large files, very slow editor, no fix?

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Scott
Scott 2011-8-12
Changes to the editor in R2011 have dramatically slowed down the editor when working with large m-files (e.g. 1000's of lines). I have been in correspondence with support staff, who tell me to disable cell mode and break up the file into smaller files.
Disabling cell mode does help somewhat, but there is still a lot of latency while typing. It can be several seconds to see what was typed. Even scrolling is choppy.
So the next step is break up the large file. But here's the problem. Most of the functions within the file are nested functions, which share the scope of the parent functions. How do I move the nested functions to separate files and maintain the behavior of nested functions?

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采纳的回答

Michael Katz
Michael Katz 2011-8-12
Try also increasing the size of the Java heap. File -> Preferences -> General -> Java Heap Memory. It may not help, depending on where the time is being spent, but it's worth a shot.
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Scott
Scott 2011-8-12
That fixed it completely! I octupled the Java heap and the editor is snappy and vivacious again.
Thank you user community!
Scott
Scott 2011-8-14
Well, maybe that isn't the only problem. At first, the editor is fast, but before long it slows way down again.

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更多回答（5 个）

Andrew Drake
Andrew Drake 2013-8-27
put "exit" on the first line
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Scott
Scott 2013-8-27
At first, I thought this was just a snarky response. But then I got to thinking it might have some impact on the MTree functionality, so I tried it.
Indeed, it effectively turned off MTree and let me edit the file without any slowdowns. Of course, it also turns off error checking and disables the "show functions" popup menu, but keeps code folding functional.
It is a lot more convenient than the "official" Matlab workaround of issuing "com.mathworks.services.Prefs.setBooleanPref('CodeParserServiceOn',false)" and restarting Matlab. At least I don't have to wait through a restart. I just have to remember to remove the "exit" before saving changes.
An alternative to "exit" on the first line would be anything that produces an error, such as a simple "x".

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Oleg Komarov
Oleg Komarov 2011-8-12
By moving the nested functions to separate files you will:
  1. Lose the ability to see the parent's function workspace
  2. Other functions will see them and you may get into conflicts
To solve 2. you can make the ex-nested functions private.
To solve 1. you have two options:
  • Add inputs to your ex-nested functions (no big news here).
  • [STRONGLY UNRECOMMENDED] Hardcode assignin calls.
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Scott
Scott 2011-8-12
I suspect the problem would persist with subfunctions, too. My guess is that the slowdown comes from the new features in the editor, such as expanded use of syntax coloring, and the highlighting of all instances of the word adjacent to the cursor throughout the entire file. I don't see a way to turn that off.
I wish there were a command that would expand the scope of a function to include the scope of another function, like ExpandScope('parent_function').
Michael Katz
Michael Katz 2011-8-12
If the latency is related to the code structure, using subfunctions would help, as the editor needs more power to process deeper into nested code. Without seeing the code, it's hard to make a good judgement, but if the nesting is several levels deep, maybe it can be rewritten to use fewer levels. Also consider using a class object if that data has to be shared within that many function calls.

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Daniel Shub
Daniel Shub 2011-8-12
You could switch to an editor like emacs/vim.
You could move your nested functions to separate files. Then write another function that writes a new mfile that integrates your nested functions into the main function.
Divide your code up into smaller and reusable blocks. Use structures to efficiently pass the formerly nested functions arguments.
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Scott
Scott 2011-8-12
OK, I'm open to the idea of a new editor. Would it integrate well into Matlab? I'm using Win7 64bit.
Would it use color to differentiate the various parts of the syntax? Would it flag syntax errors and make suggestions for correction? Does it fold sections of code? Autosave? Does it permit stepping through the code in debug mode, with the value of variables popping up when hovering over them? Will it let me jump to the offending line of code after clicking on an error message?
If so, I'm very interested in looking into this!
Daniel Shub
Daniel Shub 2011-8-12
I don't use emacs with MATLAB, but more details can be found at:
http://blogs.mathworks.com/desktop/2009/09/14/matlab-emacs-integration-is-back/
and
http://matlab-emacs.sourceforge.net/faq.shtml
for more details ...
Would it use color to differentiate the various parts of the syntax? Yes
Would it flag syntax errors and make suggestions for correction? To some degree. It integrates with mlint.
Does it fold sections of code? I believe there are emacs plugings for this.
Autosave? Yes
Does it permit stepping through the code in debug mode, with the value of variables popping up when hovering over them? I am not sure on this one, but it looks like it.
Will it let me jump to the offending line of code after clicking on an error message? Yes

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Andreas Goser
Andreas Goser 2011-8-12
I know of a couple of examples where disabling cell mode completley healed the issue. Actually, I know only of one counter-example and this was a user who had his large MATLAB Code on an external server (mapped drive). If this is the case for you, please try putting the file local.
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Scott
Scott 2011-8-12
I appreciate your giving my problem attention!

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per isakson
per isakson 2011-8-12
An object oriented design with methods in a separate @-folder should solve the problem with the editor.
Rewriting object oriented code, which is implemented with nested functions, might not be as bad as it sounds. I've done it a few times (for other reasons) with pre-R2008a m-files. At most a couple of thousand lines. However, it is certainly not a quick-fix.

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