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phetsims / concentration

"Concentration" is an educational simulation in HTML5, by PhET Interactive Simulations.
http://phet.colorado.edu/en/simulation/concentration
GNU General Public License v3.0
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shaker particle freezes above solution surface #20

Closed pixelzoom closed 10 years ago

pixelzoom commented 10 years ago

Originally reported as part of https://github.com/phetsims/concentration/issues/8, moved to this new issue.

@ycarpenterphet reported:

Mac OS X 10.8.4 Safari 6.0.5.

Performance lag is most evident when, occasionally, the last particle being added to the beaker will freeze just above the surface of the liquid in the beaker, with maybe an addition 1-2s lag before it dissolves/disappears.

Name: Concentration URL: http://www.colorado.edu/physics/phet/dev/html/concentration/1.0.0-rc.2/concentration_en.html Version: 1.0.0-rc.2 Features missing: flexbox, touch User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_5) AppleWebKit/536.30.1 (KHTML, like Gecko) Version/6.0.5 Safari/536.30.1 Language: en-us Window: 949x662 Pixel Ratio: 2/2

pixelzoom commented 10 years ago

@ycarpenterphet: I can't reproduce the issue you described on Mac OS 10.8.5 + Safari 6.0.5. I'm particularly interested in the "1-2 second lag" you described. Are there any additional details that you can provide? What solute were you using? Did you shake the shaker until it was empty, or did the lag occur when you stopped shaking? Was there precipitate in the bottom of the beaker? Can you provide a screenshot of the sim's state at the time the lag was observed?

pixelzoom commented 10 years ago

@ycarpenterphet: You reported that this issue was on Mac OS 10.8.4, but the debug information that you submitted indicated Mac OS 10.8.5. Which is correct?

ycarpenterphet commented 10 years ago

Sorry, the debug info is correct - it is Mac OSX 10.8.5. I had forgotten that OSX had recently updated when I submitted the issue.

I was able to reproduce the issue midday yesterday (using Drink Mix, 0.5L beaker volume, unsaturated; shook for a lengthy interval [> 10 shakes back and forth] and then stopped shaking and waited for all the particles to hit the solution surface, and the last particle froze for ~1s before dissolving). Unable to get a screenshot as it did dissolve after a short pause. Nothing was logged in the Safari developer console log.

HOWEVER, I have tried again this morning, and am no longer able to reproduce the issue.

pixelzoom commented 10 years ago

I don't need a screenshot showing it dissolving. A screenshot after it has dissolved will be fine. The screenshot will show me what state the sim is in (settings,...) when this happens.

ycarpenterphet commented 10 years ago

Noted, but I can no longer reproduce the issue.

pixelzoom commented 10 years ago

Issue can no longer be reproduced. Closing.