C++ - Parallel and Heterogeneous Computing with Microsoft PPL & AMP

Computationally intensive work is often best solved by moving to parallel processing, to take advantage of multiple cores. In addition many developers are starting to look towards using different types of hardware to optimize their software further.

Today many C++ programmers are looking to the Microsoft PPL (Parallel Patterns Library) and Microsoft AMP (Accelerated Massive Parallelism) to help them write parallel algorithms to run on both the CPU and GPU. Microsoft PPL is designed to help developers quickly get their code running on multiple cores, while the AMP libraries are intended to remove much of the complexity of heterogeneous computing (particularly around mixing hardware from different manufacturers). This course investigates both PPL and AMP, however it has a larger focus on the more advanced AMP functionality.

You’ll come out of “Parallel and Heterogeneous Computing” knowing the following: * How to avoid common optimization pitfalls. * When to benefit from parallelism. * How the underlying hardware contributes to parallelism. * How to take advantage of multiple cores with C++ and Microsoft PPL. * How to take advantage of the GPU across multiple manufacturers with C++ and Microsoft AMP. * How to avoid common parallel and heterogeneous computing pitfalls. * How to debug and dig into parallel and heterogeneous programs.

Förkunskaper

Good C++ knowledge and experience. Knowledge of multi-threaded programming using threads.

Ämnesområden

Introduction to Parallelism

C++11 Refresher

  • Move semantics
  • Deleted/Defaulted Functions
  • Lambdas

Measuring Performance

  • Types of performance
  • Taking good benchmarks
  • Accounting for error

Hardware

CPU Internals

Instruction level parallelism

  • Understanding Limitations
  • Caching (NUMA)
  • Cost of shared writes
  • Common Pitfalls

Floating Point Numbers

  • + 0.2 != 0.3
  • Limitations of floating point
  • Compiler optimizations with floating point
  • Parallel processing and accuracy

Identifying algorithms that are parallelizable

  • CPU bound Vs. IO bound
  • Re-writing for better parallelization.
  • Amdahl’s Law

Parallel patterns and algorithms

  • Map
  • Reduce
  • Scan
  • Pack
  • Command queues
  • Combined examples

Introduction to PPL

  • Why tasks instead of threads?
  • Runtime support
  • Primitives
  • parallel_for
  • non-determinism

Synchronization in PPL

  • critical_section
  • readerwriterlock
  • scopedlock/scopedread
  • event
  • costs of synchronization
  • alternatives

Visual Studio Debug Tools for Concurrency

  • Concurrency Visualizer
  • Parallel Stacks
  • Parallel Tasks
  • Parallel Watch
  • Identifying anti-patterns
  • Debugging PPL Algorithms
  • Event Tracing

Exception Handling

  • Catching task::get/task::wait
  • Exceptions inside parallel_for vs for loops

Similar Technologies to PPL

  • pthread
  • Intel TBB
  • Boost

Introduction to Vector programming

  • What is SIMD
  • Masking and execution coherence
    - Memory Layout
    - Structure of Array
  • Array of Structs
  • Auto vectorization

Introduction to the GPU Hardware

  • Hardware
  • Memory Types and Caching
  • Cores, Threads, Tiles and Warps
  • PCIe Bus

Methods of writing code for the GPU

  • OpenCL
  • CUDA
  • DirectCompute
  • Microsoft C++ AMP

Introduction to AMP

  • AMP Syntax and Data Types
  • array, array_view
  • index
  • extent
  • grid
  • restrict

parallelforeach

  • How to use
  • Optimizing Memory Move/Copy

Synchronizing memory with accelerators

  • Implicit synchronization
  • synchronize*()
  • data()
  • Lost Exceptions

Concurrency::fastmath and precisemath

  • What’s inside
  • Comparison to “standard” math.
  • Precision
  • Accelerator requirements
  • Example

Debugging with Warp

  • Visual Studio Tools
  • GPU Threads
  • Parallel Stacks
  • Parallel Watch

Floating Point Numbers

  • How they are handled
  • Why they are different from CPU
  • Performance of float/double operations

Tiling

  • Syntax
  • Determining tile size
  • Memory Coalescence
  • Memory Collisions
  • Tile Synchronization

AMP Atomic Operations

  • atomic_exchange()
  • atomic_fetch*()

Parallel patterns with AMP

  • Map
  • Reduce
  • Scan
  • Pack

AMP Accelerators

  • Accelerator properties
  • Shared memory
  • Using multiple accelerators

Concurrency::graphics

  • Exploiting the texture cache.

AMP Error Handling

  • Exceptions
  • Detecting/Recovering from TDR

 

Om kursen

Pris: 25 970,00 kr

exklusive moms

Längd 3 dagar
Kurskod ET391

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