------------------------------------------------------------- >>>>> >>>>> >>>>> > ??? [70] >>>>> 100.0% >>>>> > [75] 5512(3.1%) 5512(3.1%) channel-put >>>>> ...lects/racket/private/misc.rkt:169:2 >>>>> > >>>>> ---------------------------------------------------------------------------------------------------------------- >>>>> >>>>> >>>>> > The culprit, to me, looks like flush-display. Do you perhaps have >>>>> any thoughts on the flush-display usage within window.rkt? I will try to >>>>> poke at this a bit more. >>>>> > >>>>> > Evan >>>>> > >>>>> > On Saturday, February 10, 2018 at 3:35:35 AM UTC-10, Robby Findler >>>>> wrote:If you run this code, does the profiling information reveal >>>>> anything >>>>> > >>>>> > interesting? >>>>> > >>>>> > >>>>> > >>>>> > #lang racket/gui >>>>> > >>>>> > (require profile) >>>>> > >>>>> > (define ec% >>>>> > >>>>> > (class editor-canvas% >>>>> > >>>>> > (define/override (on-paint) >>>>> > >>>>> > (profile (super on-paint))) >>>>> > >>>>> > (define/override (on-char e) >>>>> > >>>>> > (profile (super on-char e))) >>>>> > >>>>> > (super-new))) >>>>> > >>>>> > (define frame (new frame% [label "Simple Edit"] >>>>> > >>>>> > [width 1800] >>>>> > >>>>> > [height 1800])) >>>>> > >>>>> > (define canvas (new ec% [parent frame])) >>>>> > >>>>> > (define text (new text%)) >>>>> > >>>>> > (send canvas set-editor text) >>>>> > >>>>> > (send frame show #t) >>>>> > >>>>> > >>>>> > >>>>> > >>>>> > >>>>> > On Fri, Feb 9, 2018 at 11:05 PM, Evan Whitmer <evd...@gmail.com> >>>>> wrote: >>>>> > >>>>> > > I forgot to mention that I have a 4K display, and I think that's >>>>> important >>>>> > >>>>> > > to note here. >>>>> > >>>>> > > >>>>> > >>>>> > > >>>>> > >>>>> > > On Friday, February 9, 2018 at 7:00:18 PM UTC-10, Evan Whitmer >>>>> wrote: >>>>> > >>>>> > >> >>>>> > >>>>> > >> I, too, am having typing latency issues in DrRacket in the >>>>> definitions >>>>> > >>>>> > >> window. As Dave noted, the size of the window seems to be related >>>>> to the >>>>> > >>>>> > >> issue, and, in my experience, it's not just an issue with the >>>>> Definitions >>>>> > >>>>> > >> window. Both the Interactions window and even the following code >>>>> snippet >>>>> > >>>>> > >> (taken from StackOverflow) will have this same lag: >>>>> > >>>>> > >> >>>>> > >>>>> > >> (define frame (new frame% [label "Simple Edit"] >>>>> > >>>>> > >> [width 1800] >>>>> > >>>>> > >> [height 1800])) >>>>> > >>>>> > >> (define canvas (new editor-canvas% [parent frame])) >>>>> > >>>>> > >> (define text (new text%)) >>>>> > >>>>> > >> (send canvas set-editor text) >>>>> > >>>>> > >> (send frame show #t) >>>>> > >>>>> > >> >>>>> > >>>>> > >> (define delta (make-object style-delta% 'change-size 14)) >>>>> > >>>>> > >> (send delta set-face "Menlo") >>>>> > >>>>> > >> (send text change-style delta) >>>>> > >>>>> > >> >>>>> > >>>>> > >> I am on Ubuntu 17.10 using Racket 6.11 with the proprietary >>>>> nVidia drivers >>>>> > >>>>> > >> and X.org. My GTK version is 3. I don't have this issue with any >>>>> of the >>>>> > >>>>> > >> other text editors that I've tried to use. >>>>> > >>>>> > >> >>>>> > >>>>> > >> I tried to profile the above text editor, but I am a novice >>>>> Racketeer and >>>>> > >>>>> > >> could not figure out a way to profile a thread managed in >>>>> racket/gui. Does >>>>> > >>>>> > >> anyone perhaps know of a way to hook the above into a profiler to >>>>> see what >>>>> > >>>>> > >> might be the cause of this lag? >>>>> > >>>>> > >> >>>>> > >>>>> > >> Has anyone happened to stumble onto this issue recently and >>>>> solved it? >>>>> > >>>>> > >> >>>>> > >>>>> > >> Evan >>>>> > >>>>> > >> >>>>> > >>>>> > >> On Saturday, April 1, 2017 at 6:07:28 AM UTC-10, gneuner2 wrote: >>>>> > >>>>> > >>> >>>>> > >>>>> > >>> On Fri, 31 Mar 2017 13:34:38 -0700 (PDT), Dave Musicant >>>>> > >>>>> > >>> <musi...@gmail.com> wrote: >>>>> > >>>>> > >>> >>>>> > >>>>> > >>> >I'm using DrRacket on a 64-bit Ubuntu 16.04 system with the >>>>> > >>>>> > >>> >default Unity windowing system, and am finding that typing >>>>> > >>>>> > >>> >in the definitions window is laggy. >>>>> > >>>>> > >>> >>>>> > >>>>> > >>> I've seen similar behavior on CentOS 6.5-6.8 under Gnome(2) - it >>>>> has >>>>> > >>>>> > >>> persisted across a number of OS and Racket versions. >>>>> > >>>>> > >>> >>>>> > >>>>> > >>> I have seen the lag in Dr Racket with 6.1, 6.5, 6.7 and 6.8. I >>>>> > >>>>> > >>> compiled 6.1 and 6.5 myself, so there might have been something >>>>> > >>>>> > >>> strange in those cases, but 6.7 and 6.8 were stock Linux x86_64 >>>>> > >>>>> > >>> downloads. >>>>> > >>>>> > >>> >>>>> > >>>>> > >>> Turning off background expansion helps somewhat, but I have >>>>> found that >>>>> > >>>>> > >>> limiting memory seems to help the most. On Linux I run Dr >>>>> Racket with >>>>> > >>>>> > >>> the limit set to 512MB. That might be too low for some people, >>>>> but it >>>>> > >>>>> > >>> works fine for my typical (webserver app) uses. >>>>> > >>>>> > >>> >>>>> > >>>>> > >>> George >>>>> > >>>>> > >>> >>>>> > >>>>> > > -- >>>>> > >>>>> > > You received this message because you are subscribed to the Google >>>>> Groups >>>>> > >>>>> > > "Racket Users" group. >>>>> > >>>>> > > To unsubscribe from this group and stop receiving emails from it, >>>>> send an >>>>> > >>>>> > > email to racket-users...@googlegroups.com. >>>>> > >>>>> > > For more options, visit https://groups.google.com/d/optout. >>>>> >>>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Racket Users" group. >>> >> To unsubscribe from this group and stop receiving emails from it, send an >>> email to racket...@googlegroups.com. >> >> >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/racket-users/c369c5b0-9c78-4636-be07-1a36c4f35bdd%40googlegroups.com >>> >>> <https://groups.google.com/d/msgid/racket-users/c369c5b0-9c78-4636-be07-1a36c4f35bdd%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >> >> >> -- >> -- >> Jens Axel Søgaard >> >> -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/de7d997e-7ec6-432a-8fe9-c6732688be9cn%40googlegroups.com.
