[Vm-dev] start up performance regression on Mac OS X

[Eliot Miranda]

Hi All,

    in building new VMs today I see appalling startup performance on Mac OS
X.  It seems to be related to event setup and/or sound initialization.  I
ran under a debugger and interrupted while the system was (slowly)
launching and both times I saw a similar stack; see below.  So the system
looks to be caught in some kind of initialization loop:

    frame #7: 0x9331ff16
CoreAudio`HALC_ShellSimpleProxyList::Reconcile(bool, bool) + 646
    frame #8: 0x9331f569 CoreAudio`HALC_ShellPlugIn::ConnectToServer() + 153
    frame #9: 0x9338904e
CoreAudio`HAL_HardwarePlugIn_InitializeWithObjectID(AudioHardwarePlugInInterface**,
unsigned long) + 78
    frame #10: 0x9331d818 CoreAudio`HALPlugIn::Initialize() + 48
    frame #11: 0x9331c3a0
CoreAudio`HALPlugInManagement::CreateHALPlugIn(HALCFPlugIn const*) + 2048
    frame #12: 0x9331ac08 CoreAudio`HALPlugInManagement::Initialize() + 552
    frame #13: 0x93317070 CoreAudio`HALSystem::CheckOutInstance() + 190
    frame #14: 0x9331e4bb CoreAudio`AudioObjectGetPropertyData + 81
    frame #15: 0x92643947 AudioToolbox`AQMEIO_HAL::Init() + 201
    frame #16: 0x92643132
AudioToolbox`AQMEIOManager::_FindIOUnit(__CFString const*) + 110
    frame #17: 0x92642f23 AudioToolbox`AQMEDevice::InitPhase2(__CFString
const*) + 239
    frame #18: 0x92642e2e AudioToolbox`AQMixEngine_Single::InitPhase2() + 24
    frame #19: 0x92642a34 AudioToolbox`AQIONodeManager::_FindAQIONode(bool,
__CFString const*) + 154
    frame #20: 0x926426a9
AudioToolbox`AudioQueueObject::DoIONodeConnect(bool) + 963
    frame #21: 0x92715bfe
AudioToolbox`AudioQueueObject::GetIONodeConnection_Init(long&) + 40
    frame #22: 0x9270b7c6
AudioToolbox`AudioQueueObject::GetConverterConnection_Init(long&) + 20
    frame #23: 0x9265a77b
AudioToolbox`AudioQueueObject::AcquirePlayResources() + 215
    frame #24: 0x92709095 AudioToolbox`AudioQueueObject::Prime(unsigned
long, unsigned long&) + 345
    frame #25: 0x9265a571 AudioToolbox`AQServer_Prime + 95
    frame #26: 0x9265a43d AudioToolbox`AudioQueuePrime + 364
    frame #27: 0x0021c841 Squeak`-[sqSqueakSoundCoreAudio
snd_PlaySamplesFromAtLength:arrayIndex:startIndex:](self=0x0262e990,
_cmd="snd_PlaySamplesFromAtLength:arrayIndex:startIndex:", frameCount=2644,
arrayIndex="", startIndex=0) + 481 at sqSqueakSoundCoreAudio.m:319
    frame #28: 0x0021ed8d
Squeak`snd_PlaySamplesFromAtLength(frameCount=2644, arrayIndex=0xbfffb588,
startIndex=0) + 125 at sqSqueakSoundCoreAudioAPI.m:62
    frame #29: 0x0015358c Squeak`-[sqSqueakOSXApplication
setupSoundLogic](self=0x02408810, _cmd="setupSoundLogic") + 412 at
sqSqueakOSXApplication.m:152
    frame #30: 0x0016b5c9 Squeak`-[sqSqueakMainApplication
runSqueak](self=0x02408810, _cmd="runSqueak") + 617 at
sqSqueakMainApplication.m:198
    frame #31: 0x95216299 Foundation`__NSFirePerformWithOrder + 432
    frame #32: 0x9379a496
CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__
+ 22
    frame #33: 0x9379a3b2 CoreFoundation`__CFRunLoopDoObservers + 498
    frame #34: 0x9377d7fd CoreFoundation`__CFRunLoopRun + 1661
    frame #35: 0x9377ce51 CoreFoundation`CFRunLoopRunSpecific + 641
    frame #36: 0x9377cbba CoreFoundation`CFRunLoopRunInMode + 122
    frame #37: 0x92d7a37b HIToolbox`RunCurrentEventLoopInMode + 321
    frame #38: 0x92d79f5f HIToolbox`ReceiveNextEventCommon + 454
    frame #39: 0x92d79d7b
HIToolbox`_BlockUntilNextEventMatchingListInModeWithFilter + 71
    frame #40: 0x9137ab2d AppKit`_DPSNextEvent + 2101
    frame #41: 0x91aece90 AppKit`-[NSApplication(NSEvent)
_nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 2859
    frame #42: 0x91aec35d AppKit`-[NSApplication(NSEvent)
nextEventMatchingMask:untilDate:inMode:dequeue:] + 134
    frame #43: 0x9136fa7d AppKit`-[NSApplication run] + 763
    frame #44: 0x91341b3a AppKit`NSApplicationMain + 1228
    frame #45: 0x0016558b Squeak`main(argc=2, argv=0xbffff624,
envp=0xbffff630) + 91 at main.m:52
    frame #46: 0xa728f611 libdyld.dylib`start + 1


I changed sqSqueakOSXApplication.m in August, but only to add some option
processing.  Anyone have any ideas?

-- 
_,,,^..^,,,_
best, Eliot
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