Power, Performance, and Diagnostics
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- Clyde Little
- 5 years ago
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1 Core OS #WWDC14 Power, Performance, and Diagnostics What's new in GCD and XPC Session 716 Daniel Steffen Darwin Runtime Engineer 2014 Apple Inc. All rights reserved. Redistribution or public display not permitted without written permission from Apple.
2 Overview Background Quality of Service Classes New QoS and GCD API Propagation of QoS and Execution Context Diagnostics and Queue Debugging
3 Grand Central Dispatch Asynchronous execution Concurrent execution Synchronization
4 Asynchronous Execution
5 Asynchronous Execution GCD Run code in separate environment in same process
6 Asynchronous Execution GCD Run code in separate environment in same process Avoid interfering with current thread Different priority level Coordination between multiple clients
7 Asynchronous Execution XPC Run code in separate process
8 Asynchronous Execution XPC Run code in separate process Avoid interfering with current process Different privilege level Coordination between multiple clients
9 Previously On developer.apple.com Introducing Blocks and Grand Central Dispatch on iphone WWDC 2010 Simplifying iphone App Development with Grand Central Dispatch WWDC 2010 Introducing XPC WWDC 2011 Blocks and Grand Central Dispatch in Practice WWDC 2011 Mastering Grand Central Dispatch WWDC 2011 Asynchronous Design Patterns with Blocks, GCD, and XPC WWDC 2012 Efficient Design with XPC WWDC 2013
10 The Big Picture
11 Primary Goal Provide best user experience
12 Primary Goal Provide best user experience What is important to user?
13 Primary Goal Provide best user experience What is important to user? Frontmost app Responsive user interface
14 Responsive User Interface
15 Responsive User Interface Ensure resource availability for Main thread of frontmost app - UI event handling - UI drawing OS User Interface infrastructure
16 Responsive User Interface Other work should execute Off main thread Independently At lower priority
17 Priorities
18 Priorities Resolving resource contention
19 Priorities Resolving resource contention Under contention High priorities win
20 Priorities Resolving resource contention Under contention High priorities win No contention Low priorities have no restriction
21 Scheduling Priority Kernel scheduler High priorities get CPU first Low priorities - No restriction if no contention - May not run during UI activity
22 I/O Priority Background queue Low priority I/O No restriction if no high priority I/O present Otherwise deprioritized
23 Priorities Many other resource controls Complex configuration No unified approach No clear expression of intent
24 Quality of Service Classes
25 Quality of Service Classes Communicate developer intent Explicit classification of work Single abstract parameter Move away from dictating specific configuration values
26 Quality of Service Classes Effects CPU scheduling priority I/O priority Timer coalescing CPU throughput vs. efficiency More
27 Quality of Service Classes Effects CPU scheduling priority I/O priority Timer coalescing CPU throughput vs. efficiency More Configuration values tuned for each platform/device
28 QoS Classes UI IN UT BG User-Interactive User-Initiated Utility Background
29 User-Interactive UI thread Directly involved in Event handling UI drawing UI Small fraction of total work
30 User-Initiated Asynchronous to UI Directly UI-initiated User waiting for immediate results Required to continue user interaction IN
31 Utility Long-running with user-visible progress Computation, I/O, networking Ongoing data feed to UI Getting ready for next UI request UT Energy efficient
32 Background User is unaware work is occurring Prefetching Deferrable Maintenance BG
33 Choosing QoS Class UI User Interactive Is this work actively involved in updating the UI? IN User Initiated Is this work required to continue user interaction? UT Utility Is the user aware of the progress of this work? BG Background Can this work be deferred to start at a better time?
34 Choosing QoS Class UI User Interactive Is this work actively involved in updating the UI? IN User Initiated Is this work required to continue user interaction? UT Utility Is the user aware of the progress of this work? BG Background Can this work be deferred to start at a better time?
35 Choosing QoS Class UI User Interactive Is this work actively involved in updating the UI? IN User Initiated Is this work required to continue user interaction? UT Utility Is the user aware of the progress of this work? BG Background Can this work be deferred to start at a better time?
36 Choosing QoS Class UI User Interactive Is this work actively involved in updating the UI? IN User Initiated Is this work required to continue user interaction? UT Utility Is the user aware of the progress of this work? BG Background Can this work be deferred to start at a better time?
