Multiple Compute Units

This is simple Example of Multiple Compute units to showcase how a single kernel can be instantiated into Multiple compute units. Host code will show how to use multiple compute units and run them concurrently.

KEY CONCEPTS: Multiple Compute Units

KEYWORDS: nk

This example explains how to create multiple instances of a kernel and execute them concurrently.

For the same kernel to be instantiated into multiple compute units, nk flag is used to specify the number of compute units in a .cfg config file as shown below:

[connectivity]
nk=vadd:4

For kernels to execute concurrently, command queue is initialized with out of order execution mode enabled.

```c++ OCL_CHECK(err, q = cl::CommandQueue(context, device, CL_QUEUE_PROFILING_ENABLE | CL_QUEUE_OUT_OF_ORDER_EXEC_MODE_ENABLE, &err));

EXCLUDED PLATFORMS:

• All NoDMA Platforms, i.e u50 nodma etc

• xilinx_zcu102_base_dfx

DESIGN FILES

Application code is located in the src directory. Accelerator binary files will be compiled to the xclbin directory. The xclbin directory is required by the Makefile and its contents will be filled during compilation. A listing of all the files in this example is shown below

src/host.cpp
src/vadd.cpp

Access these files in the github repo by clicking here.

COMMAND LINE ARGUMENTS

Once the environment has been configured, the application can be executed by

./mult_compute_units <vadd XCLBIN>