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Parallel Tools Platform Parallel Debugger. Greg Watson Project Leader. Design Considerations. Parallel applications range from 2 to 128K processes Combined mult-process and threaded model is possible Some debug operations are performed on All or a subset of processes Individual processes

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Parallel Tools Platform Parallel Debugger

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Parallel Tools PlatformParallel Debugger

Greg Watson

Project Leader


Design Considerations

  • Parallel applications range from 2 to 128K processes

  • Combined mult-process and threaded model is possible

  • Some debug operations are performed on

    • All or a subset of processes

    • Individual processes

  • Processes are typically dependent on each other

  • Mixed language (e.g. C and Fortran) typical


Programming Models

  • Message passing model

    • Distinct processes exchange data using messages

    • Explicit send/receive and collective operations

  • Shared memory model

    • Data structures are shared

    • Locking or atomic operations required

  • Currently targeting message passing, shared memory later


Debugging Methodology

  • Breakpoint across all processes to synchronize

    • In master/worker, breakpoint only workers

  • Step all processes until error

    • Stepping one process typically not possible due to dependencies

  • Examine snapshot of data across all (or subset) of processes

  • Compare data from one process to another


Architecture Overview

  • Eclipse UI front end

    • Reuse Debug and CDI where possible

  • High level parallel debug API

    • Process sets used for efficiency

    • Asynchronous command/event model

    • Extension point to allow alternate backends

  • Backend (SDM)

    • Startup

    • Command broadcast

    • Event aggregation

    • MI only used for low level debug actions


UI Architecture

Platform Debug UI

CDT Debug UI

PTP Debug UI

ICDI

IPCDI

IPDebugger

IPDebugEvent

Commands

Events


Debug API

public interface IPDebugger {

publicvoid stepOver(BitList set, int count)

throws PCDIException;

...

}

publicinterface IPDebugEvent {

public BitList getSet();

...

}

101011010111111101011111

000000000111111101011111


SDM Architecture

ParallelDebugger

Command Broadcast

0

4

8

2

1

6

3

5

9

7


SDM Architecture

ParallelDebugger

Event Aggregation

0

4

8

2

1

6

3

5

9

7


AIF

  • Architecture Independent Format for data

  • Independent of endianness, word size, character size

  • Fully represents data type and value

  • Can be used to represent complex data structures, such as linked lists

  • Supports all C, C++ and Fortran types

  • C and Java (partial) implementations

  • Library operations:

    • Conversion to/from native format

    • Logical and arithmetic

    • Formatting and display


User Interface

  • Parallel Debug View

    • Global view of processes and process sets

    • Tooltips for fast variable access

    • Regiser/unregister process to display in Debug View

  • Parallel Breakpoint

    • Global - applies to all processes regardless of job or job size

    • Set-based - applies to a set of processes for a particular job

    • Color used to distinguish current set

  • Current line markers

    • Multiple markers allowed

    • Different markers for registered/unregistered processes

    • Text highlighting colors


User Interface (cont…)

  • Variable View

    • Supports AIF data

    • Only fetches complex data types when variables are expanded

  • Array View

    • Prototype using custom widget

    • Allows 2-D view (slice) of multi-dimensional arrays

    • Likely to move to memory view


Demo


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