37 Choosing QoS Class UI User Interactive Is this work actively involved in updating the UI? IN User Initiated Is this work required to continue user interaction? UT Utility Is the user aware of the progress of this work? BG Background Can this work be deferred to start at a better time?
38 Choosing QoS Class UI User Interactive Is it okay for User Interactive work to happen before my work? IN User Initiated Is it okay for this work to compete with other User Initiated work? UT Utility Is it okay for my work to take precedence over Utility work? BG Background
39 Choosing QoS Class UI User Interactive Is it okay for User Interactive work to happen before my work? IN User Initiated Is it okay for this work to compete with other User Initiated work? UT Utility Is it okay for my work to take precedence over Utility work? BG Background
40 Choosing QoS Class UI User Interactive Is it okay for User Interactive work to happen before my work? IN User Initiated Is it okay for this work to compete with other User Initiated work? UT Utility Is it okay for my work to take precedence over Utility work? BG Background
41 Recap Responsive User Interface Asynchronous execution at correct priority Had no unified way to express intent Quality of Service Classes Explicit abstract classification of work Questions for choosing QoS
42 QoS Class API
43 QoS Class Can be specified on Threads Dispatch Queues Dispatch Blocks NSOperationQueue/NSOperation Processes
44 QoS Class Constants UI IN sys/qos.h QOS_CLASS_USER_INTERACTIVE QOS_CLASS_USER_INITIATED Foundation.h NSQualityOfServiceUserInteractive NSQualityOfServiceUserInitiated UT BG QOS_CLASS_UTILITY QOS_CLASS_BACKGROUND NSQualityOfServiceUtility NSQualityOfServiceBackground
45 QoS Class Constants UI IN DF UT BG sys/qos.h QOS_CLASS_USER_INTERACTIVE QOS_CLASS_USER_INITIATED QOS_CLASS_DEFAULT QOS_CLASS_UTILITY QOS_CLASS_BACKGROUND QOS_CLASS_UNSPECIFIED Foundation.h NSQualityOfServiceUserInteractive NSQualityOfServiceUserInitiated NSQualityOfServiceUtility NSQualityOfServiceBackground
46 Special QoS Class Values QOS_CLASS_DEFAULT No specific QoS information was available Ordered between UI and non-ui QoS Thread and global queue default UI IN User Interactive User Initiated Not intended as a work classification DF Default UT Utility BG Background
47 Special QoS Class Values QOS_CLASS_UNSPECIFIED No QoS specification at given level QoS should be inferred from work origin Returned after legacy API QoS opt-out
48 QoS Relative Priority Relative position within a QoS Class band
49 QoS Relative Priority Relative position within a QoS Class band UI IN DF UT BG
50 QoS Relative Priority Relative position within a QoS Class band UI IN DF UT BG
51 QoS Relative Priority Relative position within a QoS Class band Lower than default UI 0-15 IN DF UT BG
52 QoS Relative Priority Relative position within a QoS Class band Lower than default Intended for unusual situations Interdependent work within same QoS class with differing priority Producer/Consumer scenarios UI IN DF 0-15 UT BG
53 Thread QoS API
54 Thread QoS Getters QoS Class of current thread qos = qos_class_self(); Initial QoS Class of main thread qos = qos_class_main();
55 Thread QoS Getters QoS Class of current thread qos = qos_class_self(); Initial QoS Class of main thread qos = qos_class_main();
56 Thread QoS Getters QoS Class of current thread qos = qos_class_self(); Process Type App Main QoS User-Interactive Initial QoS Class of main thread qos = qos_class_main(); XPC Service Default
57 GCD QoS API
58 Global Queues QoS Class Global Queue UI User Interactive Main IN User Initiated High priority concurrent DF Default Default priority concurrent UT Utility Low priority concurrent BG Background Background priority concurrent
59 Global Queues QoS Class Global Queue UI User Interactive Main IN User Initiated High priority concurrent DF Default Default priority concurrent UT Utility Low priority concurrent BG Background Background priority concurrent
60 Global Queues with QoS Get a global concurrent queue with QoS Class queue = dispatch_get_global_queue(qos_class_utility, 0); Get QoS Class of a queue qos = dispatch_queue_get_qos_class(queue, &relative);
