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The MPI Testing Tool MTT

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The MPI Testing Tool (MTT)? Ethan Mallove - Sun ... The problem with testing MPI ... The combinatoric explodes ... Case Study: The Open MPI Project (cont. ... – PowerPoint PPT presentation

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Title: The MPI Testing Tool MTT


1
The MPI Testing Tool (MTT)?
  • Ethan Mallove - Sun Microsystems
  • Jeff Squyres - Cisco Systems
  • Josh Hursey - Indiana University
  • Andrew Lumsdaine - Indiana University
  • EuroPVM/MPI 2007

2
Overview
  • Why MTT?
  • MTT Usage
  • Configuration
  • Test specification
  • Test execution
  • Reporting Tool
  • Case study

3
The problem with testing MPI
  • Portable MPI implementation needs regular
    (correctness and performance) testing
  • On multiple platforms / architectures / operating
    systems
  • Across multiple organizations / environments
  • With many different test suites
  • Exercising hundreds of run-time configuration
    options
  • Require repeatability

4
Available testing frameworks
  • TET no software retrieval
  • Perfbase storage model did not meet our
    requirements
  • DejaGNU test creator
  • Others Dart, Boost, Mozilla Tinderbox, Testopia,
    Buildbot, etc.

5
Testing Flow
  • MPI Get obtain the MPI implementation(s) to test
  • MPI Install install the MPI implementation(s)?
  • Test Get obtain the test suite(s) to run
  • Test Build build the test suite(s) against each
    MPI implementation
  • Test Run run all the test suite(s) against each
    MPI implementation

6
Testing Flow (cont.)?
7
MTT Configuration
  • INI-style text file
  • MPI Details section - how to run a job under this
    MPI
  • MPI get/install sections - how to obtain /
    install MPI
  • Test get/build/run sections - how to obtain /
    install / what tests to run
  • Reporter section - what to do with the results

8
MTT Funclets
  • Perl-like functions used in the INI file to do
    the following
  • Multiplicative effectexec mpirun -np _at_np_at_
    executable()np enumerate(2, 4, 8, 16)?
  • Logicpass eq(wifexited(), 0)timeout
    max(30, multiply(10, test_np()))?

9
MTT Design
  • The client is written in Perl
  • Modular plug-in framework
  • Plug-ins for
  • MPI specific functionality
  • Test suite specific functionality
  • Reporter specific functionality

10
MTT Test Specification
  • Plug-ins carry out
  • Complex builds
  • Test grouping
  • Control over pass/fail/time-out conditions

11
MTT Test Execution
  • Managed via MPI Details INI sections
  • Flexible enough to test any MPI
  • Examples

MPI Details MPICH exec mpirun -np 2
executable()? MPI Details Open MPI exec
mpirun --mca btl _at_btls_at_ -np np()
executable()? btls enumerate("self,sm,tcp",
"self,sm,openib")?
12
MTT Reports
Web-driven reporting tool covers many use cases
for searching on test results
  • High-level summaries
  • Root causing
  • Performance results
  • E-mailed reports and permalinks

13
MTT Reporting Tool
  • Web-driven tool
  • "Drill down" and color-coded approach to managing
    sea of test results
  • Summary and Detail views
  • Results are never discarded
  • Flexible search engine

14
Case Study The Open MPI Project
  • Multitude of runtime parameters
  • Many configurations
  • Many platforms
  • Many test suites
  • etc.

The combinatoric explodes ...
15
Case Study The Open MPI Project (cont.)?
  • Leverage a pool of software/hardware testing
    resources
  • Unite the community of developers and testers
  • Central store of test results makes collaboration
    easier

16
MTT Future Work
  • Heterogeneous testing environments
  • "Disconnected" scenarios (e.g., build on one
    machine, run in another)?
  • Build parallelism into the testing framework
  • Generalize for other software

17
Try MTT Yourselves!
  • http//www.open-mpi.org/projects/mtt

18
MTT Reports
19
Summary
  • Summarize the most important points of your
    presentation here

20
Discussion
  • Present some ideas concerning the main points of
    your presentation
  • Provoke questions and comments from your audience
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