OpenMP in a Heterogeneous World

Name: OpenMP in a Heterogeneous World | 8th International Workshop on OpenMP, IWOMP 2012, Rome, Italy, June 11-13, 2012. Proceedings
Brand: Springer
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8th International Workshop on OpenMP, IWOMP 2012, Rome, Italy, June 11-13, 2012. Proceedings

Barbara Chapman Federico Massaioli Matthias S. Müller Marco Rorro(Herausgeber*in)

Springer (Verlag)

Erschienen am 23. Mai 2012

XI, 280 Seiten

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978-3-642-30961-8 (ISBN)

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Inhalt

Title
Preface
Organization
Table of Contents
Eighth International Workshop on OpenMP IWOMP 2012
Proposed Extensions to OpenMP
Specification and Performance Evaluation of Parallel I/O Interfaces for OpenMP
Introduction
Related Work
Interface Specification
Introduction to the Annotation Used
Interface Specification
Implementation in the OpenUH Compiler
Performance Evaluation
Resources
Results
BT I/O
Conclusions
References
The Design of OpenMP Thread Affinity
Introduction
Related Work
Current Implementation-specific Approaches
Machine Model
Places
Place List
Model Specification
Strengths and Limitations of the Machine Model
Affinity
Threads per Place
Affinity Policies
Runtime Library Routines
Use Scenarios and Implementation
Reference Implementation on IBM POWER
Future Enhancements
Summary
References
Auto-scoping for OpenMP Tasks
Introduction
Motivation and Related Work
Proposal
Implementation
Evaluation
Conclusions and Future Work
References
A Case for Including Transactions in OpenMP II: Hardware Transactional Memory
Introduction
Current OpenMP Synchronization Mechanisms
Prior Approaches to Concurrency Control
Mutual Exclusion
Non-blocking Atomic Primitives and OpenMP Atomics
Lock Elision
Integrated TM Language Support
Proposed OpenMP Extension
Blue Gene/Q TM Implementation
Compiler Support
TM Runtime
Experimental Results Using BUSTM
Geometries Used
Experiments in Deterministic Mode
Experiments in Probabilistic Mode
Conclusions, Current and Future Work
References
Extending OpenMP* with Vector Constructs for Modern Multicore SIMD Architectures
Introduction
Related Work
Motivation
SIMD Extensions to OpenMP
Vectorized Worksharing Construct
Vectorization and Parallelization
Additional Vectorization Clauses
Vectorizing Functions
Implementation
Evaluation
Methodology
Benchmarks
Results
Conclusions and Future Work
References
Introducing Task Cancellation to OpenMP
Introduction
Related Work
Task Cancellation in OpenMP
The OpenMP Tasking Model
The Motivation behind Adding Task Cancellation to OpenMP
Adding Cancellable Tasks to OpenMP
Creating Cancellable Tasks
Dealing with Nested Tasks
Cancelling Tasks
Protecting Tasks from Cancellation
When Does Cancellation Take Place?
Evaluation of OpenMP Task Cancellation
Conclusion and Future Work
References
Runtime Environments
Automatic OpenMP Loop Scheduling: A Combined Compiler and Runtime Approach
Introduction
Motivation
Architecture
Compiler Analysis
Compiler Backend
Runtime Monitoring
Loop Scheduling Algorithm
Evaluation
Kernel Experiments
Real-World Applicability
Related Work
Conclusion
References
LIBKOMP, an Efficient OpenMP Runtime System for Both Fork-Join and Data Flow Paradigms
Introduction
The libKOMP Runtime System
The libKOMP Execution Model
Parallel Regions in libKOMP
Data Access Modes for Dependent Tasks
Stack-Based Execution
Work Stealing and Data Flow Dependencies
Discussion
Parallel Loops in libKOMP
Performance Evaluation
Task Management Overhead
Parallel Loops
Barcelona OpenMP Tasks Suite (BOTS)
Data Flow Tasks versus Fork-Join Tasks
Related Work
Conclusion
References
A Compiler-Assisted Runtime-Prefetching Scheme for Heterogeneous Platforms
Introduction
Language Extensions
Compiling Supports
Runtime Use-Def Analysis and Prefetch Scheduling
Adaptive Scheduling
Implementation and Evaluation
Related Work
Conclusion and Future Work
References
Optimization and Accelerators
Experiments with WRF on Intel Many Integrated Core (Intel MIC) Architecture
