Add executorch parallel

Summary: Adds parallel backend for ExecuTorch and changes the ExecuTorch op libary to a static one.

Reviewed By: digantdesai

Differential Revision: D62711909

Author: metascroy

torchao/experimental/CMakeLists.txt

@@ -24,11 +24,15 @@ if(NOT TORCHAO_INCLUDE_DIRS)
   set(TORCHAO_INCLUDE_DIRS ${TORCHAO_ROOT}/../..)
 endif()
 
+if (NOT TORCHAO_OP_TARGET)
+    message(FATAL_ERROR "TORCHAO_OP_TARGET is not set.  Set it to ATEN or EXECUTORCH.")
+endif()
+
 if (NOT TORCHAO_PARALLEL_BACKEND)
     if (TORCHAO_OP_TARGET STREQUAL "ATEN")
         set(TORCHAO_PARALLEL_BACKEND "ATEN_OPENMP")
     elseif(TORCHAO_OP_TARGET STREQUAL "EXECUTORCH")
-        set(TORCHAO_PARALLEL_BACKEND "PTHREADPOOL")
+        set(TORCHAO_PARALLEL_BACKEND "EXECUTORCH")
     else()
         message(TORCHAO_PARALLEL_BACKEND "TORCHAO_PARALLEL_BACKEND is not set.  Please set it directly or set TORCHAO_OP_TARGET to get a default.")
     endif()

torchao/experimental/Utils.cmake

@@ -23,6 +23,14 @@ function(target_link_torchao_parallel_backend target_name torchao_parallel_backe
         target_compile_definitions(${target_name} PRIVATE TORCHAO_PARALLEL_ATEN=1 AT_PARALLEL_OPENMP=1 INTRA_OP_PARALLEL=1)
         target_link_libraries(${target_name} PRIVATE ${TORCH_INSTALL_PREFIX}/lib/libomp${CMAKE_SHARED_LIBRARY_SUFFIX})
 
+    elseif(TORCHAO_PARALLEL_BACKEND_TOUPPER STREQUAL "EXECUTORCH")
+    message(STATUS "Building with TORCHAO_PARALLEL_BACKEND=TORCHAO_PARALLEL_EXECUTORCH")
+    message(STATUS "EXECUTORCH_INCLUDE_DIRS: ${EXECUTORCH_INCLUDE_DIRS}")
+    message(STATUS "EXECUTORCH_LIBRARIES: ${EXECUTORCH_LIBRARIES}")
+    target_include_directories(${target_name} PRIVATE "${EXECUTORCH_INCLUDE_DIRS}")
+    target_link_libraries(${target_name} PRIVATE "${EXECUTORCH_LIBRARIES}")
+    target_compile_definitions(${target_name} PRIVATE TORCHAO_PARALLEL_EXECUTORCH=1)
+
     elseif(TORCHAO_PARALLEL_BACKEND_TOUPPER STREQUAL "OPENMP")
         message(STATUS "Building with TORCHAO_PARALLEL_BACKEND=OPENMP.  You must set the CMake variable OpenMP_ROOT to the OMP library location before compiling.  Do not use this option if Torch was built with OPENMP; use ATEN_OPENMP instead.")
         find_package(OpenMP REQUIRED)

torchao/experimental/build_torchao_ops.sh

@@ -11,8 +11,8 @@ export CMAKE_OUT=/tmp/cmake-out/torchao
 cmake -DCMAKE_PREFIX_PATH=${CMAKE_PREFIX_PATH} \
     -DCMAKE_INSTALL_PREFIX=${CMAKE_OUT} \
     -DTORCHAO_OP_TARGET="$1" \
-    -DEXECUTORCH_LIBRARIES=${EXECUTORCH_LIBRARIES} \
-    -DEXECUTORCH_INCLUDE_DIRS=${EXECUTORCH_INCLUDE_DIRS} \
+    -DEXECUTORCH_LIBRARIES="${EXECUTORCH_LIBRARIES}" \
+    -DEXECUTORCH_INCLUDE_DIRS="${EXECUTORCH_INCLUDE_DIRS}" \
     -S . \
     -B ${CMAKE_OUT}
 cmake --build  ${CMAKE_OUT} --target install --config Release

torchao/experimental/kernels/cpu/aarch64/CMakeLists.txt

@@ -13,3 +13,8 @@ if (CMAKE_SYSTEM_PROCESSOR STREQUAL "arm64")
     ${TORCHAO_INCLUDE_DIRS}/torchao/experimental/kernels/cpu/aarch64/valpacking/interleave.cpp
   )
 endif()
+
+install(
+  TARGETS torchao_kernels_aarch64
+  DESTINATION lib
+)

torchao/experimental/ops/linear/CMakeLists.txt

@@ -10,3 +10,8 @@ include(${TORCHAO_ROOT}/Utils.cmake)
 
 add_library(torchao_ops_linear_${TORCHAO_PARALLEL_BACKEND} STATIC channelwise_8bit_activation_groupwise_lowbit_weight.cpp)
 target_link_torchao_parallel_backend(torchao_ops_linear_${TORCHAO_PARALLEL_BACKEND} "${TORCHAO_PARALLEL_BACKEND}")
+
+install(
+  TARGETS torchao_ops_linear_${TORCHAO_PARALLEL_BACKEND}
+  DESTINATION lib
+)

torchao/experimental/ops/linear/channelwise_8bit_activation_groupwise_lowbit_weight.cpp

