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  VS Arduino › › › Disassembly View - Long pause, seems like a hang but isn't
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Hot Topic (More than 8 Replies) Disassembly View - Long pause, seems like a hang but isn't (Read 10420 times)
CapnBry
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Disassembly View - Long pause, seems like a hang but isn't
Oct 19th, 2012 at 7:25pm
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I've turned this on and once my compile finishes and it spits out the "Binary sketch size..." my VS 2010 hangs and starts sucking up one whole CPU. Checking in process explorer I see that it has spawned avr-objdump and as soon as that exits (approximately 23 seconds later) Visual Studio starts working again.

If I run the command myself, it dumps the disassembly to my file and exits immediately:
"C:\Arduino\src\build\windows\work\hardware\tools\avr\bin\avr-objdump"  -h -S  \FridgeControl.elf"  > x

I've also tried it with a standard Arduino-1.0.1 directory with the same results. Any idea where I should be looking for more information on what's happening?
« Last Edit: Oct 20th, 2012 at 7:01pm by Tim@Visual Micro »  
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Tim@Visual Micro
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Re: Disassembly View Hangs
Reply #1 - Oct 19th, 2012 at 7:41pm
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I hope you don't mind I have split this into a new thread so that the original discussion author doesn't receive lots of emails.

Thanks for the info. I'll give it another try later.

Two questions...

1) Is that a custom board def "atmega328bb"?

2) Can you please try to compile with the uno board selected to help narrow things down

Thanks
  
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CapnBry
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Re: Disassembly View Hangs
Reply #2 - Oct 19th, 2012 at 8:19pm
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Yeah no problem. Sorry about gloming onto the old thread. I've just tried it with an "Unu" target and the results are the same. I just happened to have a larger project open and this time it took a lot longer.

Blink.ino: Almost instantaneous disassembly generation.
FridgeControl.ino: 16kB, ~24 second disassembly generation.
HeaterMeter.ino: 23kB ~50 second disassembly generation.

So it might be something related to the size of the sketch. devenv.exe's memory spikes up and down a few times during the process (the first level is ~200MB, the spikes are ~500MB, final value ~360MB). 


ProcMon shows very little file or registry activity from either devenv.exe or avr-objdump.exe

EDIT: Visual Studio 2010 Professional by the way, Windows 7 Pro x64
« Last Edit: Oct 19th, 2012 at 8:30pm by CapnBry »  
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Tim@Visual Micro
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Re: Disassembly View Hangs
Reply #3 - Oct 19th, 2012 at 8:26pm
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That's great info. I'll try to nail it later today. Thanks
  
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Tim@Visual Micro
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Re: Disassembly View Hangs
Reply #4 - Oct 20th, 2012 at 6:58pm
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Okay I see what you mean, it always gives a disassembly report but there is a huge pause, longer for big projects.

Interesting it's the same problem we sometimes see when avrdude can't upload. I investigated the same problem using the arduino ide and found that while the avr programs can take a long time to terminate they actually return the correct output almost immediately.

Currently vm waits for the process to terminate before returning results. The arduino.exe, on the other hand, returns as soon as it gets any output and leaves the process in the background to terminate as and when.

So as soon as I get a mo I will look at re-coding the process launcher in vm. I've been meaning to do this for a while. Now we have something that is easy to reproduce and test it will be easier.

Hope you don't mind I have altered the title of the post slightly so that other users can see it more easily.
« Last Edit: Oct 20th, 2012 at 7:00pm by Tim@Visual Micro »  
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CapnBry
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Re: Disassembly View - Long pause, seems like a hang but isn't
Reply #5 - Oct 22nd, 2012 at 1:27pm
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Hrm that's interesting. It's not a big deal for me, especially once your next version will have a link to the output directory in the compiler results. I already have a batch file in my "sendto" menu that calls the avr-objdump so I just right-click -> send to -> disassemble. When it is integrated into Visual Studio it will just be that much more convenient.
  
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Marius
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Re: Disassembly View - Long pause, seems like a hang but isn't
Reply #6 - Oct 22nd, 2012 at 1:31pm
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Tim
The same happens in the release that I am testing.
  
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Tim@Visual Micro
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Re: Disassembly View - Long pause, seems like a hang but isn't
Reply #7 - Oct 22nd, 2012 at 1:31pm
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That sounds good. I have also added an option to use the latest winAVR which might (or might not) work better anyway.

Based on your comments I will also test with .net3.5, 4.0 and 4.5. I wonder if there is a difference. I didn't have time to look into it yesterday, I was testing something else in VS2008 but has disassembly switched on and it seemed to run very quickly.
« Last Edit: Oct 22nd, 2012 at 1:32pm by Tim@Visual Micro »  
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Re: Disassembly View - Long pause, seems like a hang but isn't
Reply #8 - Oct 22nd, 2012 at 1:33pm
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@Marius, thanks I am going to take a look at it as soon as next release is published.
  
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