Introduction
Intel MIC Architecture
Hardware Architecture
System Software Architecture
Software Stack Implementation
OpenMP
MPI
Compiler Offload
WRF Benchmark
WRF Offload
MPI Implementation
Timing Model
Timing Measurement and Results
Conclusions and Future Work
References
Optimizing the Advanced Accelerator Simulation Framework Synergia Using OpenMP
Introduction
Benchmark Application
Platforms
Improving the Performance Using OpenMP
Parallelizing the Loops
Using OpenMP for FFTW
Parallelizing Deposit
Performance Discussion
Related Work
Summary and Conclusions
References
Using Compiler Directives for Accelerating CFD Applications on GPUs
Introduction
GPU Programming
Benchmark Implementations
Baseline Code
Implementations Using ACC Directives
CUDA Implementations
Performance Study
Matrix Transposition
Matrix Multiplication
SP Benchmark
Conclusions
References
Effects of Compiler Optimizations in OpenMP to CUDA Translation
Introduction
Overview of OpenMPC System
Optimization Options
Improving the OpenMPC Tuning System
Modified IE (MIE) Algorithm for OpenMPC
Iterative Elimination
Grouping of Different Optimization Options
MIE Running Strategy
Performance Analysis
Setup
Performance Comparison between Pruned Exhaustive and Modified IE Algorithms
Impact of Individual Optimization Options
Conclusion and Future Work
References
Task Parallelism
Assessing OpenMP Tasking Implementations on NUMA Architectures
Introduction
Related Work
Monitoring Task Execution
Load Balancing vs. Data Locality
Task Overhead
Task Behavior on NUMA Architectures
STREAM
SMXV in a CG Kernel
Application Case Studies
Summary
References
Performance Analysis Techniques for Task-Based OpenMP Applications
Introduction
Related Work
Performance Problems Related to Tasking
The OTF2 Task Event Model
Task Interruption
Evaluation
Conclusion
References
Task-Based Execution of Nested OpenMP Loops
Introduction
Proof of Concept: Re-writing Loop Code Manually
Overcoming Limitations by Automatic Transformation
The OMPi Compiler
Automating the Process
Ordered
Evaluation
Synthetic Benchmark
Face Detection
Conclusion
References
Validation and Benchmarks
SPEC OMP2012 - An Application Benchmark Suite for Parallel Systems Using OpenMP
Introduction
Design and Principles of SPEC OMP2012
General Design
Run Rules
Description of the Benchmark
Energy Efficiency
First Scalability Results
Related Work
Summary and Conclusion
References
An OpenMP 3.1 Validation Testsuite
Introduction
The Design of an OpenMP Validation Suite
Implementation
Directives and Clauses
Support for OpenMP 3.1
Evaluation
Related Work
Conclusion
References
Poster Papers
Performance Analysis of an Hybrid MPI/OpenMP ALM Software for Life Insurance Policies on Multi-core Architectures
Introduction
The ALM Software for Life Insurance Policies
Performance Results
References
Adaptive OpenMP for Large NUMA Nodes
Introduction
Adaptive OpenMP Runtime
Experimental Results
Conclusion and Future Work
References
A Generalized Directive-Based Approach for Accelerating PDE Solvers
Cube-Flu
Parallelization and Directive-Based GPU Porting
Performance Results
References
Design of a Shared-Memory Model for CAPE
Introduction
Shared-Memory Models on Distributed Systems
OpenMP flush Directive and Memory-Consistency Mechanism
Updated Home-Based Lazy Release Consistency Model
The Global Flush Using the UHLRC Model
The Selective Flush Directive Using the UHLRC Model
Conclusion and Future Works
References
Overlapping Computations with Communications and I/O Explicitly Using OpenMP Based Heterogeneous Threading Models
Introduction and Background
Heterogeneous OpenMP Model: BigDFT Implementation
Experiments and Results
Discussion and Proposal for OpenMP Extensions
References
A Microbenchmark Suite for OpenMP Tasks
Introduction
Benchmark Design and Implementation
Benchmark Results
Hardware
Results
Conclusions
References
Support for Thread-Level Speculation into OpenMP
Introduction
Our Proposal
Conclusions
References
Author Index

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