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Re: [cross-project-issues-dev] Observation: Frequent UI freezes when working with files

I could do an analysis based on the thread dumps submitted by the freeze detector to find frames that frequently participate in the main thread - if this is what you are asking for. However, please note that I donât have access to profiling data with the current means which would be more accurate (but having committers to share such data would warrant a discussion of its own).

Iâm out of office this and next week but may do some analysis the weeks thereafter.

Best,
Marcel



On 11 Dec 2014, at 21:41, Gunnar Wagenknecht <gunnar@xxxxxxxxxxxxxxx> wrote:

Marcel,

This seems to be very low level detail. Do you know or can you see if this relates to some higher level operation being performed from within in the UI thread which shouldn't?

-Gunnar

Am 10.12.2014 um 14:53 schrieb Marcel Bruch <marcel.bruch@xxxxxxxxxxxxxx>:

Hi,

I just want to share an insight I got from reviewing several ui freezes. One common cause for UI freezes are operations that touch the filesystem. For instance, File.isFile, File.lastModified, or WinNTFileSystem.getBooleanAttributes seem to be very expensive. From what I read on the internet it seems that some of these methods (e.g. getAttributes) may even take up to several seconds to return on windows systems.


This has been discussed elsewhere in the internet [1] and seems to be a long-standing issue in Java.



With this mail Iâd like to make you aware of this (in case you did not know this before) and would like to encourage you to actually not execute file operations in the ui thread. We may also consider doing some kind of caching but such a discussion would by far be over my knowledge, and thus, should be left to discuss with the platform team.

For now, I think we would benefit very much if every project that accesses files/resources would review their code and think about refactoring some part of the FileSystem work (even if itâs only checking a fileâs attributes) into background processes.

Best,
Marcel


[1] http://stackoverflow.com/questions/20546676/webstart-winntfilesystem-getbooleanattributes-performance


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Codetrails GmbH
The knowledge transfer company

Robert-Bosch-Str. 7, 64293 Darmstadt
Phone: +49-6151-276-7092
Mobile: +49-179-131-7721
http://www.codetrails.com/

Managing Director: Dr. Marcel Bruch
Handelsregister: Darmstadt HRB 91940