61 Global Queues with QoS Get a global concurrent queue with QoS Class queue = dispatch_get_global_queue(qos_class_utility, 0); Get QoS Class of a queue qos = dispatch_queue_get_qos_class(queue, &relative);
62 Global Queues with QoS Get a global concurrent queue with QoS Class queue = dispatch_get_global_queue(qos_class_utility, 0); Get QoS Class of a queue qos = dispatch_queue_get_qos_class(queue, &relative);
63 Queue QoS API Get QoS queue attribute: qos_attr = dispatch_queue_attr_make_with_qos_class( attr, QOS_CLASS_UTILITY, 0);
64 Queue QoS API Get QoS queue attribute: qos_attr = dispatch_queue_attr_make_with_qos_class( attr, QOS_CLASS_UTILITY, 0);
65 Queue QoS API Get QoS queue attribute: qos_attr = dispatch_queue_attr_make_with_qos_class( attr, QOS_CLASS_UTILITY, 0); queue = dispatch_queue_create( com.my.utility, qos_attr);
66 Dispatch Block Objects
67 Dispatch Block Objects Configure properties of individual units of work on a queue
68 Dispatch Block Objects Configure properties of individual units of work on a queue Address individual workunits for Wait for completion Completion notification Cancellation
69 Dispatch Block Objects Configure properties of individual units of work on a queue Address individual workunits for Wait for completion Completion notification Cancellation Integrate with existing API
70 Dispatch Block Objects Wrapper Block Created from an existing GCD Block dispatch_block_t ^{ }
71 Dispatch Block Objects Wrapper Block Created from an existing GCD Block dispatch_block_t Additional configuration QoS Class ^{ } Flags
72 Dispatch Block Objects Wrapper Block Created from an existing GCD Block dispatch_block_t Additional configuration QoS Class ^{ } Flags Heap object Block_release()
73 GCD Block API dispatch_block_t block; block = dispatch_block_create(0, ^{ NSLog(@ Hello World ); }); dispatch_async(queue, block); // Do some work dispatch_wait(block, DISPATCH_TIME_FOREVER); Block_release(block);
74 GCD Block API dispatch_block_t block; block = dispatch_block_create(0, ^{ NSLog(@ Hello World ); }); dispatch_async(queue, block); // Do some work dispatch_wait(block, DISPATCH_TIME_FOREVER); Block_release(block);
75 GCD Block API dispatch_block_t block; block = dispatch_block_create(0, ^{ NSLog(@ Hello World ); }); dispatch_async(queue, block); // Do some work dispatch_wait(block, DISPATCH_TIME_FOREVER); Block_release(block);
76 GCD Block API dispatch_block_t block; block = dispatch_block_create(0, ^{ NSLog(@ Hello World ); }); dispatch_async(queue, block); // Do some work dispatch_wait(block, DISPATCH_TIME_FOREVER); Block_release(block);
77 GCD Block API dispatch_block_t block; block = dispatch_block_create(0, ^{ NSLog(@ Hello World ); }); dispatch_async(queue, block); // Do some work dispatch_wait(block, DISPATCH_TIME_FOREVER); Block_release(block);
78 GCD Block API dispatch_block_t block; block = dispatch_block_create(0, ^{ NSLog(@ Hello World ); }); dispatch_async(queue, block); // Do some work dispatch_wait(block, DISPATCH_TIME_FOREVER); Block_release(block);
79 GCD Block API dispatch_block_t block; block = dispatch_block_create(0, ^{ NSLog(@ Hello World ); }); dispatch_async(queue, block); // Do some work dispatch_wait(block, DISPATCH_TIME_FOREVER); Block_release(block);
80 GCD Block API dispatch_block_t block; block = dispatch_block_create_with_qos_class( 0, QOS_CLASS_UTILITY, -8, ^{ }); dispatch_async(queue, block); // Do some work // Change your mind dispatch_cancel(block); Block_release(block);
81 GCD Block API dispatch_block_t block; block = dispatch_block_create_with_qos_class( 0, QOS_CLASS_UTILITY, -8, ^{ }); dispatch_async(queue, block); // Do some work // Change your mind dispatch_cancel(block); Block_release(block);
82 GCD Block API dispatch_block_t block; block = dispatch_block_create_with_qos_class( 0, QOS_CLASS_UTILITY, -8, ^{ }); dispatch_async(queue, block); // Do some work // Change your mind dispatch_cancel(block); Block_release(block);
