Commit 5c36567c authored by Peter Mitsis's avatar Peter Mitsis Committed by Benjamin Cabé
Browse files

tests: Add benchmark for IPI performance 

Adds tests to better gauge IPI performance on SMP. In each case, one
CPU is used as the source of IPIs while the remaining CPUs are busy
doing "work". Every 30 seconds the benchmark reports on the amount
of "work" done by the busy CPUs and the amount of work done by the
CPU generating the IPIs.

This can be used to ...
 1. Show how enabling IPI optimization affects system performance
 2. Show the cost of spinlock contention as the number of CPUs increase
 3. Measure the relative performance of scheduler changes on SMP.

Signed-off-by: default avatarPeter Mitsis <peter.mitsis@intel.com>
parent 59b62243

tests/benchmarks/ipi_metric/CMakeLists.txt

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# SPDX-License-Identifier: Apache-2.0



cmake_minimum_required(VERSION 3.20.0)

find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})

project(ipi_metric)



#FILE(GLOB app_sources src/*.c)

#target_sources(app PRIVATE ${app_sources})

target_sources_ifdef(

  CONFIG_IPI_METRIC_PREEMPTIVE

  app

  PRIVATE

  src/ipi_metric_preemptive.c

  )

target_sources_ifdef(

  CONFIG_IPI_METRIC_PRIMITIVE_BROADCAST

  app

  PRIVATE

  src/ipi_metric_primitive.c

  )

target_sources_ifdef(

  CONFIG_IPI_METRIC_PRIMITIVE_DIRECTED

  app

  PRIVATE

  src/ipi_metric_primitive.c

  )

tests/benchmarks/ipi_metric/Kconfig

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# Copyright (c) 2024 Intel Corporation

# SPDX-License-Identifier: Apache-2.0



mainmenu "IPI-Metric RTOS Test Suite"



choice IPI_METRIC_TEST

	prompt "Select an IPI-Metric test to execute"

	default IPI_METRIC_PREEMPTIVE

	help

	  The IPI-Metric benchmark suite has a single CPU in an SMP system

	  dedicated to generating IPIs under varying conditions while the

	  remaining CPUs perform their "work" and process IPIs. These tests

	  track the amount of "work" and the number of IPIs processed

	  during 30 second time intervals.



config IPI_METRIC_PREEMPTIVE

	bool "IPIs are generated due threads preempting one another"

	help

	  The CPU generating the IPIs does so as a byproduct of resuming and

	  suspending a series of preemptible threads.



config IPI_METRIC_PRIMITIVE_BROADCAST

	bool "IPIs are generated using primitive arch_sched_broadcast_ipi()"

	help

	  The CPU generating the IPIs does so by directly calling

	  arch_sched_broadcast_ipi() to broadcast them to all CPUs.



config IPI_METRIC_PRIMITIVE_DIRECTED

	bool "IPIs are generated using primitive arch_sched_directed_ipi()"

	depends on ARCH_HAS_DIRECTED_IPIS

	help

	  The CPU generating the IPIs does so by directly calling

	  arch_sched_directed_ipi() to direct them to a single CPU.



endchoice



source "Kconfig.zephyr"

tests/benchmarks/ipi_metric/boards/qemu_cortex_a53_qemu_cortex_a53_smp.conf

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# Copyright (c) 2022 Carlo Caione <ccaione@baylibre.com>

# SPDX-License-Identifier: Apache-2.0



CONFIG_MP_MAX_NUM_CPUS=4

tests/benchmarks/ipi_metric/boards/qemu_cortex_a53_qemu_cortex_a53_smp.overlay

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/* Copyright 2022 Carlo Caione <ccaione@baylibre.com>

 * SPDX-License-Identifier: Apache-2.0

 */



/ {

	cpus {

		cpu@2 {

			device_type = "cpu";

			compatible = "arm,cortex-a53";

			reg = <2>;

		};



		cpu@3 {

			device_type = "cpu";

			compatible = "arm,cortex-a53";

			reg = <3>;

		};

	};

};

tests/benchmarks/ipi_metric/boards/qemu_x86_64.conf

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CONFIG_MP_MAX_NUM_CPUS=4

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