authors: Kunal Pai, Harshil Patel
last edited: 2024-07-09 22:50:19 +0000

Introduction

Suite is a new category of resource introduced in gem5 version 23.1, which allows users to group workloads. SuiteResource class is added to the resource specialization. Pre-made suites on the gem5 resources can be obtained using obtain_resource() like all other resources.

SuiteResource class has __iter__ and __len__ functions. A SuiteResource will behave as an iterator that returns a generator of the workload objects.

How to Get a Suite

To get a suite already in gem5 resources, we can use the obtain_resource function present in the [resource.py](http://resource.py).

To get a suite with ID “riscv-vertical-microbenchmarks” and version “1.0.0”

suite_obj = obtain_resource(id = "riscv-vertical-microbenchmarks", resource_version="1.0.0")

Not specifying the resource_version will return the latest compatible version of the resource.

NOTE: The Suite used for the rest of the tutorial is the “riscv-vertical-microbenchmarks”, which exists in gem5 resources, but is only compatible with gem5 version 23.1 and above and with the RISC-V ISA.

How to Filter a Workload in the Suite by Input Groups

Each suite had a workloads field which is an array containing the ID, version, and input groups of all the workloads in the suite.

The workload field would look like the following:

[
	{
		'id': 'riscv-cca-run',
		'resource_version': '1.0.0',
		'input_group': ['cca']
	},
	{
		'id': 'riscv-cce-run',
		'resource_version': '1.0.0',
		'input_group': ['cce']
	},
	{
		'id': 'riscv-ccm-run',
		'resource_version': '1.0.0',
		'input_group': ['ccm']
	},
	...
]

The SuiteResource class has functions that allow users to filter workloads by input groups. The function get_input_groups() returns a set of all the input groups present in the suite. The function with_input_group(str) returns a SuiteResource object which only has the workloads with the input group passed in as a parameter. For example, our suite has the workloads field as defined above then, get_input_groups() will return the following:

set(['cca','cce','ccm',...])

We can use the with_input_group() like this:

suite_obj = obtain_resource('riscv-vertical-microbenchmarks')
filtered_suite = suite_obj.with_input_group('cca')

This will return a SuiteResource with all the workloads that fulfill the case of having input group “cca”, which in this case is the WorkloadResource with ID “riscv-cca-run”.

We can also use the with_input_group() function along with a for loop and a generator.

for workload in suite_obj.with_input_group('cca')
	board.set_workload(workload)
	simulator = Simulator(board=board)
	simulator.run()

Make a Custom Suite

Custom suites can also be made by directly using the SuiteResource class from [resource.py](http://resource.py). To create a custom suite we will also need WorkloadResource objects.

workload1= obtain_resource('workload-1', resource_version='1.0.0')
workload2= obtain_resource('workload-2', resource_version='1.0.0')

suite_obj = SuiteResource(workloads=[workload1, workload2])

The above code snippet will create a suite object with two workloads. We have not defined the workloads field in the above suite so the get_input_group() and with_input_group() functions will throw a warning and return an empty set and a suite object with no workloads respectively.

If the workloads field is added then the custom suite will function the same as a suite created by using obtain_resource.

workload1= obtain_resource('workload-1', resource_version='1.0.0')
workload2= obtain_resource('workload-2', resource_version='1.0.0')
workloads = [
	{
		'id': 'workload-1',
		'resource_version': '1.0.0',
		'input_group': ['input_group_1', 'input_group_2']
	},
	{
		'id': 'workload-2',
		'resource_version': '1.0.0',
		'input_group': ['input_group_1', 'input_group_3']
	}]
suite_obj = SuiteResource(workloads=[workload1, workload2], worklaods= workloads)