Replace Legion with Realm in CMake, remove prebuilt binaries, remove ucx dependency.

Author: elliottslaughter

CMakeLists.txt

@@ -33,22 +33,15 @@ set(FF_MAX_NUM_TASK_REGIONS "20" CACHE STRING
 set(FF_MAX_NUM_TASK_ARGUMENTS "5" CACHE STRING
   "Maximum number of arguments that can be declared in a TaskSignature")
 option(FF_USE_NCCL "Run FlexFlow with NCCL" OFF)
-option(FF_USE_PREBUILT_LEGION "Enable use of Legion pre-compiled library, if available" ON)
 option(FF_USE_ALL_PREBUILT_LIBRARIES "Enable use of all pre-compiled libraries, if available" OFF)
 option(FF_USE_PYTHON "Enable Python" ON)
 option(FF_BUILD_FROM_PYPI "Build from pypi" OFF)
 option(FF_USE_CODE_COVERAGE "Enable code coverage" OFF)
 
-set(FF_GASNET_CONDUITS aries udp mpi ibv ucx)
-set(FF_GASNET_CONDUIT "mpi" CACHE STRING "Select GASNet conduit ${FF_GASNET_CONDUITS}")
-set_property(CACHE FF_GASNET_CONDUIT PROPERTY STRINGS ${FF_GASNET_CONDUITS})
-set(FF_LEGION_NETWORKS "" CACHE STRING "Network backend(s) to use")
-
 set(FF_GPU_BACKENDS cuda hip_cuda hip_rocm intel)
 set(FF_GPU_BACKEND "cuda" CACHE STRING "Select GPU Backend ${FF_GPU_BACKENDS}")
 set_property(CACHE FF_GPU_BACKEND PROPERTY STRINGS ${FF_GPU_BACKENDS})
 
-option(FF_USE_EXTERNAL_LEGION "Use pre-installed Legion" OFF)
 option(FF_USE_EXTERNAL_NCCL "Use pre-installed NCCL" OFF)
 option(FF_USE_EXTERNAL_JSON "Use pre-installed nlohmann::json" OFF)
 option(FF_USE_EXTERNAL_FMT "Use pre-installed fmt" OFF)
@@ -104,7 +97,7 @@ include(gbenchmark)
 include(libassert)
 include(CTest)
 include(fmt)
-include(legion)
+include(realm)
 include(rapidcheck)
 #include(gtest)
 

cmake/legion.cmake

@@ -0,0 +1 @@
+find_package(Realm REQUIRED)