83 GCD Block API dispatch_block_t block; block = dispatch_block_create_with_qos_class( 0, QOS_CLASS_UTILITY, -8, ^{ }); dispatch_async(queue, block); // Do some work // Change your mind dispatch_cancel(block); Block_release(block);
84 GCD Block API dispatch_block_t block; block = dispatch_block_create_with_qos_class( 0, QOS_CLASS_UTILITY, -8, ^{ }); dispatch_async(queue, block); // Do some work // Change your mind dispatch_cancel(block); Block_release(block);
85 GCD Block API dispatch_block_t block; block = dispatch_block_create(dispatch_block_detached, ^{ // Clean caches }); dispatch_async(queue, block); dispatch_notify(block, dispatch_get_main_queue(), ^{ // Cleanup complete }); Block_release(block);
86 GCD Block API dispatch_block_t block; block = dispatch_block_create(dispatch_block_detached, ^{ // Clean caches }); dispatch_async(queue, block); dispatch_notify(block, dispatch_get_main_queue(), ^{ // Cleanup complete }); Block_release(block);
87 GCD Block API dispatch_block_t block; block = dispatch_block_create(dispatch_block_detached, ^{ // Clean caches }); dispatch_async(queue, block); dispatch_notify(block, dispatch_get_main_queue(), ^{ // Cleanup complete }); Block_release(block);
88 GCD Block API dispatch_block_t block; block = dispatch_block_create(dispatch_block_detached, ^{ // Clean caches }); dispatch_async(queue, block); dispatch_notify(block, dispatch_get_main_queue(), ^{ // Cleanup complete }); Block_release(block);
89 Interaction of QoS Specifications
90 Interaction of Multiple QoS Specifications Asynchronous Blocks Default to QoS class of queue Or inherited from immediate global target queue
91 Interaction of Multiple QoS Specifications Asynchronous Blocks Default to QoS class of queue Or inherited from immediate global target queue If neither are specified Use Block QoS class Or QoS inferred from submitting thread
92 Interaction of Multiple QoS Specifications Inferred QoS QoS captured at the time of block submission User Interactive translated to User Initiated
93 Interaction of Multiple QoS Specifications Inferred QoS QoS captured at the time of block submission User Interactive translated to User Initiated Intended for use on queues Without specific identity or single purpose Mediating between many different clients
94 Interaction of Multiple QoS Specifications Synchronous Blocks Default to QoS class of Block Or current thread Will only raise QoS
95 Interaction of Multiple QoS Specifications Explicit control DISPATCH_BLOCK_INHERIT_QOS_CLASS Prefer queue/thread QoS DISPATCH_BLOCK_ENFORCE_QOS_CLASS Prefer Block QoS Only if higher than queue/thread QoS
96 Interaction of Multiple QoS Specifications Explicit control DISPATCH_BLOCK_INHERIT_QOS_CLASS Prefer queue/thread QoS DISPATCH_BLOCK_ENFORCE_QOS_CLASS Prefer Block QoS Only if higher than queue/thread QoS
97 Priority Inversions
98 Priority Inversion Progress of high-priority work depends on Results of low-priority work Resource held by low-priority work
99 Priority Inversion Progress of high-priority work depends on Results of low-priority work Resource held by low-priority work High-priority threads are Blocking Spinning/polling Waiting for low-priority threads
100 Priority Inversion Synchronous High QoS thread waiting on lower QoS work
101 Priority Inversion Synchronous High QoS thread waiting on lower QoS work System will attempt to automatically resolve inversion for dispatch_sync() and dispatch_wait() of blocks on serial queues pthread_mutex_lock() QoS of work is raised for the duration of the wait
102 Priority Inversion Asynchronous High QoS Block submitted to serial queue Created with lower QoS Containing Blocks with lower QoS
103 Priority Inversion Asynchronous High QoS Block submitted to serial queue Created with lower QoS Containing Blocks with lower QoS System will attempt to automatically resolve inversion QoS of queue is raised until high QoS Block is reached
104 Avoiding Priority Inversions Decouple shared data as much as possible Use finer grained synchronization Move work outside of lock/serial queue
