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| − | This sub-group is focused on improving the workflow of multi-context debugging. ''Multi-context'' refers to simultaneous debugging of multiple cores, processes, threads, or other objects which are represented in standard debugger views.
| + | The work tracked by this page has moved to this [[CDT/designs/MultiCoreDebug| new page]] as part of the CDT project. |
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| − | == Use Cases ==
| + | The Multi-core Debugging Work Group page can be found [[CDT/MultiCoreDebugWorkingGroup|here]]. |
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| − | '''Format:'''
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| − | * ''Family of use cases''
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| − | *; ''Use case'' : ''Description of the use case''
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| − | *:; ''Scenario'':
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| − | *:;:* ''Step''
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| − | * I. Programs with multiple threads
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| − | *;1 Two or more threads interacting : User is debugging a program with multiple threads which are interacting with each other.
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| − | *:; a) Debugging threads which contend for the same lock. :
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| − | *:;:# When a thread blocks while stepping,
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| − | *:;:# User switches focus to another thread and steps until the lock is released,
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| − | *:;:# User switches focus back to the first thread and continues debugging.
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| − | *:; b) Debugging race conditions where multiple threads are reading and writing some shared data :
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| − | *:;:# User sets a breakpoint at a location where a shared variable is written.
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| − | *:;:# Multiple threads hit the breakpoint
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| − | *:;:# User looks at each threads to see the thread-private data in each thread.
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| − | *:;:# User steps the threads individually to watch what happens to the shared data.
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| − | *:;:# Alternatively, user steps all threads.
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| − | *:;:# Multiple threads may hit the breakpoint at the same time.
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| − | *:;:# User sets another breakpoint further down in routines that access the shared data.
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| − | *:;:# User continues some or all of the threads which stopped at the first breakpoint so that they may reach the second breakpoint.
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| − | *;2 Debugging a subset of threads : User is debugging a program with multiple threads, but he is interested only in interacting with some of the threads.
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| − | *:; a) User debugs with breakpoints restricted to a sub-set of threads.
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| − | *:;:# User creates a breakpoint on the routine to be debugged.
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| − | *:;:# User defines which threads should be allowed to hit the breakpoint.
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| − | *:;:# The threads hit the breakpoint and user steps through them.
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| − | *:; b) Run control for a subset of threads : User repeatedly suspends and resumes a subset of threads.
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| − | *:; c) Terminating/re-launching :
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| − | *:;:# User debugs a subset of threads (using filtered breakpoints, etc.).
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| − | *:;:# User terminates and relaunches a process, and continues to debug the same set of threads.
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| − | *;3 Program with large number (100+) of threads : User is debugging programs with large numbers of threads and he needs to manage those threads effectively.
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| − | *:; a) User needs to switch between suspended threads
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| − | *:;:# User sets a breakpoint that some threads may hit.
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| − | *:;:# Some threads hit the breakpoint.
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| − | *:;:# User switches focus between suspended threads to control them and examine their data.
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| − | *:; b) Threads created/destroyed rapidly: User is debugging a process with threads being created and destroyed at a rapid rate (more than 1 thread/sec.)
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| − | * II. Multiple processes that interact with each other
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| − | * III. Systems with multiple cores
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| − | == Problems with Current Workflow ==
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| − | == Proposed Changes ==
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| − | == Old Documents ==
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| − | This sub-group was created following a discussion about platform debug dev: [http://dev.eclipse.org/mhonarc/lists/platform-debug-dev/msg01179.html "ideas for improving multi-context debugging"].
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| − | * [[DSDP/DD/MultiContext_UnlinkViewContextProposal|Unlink View Context proposal]]
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