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51 lines
1.9 KiB
CMake
51 lines
1.9 KiB
CMake
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# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
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# SPDX-License-Identifier: Apache-2.0.
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include(CheckSymbolExists)
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# Check if the platform supports setting thread affinity
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# (important for hitting full NIC entitlement on NUMA architectures)
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function(aws_set_thread_affinity_method target)
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# Non-POSIX, Android, and Apple platforms do not support thread affinity.
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if (NOT UNIX OR ANDROID OR APPLE)
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target_compile_definitions(${target} PRIVATE
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-DAWS_AFFINITY_METHOD=AWS_AFFINITY_METHOD_NONE)
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return()
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endif()
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cmake_push_check_state()
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list(APPEND CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
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list(APPEND CMAKE_REQUIRED_LIBRARIES pthread)
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set(headers "pthread.h")
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# BSDs put nonportable pthread declarations in a separate header.
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if(CMAKE_SYSTEM_NAME MATCHES BSD)
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set(headers "${headers};pthread_np.h")
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endif()
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# Using pthread attrs is the preferred method, but is glibc-specific.
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check_symbol_exists(pthread_attr_setaffinity_np "${headers}" USE_PTHREAD_ATTR_SETAFFINITY)
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if (USE_PTHREAD_ATTR_SETAFFINITY)
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target_compile_definitions(${target} PRIVATE
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-DAWS_AFFINITY_METHOD=AWS_AFFINITY_METHOD_PTHREAD_ATTR)
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return()
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endif()
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# This method is still nonportable, but is supported by musl and BSDs.
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check_symbol_exists(pthread_setaffinity_np "${headers}" USE_PTHREAD_SETAFFINITY)
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if (USE_PTHREAD_SETAFFINITY)
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target_compile_definitions(${target} PRIVATE
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-DAWS_AFFINITY_METHOD=AWS_AFFINITY_METHOD_PTHREAD)
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return()
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endif()
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# If we got here, we expected thread affinity support but didn't find it.
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# We still build with degraded NUMA performance, but show a warning.
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message(WARNING "No supported method for setting thread affinity")
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target_compile_definitions(${target} PRIVATE
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-DAWS_AFFINITY_METHOD=AWS_AFFINITY_METHOD_NONE)
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cmake_pop_check_state()
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endfunction()
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