@@ -93,7 +93,7 @@ LinearTilingParams get_default_linear_tiling_params(
 
   LinearTilingParams tiling_params;
   auto num_threads = torchao::get_num_threads();
-  assert(num_threads >= 1);
+  TORCHAO_CHECK(num_threads >= 1, "num_threads must be >= 1");
 
   tiling_params.mc_by_mr = 1;
   int mc = tiling_params.mc_by_mr * ukernel_config.mr;

torchao/experimental/ops/linear/linear_a8wxdq_op/CMakeLists.txt

@@ -19,7 +19,7 @@ if(TORCHAO_OP_TARGET STREQUAL "ATEN")
     target_compile_definitions(linear_a8wxdq_${TORCHAO_OP_TARGET} PRIVATE USE_ATEN=1)
 elseif(TORCHAO_OP_TARGET STREQUAL "EXECUTORCH")
     message(STATUS "Building with TORCHAO_OP_TARGET=EXECUTORCH")
-    add_library(linear_a8wxdq_${TORCHAO_OP_TARGET} SHARED
+    add_library(linear_a8wxdq_${TORCHAO_OP_TARGET} STATIC
         linear_a8wxdq_executorch/w2s.cpp
         linear_a8wxdq_executorch/w2sz.cpp
         linear_a8wxdq_executorch/w3s.cpp
@@ -29,9 +29,9 @@ elseif(TORCHAO_OP_TARGET STREQUAL "EXECUTORCH")
         linear_a8wxdq_executorch/w5s.cpp
         linear_a8wxdq_executorch/w5sz.cpp
     )
-    target_include_directories(linear_a8wxdq_${TORCHAO_OP_TARGET} PRIVATE ${EXECUTORCH_INCLUDE_DIRS})
+    target_include_directories(linear_a8wxdq_${TORCHAO_OP_TARGET} PRIVATE "${EXECUTORCH_INCLUDE_DIRS}")
     target_compile_definitions(linear_a8wxdq_${TORCHAO_OP_TARGET} PRIVATE USE_EXECUTORCH=1)
-    target_link_libraries(linear_a8wxdq_${TORCHAO_OP_TARGET} PRIVATE ${EXECUTORCH_LIBRARIES})
+    target_link_libraries(linear_a8wxdq_${TORCHAO_OP_TARGET} PRIVATE "${EXECUTORCH_LIBRARIES}")
     target_link_libraries(linear_a8wxdq_${TORCHAO_OP_TARGET} PRIVATE torchao_kernels_aarch64)
     target_link_libraries(linear_a8wxdq_${TORCHAO_OP_TARGET} PRIVATE torchao_ops_linear_${TORCHAO_PARALLEL_BACKEND})
 else()

torchao/experimental/ops/parallel-executorch-impl.h

@@ -0,0 +1,28 @@
+// Copyright (c) Meta Platforms, Inc. and affiliates.
+// All rights reserved.
+//
+// This source code is licensed under the license found in the
+// LICENSE file in the root directory of this source tree.
+
+#pragma once
+
+#include <executorch/extension/threadpool/threadpool.h>
+
+template <typename F>
+void torchao::parallel_1d(const int64_t begin, const int64_t end, const F& f) {
+  torch::executorch::threadpool::get_threadpool()->run(
+      [&](size_t i) {
+        int64_t idx = begin + i;
+        f(idx);
+      },
+      end - begin);
+}
+
+inline void torchao::set_num_threads(int num_threads) {
+  torch::executorch::threadpool::get_threadpool()->_unsafe_reset_threadpool(
+      num_threads);
+}
+
+inline int torchao::get_num_threads() {
+  return torch::executorch::threadpool::get_threadpool()->get_thread_count();
+}

torchao/experimental/ops/parallel.h

@@ -34,8 +34,7 @@ int get_num_threads();
 #ifdef TORCHAO_PARALLEL_EXECUTORCH
 #pragma message( \
     "TORCHAO_PARALLEL_EXECUTORCH is set.  Using ExecuTorch parallel backend.")
-
-#error "TORCHAO_PARALLEL_EXECUTORCH is not implemented yet"
+#include <torchao/experimental/ops/parallel-executorch-impl.h>
 
 #else
 #ifdef TORCHAO_PARALLEL_PTHREADPOOL