Hi Eliot,


> Do you see such distortion on other garbage collections?


I could not yet reproduce this during GC.


> Can you please check in the VM Stats how long the compaction phase of the snapshot GC takes?


You mean this:


GCs 1,151 (408 ms between GCs 196.6 ms runtime between GCs)
full 7 totalling 2,729 ms (1.21% runtime), avg 389.9 ms
marking 1,574 ms (57.7%) avg 224.9 ms,
compacting 1,155 ms (42.3%) avg 165 ms

The issue is sporadic. Today, I did not yet perceive it again. I can check this again directly after the next accident.


Best,

Christoph

<http://www.hpi.de/>
________________________________
Von: Squeak-dev <squeak-dev-bounces at lists.squeakfoundation.org> im Auftrag von Eliot Miranda <eliot.miranda at gmail.com>
Gesendet: Mittwoch, 19. Februar 2020 04:06:36
An: The general-purpose Squeak developers list
Cc: Open Smalltalk Virtual Machine Development Discussion
Betreff: Re: [squeak-dev] VM rendering on Windows looks weird after saving the image



On Tue, Feb 18, 2020 at 12:27 AM Thiede, Christoph <Christoph.Thiede at student.hpi.uni-potsdam.de<mailto:Christoph.Thiede at student.hpi.uni-potsdam.de>> wrote:

Hi all,


some of my images take a very long time to save, despite SSD, often more than 10 seconds. Image file is 700M and changes file 90M. During saving the image, the VM does not react so Windows is diagnosing Squeak might have hung up. It would be nice to show some kind of (VM-side?) progress bar instead ...


However, the actual problem is how my host window looks after the saving is complete and the VM comes alive again:


[cid:1705b65d438f456b1e51]



I can see this quite often after saving large image files. This state remains for around one second, then I can proceed using the image as usual.

The image is garbage collected and compacted on snapshot, so the display may indeed move. However, post garbage collect the location of the display is updated, as after a normal full garbage collection.  Do you see such distortion on other garbage collections?  Can you please check in the VM Stats how long the compaction phase of the snapshot GC takes?  If that is as long as you see the distortion then the solution would be to defer display updates around at least the compaction phase.

Best,

Christoph

_,,,^..^,,,_
best, Eliot
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