105 Avoiding Priority Inversions Decouple shared data as much as possible Use finer grained synchronization Move work outside of lock/serial queue Prefer asynchronous execution over synchronous waiting
106 Avoiding Priority Inversions Decouple shared data as much as possible Use finer grained synchronization Move work outside of lock/serial queue Prefer asynchronous execution over synchronous waiting Avoid spinning/polling Look out for timer-based synchronization
107 Recap QoS Class constants QoS relative priority Thread and queue QoS API Dispatch Block API Interaction of multiple QoS specifications Priority Inversions
108 Propagation of Execution Context
109 Execution Context Thread-local attributes maintained by system Activity ID Properties of current IPC request - Originator - Importance - More
110 Execution Context Automatic propagation
111 Execution Context Automatic propagation Propagated across threads GCD NSOperationQueue Foundation
112 Execution Context Automatic propagation Propagated across threads GCD NSOperationQueue Foundation Propagated across processes XPC MIG CFMachPort
113 Automatic Propagation Process A
114 Automatic Propagation Process A Q1 AID: 1 Q2 AID: 2
115 Automatic Propagation Process A Q1 AID: 1 Q2 AID: 2 Q3 AID: 1
116 Automatic Propagation Process A Q1 AID: 1 Q2 AID: 2 Q3 AID: 1 Process B Q1 AID: 1
117 Automatic Propagation Process A Q1 AID: 1 Q2 AID: 2 Q3 AID: 1 Process B Q1 AID: 1 Q2 AID: 1
118 Automatic Propagation Process A Q1 AID: 1 Q2 AID: 2 Q3 AID: 1 Process B Q1 AID: 1 Q2 AID: 1 Q3 AID: 2
119 Propagation Control Prevent propagation DISPATCH_BLOCK_DETACHED Work disassociated from principal activity Asynchronous, long-running cleanup
120 Propagation Control Prevent propagation DISPATCH_BLOCK_DETACHED Work disassociated from principal activity Asynchronous, long-running cleanup Detached by default Dispatch source handlers dispatch_after()
121 Detached Block Q1 AID: 1
122 Detached Block Q1 AID: 1 Q3 AID: 1
123 Detached Block Q1 Q2 Q3 AID: 1 AID: 1
124 Detached Block Q1 Q2 Q3 AID: 1 AID: 2 AID: 1
125 Propagation Control Manual propagation DISPATCH_BLOCK_ASSIGN_CURRENT Assigns current QoS Class and Execution Context
126 Propagation Control Manual propagation DISPATCH_BLOCK_ASSIGN_CURRENT Assigns current QoS Class and Execution Context Store Block for later execution Direct call on manually created pthread Submission to dispatch queue
127 XPC Propagation XPC connections automatically propagate QoS Class Execution Context
128 XPC Propagation XPC connections automatically propagate QoS Class Execution Context Capture of current state on sending thread
129 XPC Propagation XPC connections automatically propagate QoS Class Execution Context Capture of current state on sending thread XPC handlers prefer propagated QoS over queue QoS
130 XPC Service Importance boosting Initially clamped to Background QoS Clamp removed during IPC with UI
131 XPC Service Importance boosting Initially clamped to Background QoS Clamp removed during IPC with UI Boost lifetime automatically handled by XPC Until reply is sent While using message
132 XPC Service Importance boosting Initially clamped to Background QoS Clamp removed during IPC with UI Boost lifetime automatically handled by XPC Until reply is sent While using message While asynchronous work submitted from handler context is ongoing - Ensure unrelated work is detached
133 Recap Execution Context attributes Automatic propagation of Execution Context and QoS Manual propagation control XPC propagation and importance boosting
134 Diagnostics and Queue Debugging Xcode 6 CPU Report Xcode 6 Queue Debugging Activity Tracing
135 Diagnostics and Queue Debugging Xcode 6 CPU Report Xcode 6 Queue Debugging Activity Tracing
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141 Diagnostics and Queue Debugging Xcode 6 CPU Report Xcode 6 Queue Debugging Activity Tracing
142 Logical Backtraces
143 Logical Backtraces
144 Logical Backtraces
145 Logical Backtraces
146 Pending Blocks
147 Pending Blocks
148 Pending Blocks
149 Pending Blocks
150 Diagnostics and Queue Debugging Xcode 6 CPU Report Xcode 6 Queue Debugging Activity Tracing
