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SYCL Academy

Exercise 13: Load Balancing

In this exercise you will learn how to create two separate queues and then split a task across two devices.

1.) Get two devices

Get two devices. If only host device is available then both devices may be identical, that is the host device.

2.) Create queues

Then create a queue for each of the two devices.

3. ) Split a task across the two queues

Using either the application from exercise 6 using the buffer/accessor model or the application from exercise 8 with the USM model create an application where the work is distributed across two devices using the two queues you created.

Remember to create separate buffers for the separate parts of the data being computed.

Remember to wait on the work enqueued to bothqueues to complete and remember to handle errors.

Also note that you will need to have different types defined to name each of the two kernel kernel functions.

4. ) Tweak the load balancing

Try playing around with the distribution of the work between the two devices by changing the range and offset of the two buffers.

Build and execution hints

For DPC++: Using CMake to configure then build the exercise:

mkdir build
cd build
cmake .. "-GUnix Makefiles" -DSYCL_ACADEMY_USE_DPCPP=ON -DSYCL_ACADEMY_ENABLE_SOLUTIONS=OFF -DCMAKE_C_COMPILER=icx -DCMAKE_CXX_COMPILER=icpx
make exercise_13

Alternatively from a terminal at the command line:

icpx -fsycl -o sycl-ex-13 -I../External/Catch2/single_include ../Code_Exercises/Exercise_13_Load_Balancing/source.cpp
./sycl-ex-13

For AdaptiveCpp:

# <target specification> is a list of backends and devices to target, for example
# "omp;generic" compiles for CPUs with the OpenMP backend and GPUs using the generic single-pass compiler.
# The simplest target specification is "omp" which compiles for CPUs using the OpenMP backend.
cmake -DSYCL_ACADEMY_USE_ADAPTIVECPP=ON -DSYCL_ACADEMY_INSTALL_ROOT=/insert/path/to/adaptivecpp -DACPP_TARGETS="<target specification>" ..
make exercise_13

alternatively, without CMake:

cd Code_Exercises/Exercise_13_Load_Balancing
/path/to/adaptivecpp/bin/acpp -o sycl-ex-13 -I../../External/Catch2/single_include --acpp-targets="<target specification>" source.cpp
./sycl-ex-13