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ac6 >> ac6-training >> Online Training >> Languages >> Parallel programming with OpenCL

oL9 Parallel programming with OpenCL

Parallel programming with OpenCL-1.2

Objectives

Learn parallel programming with OpenCL.
Know what (not) to expect from parallel programming.
Understand heavy multithreading and how it is mapped to the hardware.
Measure OpenCL code performance, locate and solve bottlenecks.
Write efficient OpenCL code.

Exercises will be run on multi-core CPUs with nVidia GPU running under Linux.

Pre-requisites

Good knowledge of the C language

Course Environment

Theoretical course

PDF course material (in English).
Course dispensed using the Teams video-conferencing system.
The trainer answers trainees' questions during the training and provide technical and pedagogical assistance through the Teams video-conferencing system.

Practical activities

Practical activities represent from 40% to 50% of course duration.
Code examples, exercises and solutions
One Online Linux PC per trainee for the practical activities.
The trainer has access to trainees' Online PCs for technical and pedagogical assistance.
Eclipse environment and GCC compiler.
QEMU Emulated board or physical board connected to the online PC (depending on the course).
Some Labs may be completed between sessions and are checked by the trainer on the next session.

Downloadable preconfigured virtual machine for post-course practical activities
At the start of each session the trainer will interact with the trainees to ensure the course fits their expectations and correct if needed

Duration

Total: 24 hours
4 sessions, 6 hours each (excluding break time)
From 40% to 50% of training time is devoted to practical activities
Some Labs may be completed between sessions and are checked by the trainer on the next session

Target Audience

Any embedded systems engineer or technician with the above prerequisites.

Evaluation modalities

The prerequisites indicated above are assessed before the training by the technical supervision of the traineein his company, or by the trainee himself in the exceptional case of an individual trainee.
Trainee progress is assessed in two different ways, depending on the course:

For courses lending themselves to practical exercises, the results of the exercises are checked by the trainer while, if necessary, helping trainees to carry them out by providing additional details.
Quizzes are offered at the end of sections that do not include practical exercises to verifythat the trainees have assimilated the points presented

At the end of the training, each trainee receives a certificate attesting that they have successfully completed the course.

In the event of a problem, discovered during the course, due to a lack of prerequisites by the trainee a different or additional training is offered to them, generally to reinforce their prerequisites,in agreement with their company manager if applicable.

First Session

Introduction to OpenCL

History

OpenCL 1.0
OpenCL 1.1
OpenCL 1.2
OpenCP/EP (Embedded Profile)

Design goals of OpenCL

CPUs, GPUs and GPGPUs
Data-parallel and Task-parallel
Hardware related and portable

Terminology

Host / Device
Memory model
Execution Model

The OpenCL Architecture

The OpenCL Architecture

Platform Model
Execution Model
Memory Model
Programming Model

The OpenCL Software Stack
Example

Exercise:

Installation and test of the OpenCL SDK

Second Session

The OpenCL Host API

Platform layer

Querying and selecting devices
Managing compute devices
Managing computing contexts and queues
The host objects: program, kernel, buffer, image

Exercise:

Write a platform discovery and analysis program (displaying CPUs, GPUs, versions...)

Runtime

Managing resources
Managing memory domains
Executing compute kernels

Exercise:

Write an image loader program, transferring image to/from compute devices

Compiler

The OpenCL C programming language
Online compilation
Offline compilation

The Basic OpenCL Execution Model

How code is executed on hardware

Compute kernel
Compute program
Application queues

OpenCL Data-parallel execution

N-dimensional computation domains
Work-items and work-groups
Synchronization and communication in a work-group
Mapping global work size to work-groups
Parallel execution of work-groups

Exercise:

Compile and execute a program to square an array on the platform computing nodes

Third Session

The OpenCL Programming Language

Restrictions from C99
Data types

Scalar
Vector
Structs and pointers
Type-conversion functions
Image types

Exercise:

Rewrite the square program to use vector operations

Required built-in functions

Work-item functions
Math and relational
Input/output
Geometric functions
Synchronization

Optional features

Atomics
Rounding modes

Exercise:

Write and execute an image manipulation program (Blur filter)

Fourth Session

Advanced OpenCL Execution modes

Profiling

Exercise:

Enhance the image manipulation program to measure kernel computation time

The OpenCL Memory Model

Global Memory
Local Memory
Private Memory

OpenCL Task-parallel execution

Optional OpenCL feature
Native work-items

Exercise:

Simulate the N-Body problem, displaying data using OpenGL

Efficient OpenCL

When (not) to use OpenCL
Code design guidelines
Explicit vectorization

Exercise:

Explore vectorisation on an image rotation kernel

Memory latency and access patterns

ALU latency
Using local memory

Exercise:

Enhance the Blur filter program to investigate memory optimisations

Synchronizing threads
Warps/Wavefronts, work groups, and GPU cores

This course was designed specifically to be provided online, by one of our skilled trainers.

Scheduled classes are confirmed as soon as there is two confirmed bookings. Bookings are accepted until 2 working days before the course start.

A version tailored for face-to-face delivery is available under reference L9 - OpenCL

To book a training session or for more information, please contact us on info@ac6-training.com.

Registrations are accepted till one week before the start date for scheduled classes. For late registrations, please consult us.

You can also fill and send us the registration form

Last update of course schedule: 24 June 2021

Booking one of our trainings is subject to our General Terms of Sales

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