151 Activities in Crash Reports Crashed Thread: Exception Type: Exception Codes: 0 Dispatch queue: com.apple.main-thread EXC_CRASH (SIGABRT) 0x , 0x Breadcrumb Trail (reverse chronological seconds): 6 Additional Query directory info about using NSRunLoop key events (Activity leading ID: 0x f ) up to crash 15 Query directory using NSRunLoop Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 com.apple.query-directory 0x ea -[QDAppDelegate query:foundresults:error:] com.apple.opendirectory 0x00007fff9066ec88 delegate_callback com.apple.cfopendirectory 0x00007fff84750bed _query_perform com.apple.corefoundation 0x00007fff8964e1f1 CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION com.apple.appkit 0x00007fff83c01a9e NSApplicationMain com.apple.query-directory 0x a82 main libdyld.dylib 0x00007fff874af5c9 start + 1 Activity ID: 0x f Activity Name: sendaction: Activity Breadcrumb: Query directory using NSRunLoop Activity Running Time: sec Activity Failure Reason: none detected Trace Messages (reverse chronological seconds): Query Directory 0x IPC send Query Directory Detailed messages 0x e0 associated aborting with the test crash due to no point results Query Directory 0x IPC send Query Directory 0x skipping record with UID 210 (not member of 'admin') opendirectoryd 0xffffffff IPC send opendirectoryd 0xffffffff00021c21 request completed, delivered 1 results opendirectoryd 0xffffffff UID: 4129, EUID: 4129, GID: 11, EGID: opendirectoryd 0xffffffff IPC receive Query Directory 0x IPC send
152 Activities in Crash Reports Crashed Thread: Exception Type: Exception Codes: 0 Dispatch queue: com.apple.main-thread EXC_CRASH (SIGABRT) 0x , 0x Breadcrumb Trail (reverse chronological seconds): 6 Query directory using NSRunLoop (Activity ID: 0x f ) 15 Query directory using NSRunLoop Breadcrumb Trail (reverse chronological seconds): 6 Query directory using NSRunLoop (Activity ID: 0x f ) 15 Query directory using NSRunLoop Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 com.apple.query-directory 0x ea -[QDAppDelegate query:foundresults:error:] com.apple.opendirectory 0x00007fff9066ec88 delegate_callback com.apple.cfopendirectory 0x00007fff84750bed _query_perform com.apple.corefoundation 0x00007fff8964e1f1 CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION com.apple.appkit 0x00007fff83c01a9e NSApplicationMain com.apple.query-directory 0x a82 main libdyld.dylib 0x00007fff874af5c9 start + 1 Activity ID: 0x f Activity Name: sendaction: Activity Breadcrumb: Query directory using NSRunLoop Activity Running Time: sec Activity Failure Reason: none detected Trace Messages (reverse chronological seconds): Query Directory 0x IPC send Query Directory 0x e0 aborting test due to no results Query Directory 0x IPC send Query Directory 0x skipping record with UID 210 (not member of 'admin') opendirectoryd 0xffffffff IPC send opendirectoryd 0xffffffff00021c21 request completed, delivered 1 results opendirectoryd 0xffffffff UID: 4129, EUID: 4129, GID: 11, EGID: opendirectoryd 0xffffffff IPC receive Query Directory 0x IPC send
153 Activities in Crash Reports Crashed Thread: Exception Type: Exception Codes: 0 Dispatch queue: com.apple.main-thread EXC_CRASH (SIGABRT) 0x , 0x Breadcrumb Trail (reverse chronological seconds): 6 Query directory using NSRunLoop (Activity ID: 0x f ) 15 Query directory using NSRunLoop Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 com.apple.query-directory 0x ea -[QDAppDelegate query:foundresults:error:] x f com.apple.opendirectory 0x00007fff9066ec88 delegate_callback com.apple.cfopendirectory 0x00007fff84750bed sendaction: _query_perform com.apple.corefoundation 0x00007fff8964e1f1 CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 17 Query directory using NSRunLoop 16 com.apple.appkit 0x00007fff83c01a9e NSApplicationMain com.apple.query-directory 0x a main + 34 sec 18 libdyld.dylib 0x00007fff874af5c9 start + 1 Activity ID: Activity Name: Activity Breadcrumb: Activity Running Time: Activity Failure Reason: none detected Activity ID: 0x f Activity Name: sendaction: Activity Breadcrumb: Query directory using NSRunLoop Activity Running Time: sec Activity Failure Reason: none detected Trace Messages (reverse chronological seconds): Query Directory 0x IPC send Query Directory 0x e0 aborting test due to no results Query Directory 0x IPC send Query Directory 0x skipping record with UID 210 (not member of 'admin') opendirectoryd 0xffffffff IPC send opendirectoryd 0xffffffff00021c21 request completed, delivered 1 results opendirectoryd 0xffffffff UID: 4129, EUID: 4129, GID: 11, EGID: opendirectoryd 0xffffffff IPC receive Query Directory 0x IPC send
