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Xcode 4 excruciatingly unresponsive

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Xcode 4 excruciatingly unresponsive

Subject: Xcode 4 excruciatingly unresponsive
From: James Bucanek <email@hidden>
Date: Tue, 19 Apr 2011 11:07:10 -0700

Hello all,

I've been struggling with Xcode 4, and my latest problem is that is it excruciatingly sluggish. About every 20 seconds, it hangs for 5 to 10 seconds. Needless to say, it's really eating into my productivity, not to mention my nerves. Try using code completion when every third time you get the spinning technical pizza of death for 5 seconds.

Running Spin Control, I log a lot of samples that look like this:

    716 Thread_170935   DispatchQueue_1: com.apple.main-thread  (serial)
      716 0x100000eec
        716 NSApplicationMain
          716 -[NSApplication run]
            715 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:]
              715 _DPSNextEvent
                715 BlockUntilNextEventMatchingListInMode
                  715 ReceiveNextEventCommon
                    715 RunCurrentEventLoopInMode
                      715 CFRunLoopRunSpecific
                        715 __CFRunLoopRun
                          709 __NSFireDelayedPerform
                            709 -[DVTDelayedValidator doValidation:]
                              709 -[IDEWorkspaceDocument writeStateData]
                                687 -[DVTStateRepository stateDataOrError:]
                                  568 -[NSKeyedArchiver finishEncoding]
                                    567 _CFPropertyListCreateXMLData
                                      567 _CFAppendXML0
                                        567 _CFAppendXML0
                                          564 _CFAppendXML0
                                            395 _CFAppendXML0
                                              271 _CFAppendXML0
                                                222 _plistAppendFormat
                                                ...

It would appear that every few seconds, Xcode decides to create some monster XML document that hangs the main thread for several seconds. There is usually a garbage collection thread that's running at the same time, which also might be slowing down the main thread as I find lots of sample stack fragments like this:

64 _CFStringAppendFormatAndArgumentsAux 62 __CFStringAppendBytes 60 __CFStringChangeSizeMultiple 45 __CFStrAllocateMutableContents 43 auto_zone_allocate_object 42 Auto::Zone::block_allocate(Auto::Thread&, unsigned long, unsigned int, bool, bool) 40 __spin_lock

Anyway, I'm putting this out there hoping that someone might know some trick that will stop this. I'd also be happy to file a bug report, if that would help. I have *lots* of these Spin Control samples.

James


James Bucanek
____________________________________________________________________
Author of Professional Xcode 3                   ISBN: 9780470525227
<http://www.proxcode3.com/>
and Learn Objective-C for Java Developers        ISBN: 9781430223696
<http://objectivec4java.com/>

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Re: Xcode 4 excruciatingly unresponsive
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