Comments on: Pause for the better https://undocumentedmatlab.com/articles/pause-for-the-better?utm_source=rss&utm_medium=rss&utm_campaign=pause-for-the-better Professional Matlab consulting, development and training Thu, 09 May 2019 08:25:29 +0000 hourly 1 https://wordpress.org/?v=6.7.3 By: Dima https://undocumentedmatlab.com/articles/pause-for-the-better#comment-477279 Thu, 09 May 2019 08:25:29 +0000 http://undocumentedmatlab.com/?p=3093#comment-477279 Hey Yair,
As you said, in the new MATLAB versions the pause performs the same or even better for some pause duration. The interesting thing is that for time duration in between >1ms and <10ms Java's sleep performs better (see a table below) but for duration less than equal to 1ms MATLAB the opposite is true.
Do you have any idea why is this?
Also does it make any sense at all to measure pausing time for duration less than 1ms? (Can tic/toc give reliable values for this small time period?)
============================================================
Pausing Time = 10ms :
pause() : Median = 5.6129 Mean = 5.3252 Max = 12.1966
sleep() : Median = 5.6125 Mean = 5.4652 Max = 14.849
============================================================
Pausing Time = 7ms :
pause() : Median = 8.6154 Mean = 7.7185 Max = 14.0192
sleep() : Median = 0.3767 Mean = 0.60192 Max = 1.3815
============================================================
Pausing Time = 5ms :
pause() : Median = 10.6026 Mean = 8.8543 Max = 15.4677
sleep() : Median = 0.38281 Mean = 0.57611 Max = 1.4071
============================================================
Pausing Time = 1ms :
pause() : Median = 0.0076145 Mean = 0.015155 Max = 0.31958
sleep() : Median = 0.34215 Mean = 0.53122 Max = 1.5084
============================================================

]]> By: Yair Altman https://undocumentedmatlab.com/articles/pause-for-the-better#comment-435790 Thu, 16 Aug 2018 11:35:28 +0000 http://undocumentedmatlab.com/?p=3093#comment-435790 In reply to Sometalk.

In recent Matlab releases, Matlab’s pause is no less (sometimes even more) accurate than Java’s Thread.sleep, with a consistent mean inaccuracy (overhead) of 0.1-0.2 ms and max inaccuracy of ~1ms, regardless of the pause duration. These values depend of course on the specific OS and CPU, so YMMV.

]]> By: Sometalk https://undocumentedmatlab.com/articles/pause-for-the-better#comment-435782 Thu, 16 Aug 2018 09:53:03 +0000 http://undocumentedmatlab.com/?p=3093#comment-435782 Have you rerun this benchmark more recently? I wonder if there have been any improvements in this space.

]]> By: Take a break, have a pause() | matlabideas https://undocumentedmatlab.com/articles/pause-for-the-better#comment-203570 Sat, 18 May 2013 14:54:49 +0000 http://undocumentedmatlab.com/?p=3093#comment-203570 […] time ago my colleague showed me an article from Undocumented MATLAB that argues in favour of the Java Thread.sleep() function instead of the MATLAB pause() […]

]]> By: Solving a Matlab hang problem | Undocumented Matlab https://undocumentedmatlab.com/articles/pause-for-the-better#comment-153167 Wed, 06 Feb 2013 18:01:38 +0000 http://undocumentedmatlab.com/?p=3093#comment-153167 […] a reader’s comment yesterday happened on the same page where I explained the problem and solution […]

]]> By: Marc https://undocumentedmatlab.com/articles/pause-for-the-better#comment-152359 Tue, 05 Feb 2013 11:38:40 +0000 http://undocumentedmatlab.com/?p=3093#comment-152359 In reply to Marc.

As far as I can see, pause() calls (a part of) drawnow to flush the queue. Interesting: with Process Explorer I found that pause() leaks semaphore handles as well as memory, so the flush probably forgets to clean up a semaphore object…

]]> By: Yair Altman https://undocumentedmatlab.com/articles/pause-for-the-better#comment-152351 Tue, 05 Feb 2013 11:09:32 +0000 http://undocumentedmatlab.com/?p=3093#comment-152351 In reply to Marc.

@Marc – thanks for sharing. According to the patch description, it is not directly related to pause, but perhaps the issues are somehow related.

]]> By: Marc https://undocumentedmatlab.com/articles/pause-for-the-better#comment-152329 Tue, 05 Feb 2013 10:48:48 +0000 http://undocumentedmatlab.com/?p=3093#comment-152329 The following patch worked for me to correct this memory (and windows handle!) leak on 2012b:
http://www.mathworks.com/support/bugreports/819115

Since the problem seems to be inside drawnow, using sleep+drawnow probably doesn’t help.

]]> By: Doug https://undocumentedmatlab.com/articles/pause-for-the-better#comment-149760 Wed, 30 Jan 2013 20:18:15 +0000 http://undocumentedmatlab.com/?p=3093#comment-149760 In reply to Ang.

Thanks for the `drawnow;` recommendation! It made this all work perfectly for me.

]]> By: kits https://undocumentedmatlab.com/articles/pause-for-the-better#comment-118296 Fri, 02 Nov 2012 18:55:52 +0000 http://undocumentedmatlab.com/?p=3093#comment-118296 In reply to Ang.

Try adding a “drawnow;” in that loop?

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