154 Activities in Crash Reports Crashed Thread: 0 Dispatch queue: com.apple.main-thread Exception Type: EXC_CRASH (SIGABRT) Exception Codes: 0x , 0x Breadcrumb Trail (reverse chronological seconds): 6 Query directory using NSRunLoop (Activity ID: 0x f ) 15 Query directory using NSRunLoop Trace Thread Messages 0 Crashed:: (reverse Dispatch chronological queue: com.apple.main-thread seconds): com.apple.query-directory 0x ea 0x [QDAppDelegate IPC query:foundresults:error:] send com.apple.opendirectory Query 0x00007fff9066ec88 0x e0 delegate_callback aborting test due to no results com.apple.cfopendirectory Query 0x00007fff84750bed 0x _query_perform IPC send com.apple.corefoundation Query Directory 0x00007fff8964e1f1 0x CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION skipping record with UID 210 (not member + of 17 'admin') opendirectoryd 0xffffffff IPC send 16 com.apple.appkit 0x00007fff83c01a9e NSApplicationMain com.apple.query-directory opendirectoryd 0x a82 0xffffffff00021c21 main + 34 request completed, delivered 1 results 18 libdyld.dylib 0x00007fff874af5c9 start opendirectoryd 0xffffffff UID: 4129, EUID: 4129, GID: 11, EGID: Activity ID: opendirectoryd 0x f xffffffff IPC receive Activity Name: Query Directory sendaction: 0x IPC send Activity Breadcrumb: Query directory using NSRunLoop Activity Running Time: sec Activity Failure Reason: none detected Trace Messages (reverse chronological seconds): Query Directory 0x IPC send Query Directory 0x e0 aborting test due to no results Query Directory 0x IPC send Query Directory 0x skipping record with UID 210 (not member of 'admin') opendirectoryd 0xffffffff IPC send opendirectoryd 0xffffffff00021c21 request completed, delivered 1 results opendirectoryd 0xffffffff UID: 4129, EUID: 4129, GID: 11, EGID: opendirectoryd 0xffffffff IPC receive Query Directory 0x IPC send
155 Using lldb (lldb) thread info thread #1: tid = 0x1c93, 0x00007fff9452a37a libsystem_kernel.dylib` pthread_kill + 10, queue = 'com.apple.main-thread', activity = 'sendaction:', 5 messages, stop reason = signal SIGABRT Activity 'sendaction:', 0x4d Current Breadcrumb: Query directory using NSRunLoop 5 trace messages: aborting test due to no results skipping record with UID 210 (not member of 'admin') IPC send issued query canceling previous query for mode: 0
156 Using lldb (lldb) thread info thread #1: tid = 0x1c93, 0x00007fff9452a37a libsystem_kernel.dylib` pthread_kill + 10, queue = 'com.apple.main-thread', activity = 'sendaction:', 5 messages, stop reason = signal SIGABRT Activity 'sendaction:', 0x4d Current Breadcrumb: Query directory using NSRunLoop 5 trace messages: aborting test due to no results skipping record with UID 210 (not member of 'admin') IPC send issued query canceling previous query for mode: 0
157 Summary Background Quality of Service Classes New QoS and GCD API Propagation of QoS and Execution Context Diagnostics and Queue Debugging
158 More Information Paul Danbold Core OS Technologies Evangelist Documentation Grand Central Dispatch (GCD) Reference Concurrency Programming Guide Apple Developer Forums
159 Related Sessions Improving Your App with Instruments Nob Hill Tuesday 4:30PM Writing Energy Efficient Code, Part 1 Russian Hill Wednesday 10:15AM Debugging in Xcode 6 Marina Wednesday 10:15AM Writing Energy Efficient Code, Part 2 Russian Hill Wednesday 11:30AM Fix Bugs Faster using Activity Tracing Russian Hill Thursday 11:30AM
160 Labs Power and Performance Lab Core OS Lab A Thursday 3:15PM Core OS Lab Open Hours Core OS Lab A and B Friday 2:00PM
161
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