Enhance the CachingMemoryManager to possibly handle high memory press…

…ure (#188)

Summary:
Enhance the CachingMemoryManager to handle high memory pressure by adding 2 options.
Note: the default behavior is unchanged.
Add a new API to MemoryManagerAdapter to setOption().
Side: remove some glog includes failing compilation if glog-dev not installed locally

**Original Issue**:
flashlight/flashlight#180
closes flashlight/flashlight#180

The CachingMemoryManager being greedy in memory. This PR adds 2 options to mitigate this.

### Test Plan (required)
Implemented a new unitest in order to show OOM with the default CachingMM and no OOM if the right option is set.

Pull Request resolved: flashlight/flashlight#188

Reviewed By: vineelpratap

Differential Revision: D24435873

Pulled By: jacobkahn

fbshipit-source-id: 99186439c1e306ad987079cc326ab68fe1f028fc

app/asr/CMakeLists.txt

@@ -87,9 +87,9 @@ add_executable(Train ${CMAKE_CURRENT_LIST_DIR}/Train.cpp)
 add_executable(Test ${CMAKE_CURRENT_LIST_DIR}/Test.cpp)
 add_executable(Decoder ${CMAKE_CURRENT_LIST_DIR}/Decode.cpp)
 
-target_link_libraries(Train flashlight-app-asr)
-target_link_libraries(Test flashlight-app-asr)
-target_link_libraries(Decoder flashlight-app-asr)
+target_link_libraries(Train flashlight-app-asr ${CMAKE_DL_LIBS})
+target_link_libraries(Test flashlight-app-asr ${CMAKE_DL_LIBS})
+target_link_libraries(Decoder flashlight-app-asr ${CMAKE_DL_LIBS})
 
 # --------------------------- Tests ---------------------------
 

ext/test/CMakeLists.txt

@@ -3,11 +3,13 @@ cmake_minimum_required(VERSION 3.5.1)
 set(DIR ${CMAKE_CURRENT_LIST_DIR})
 set(LIBS flashlight)
 
-build_test(
-  ${DIR}/common/SequentialBuilderTest.cpp
-  ${LIBS}
-  "ARCHDIR=\"${DIR}/common/\""
+if(FL_BUILD_CONTRIB)
+  build_test(
+    ${DIR}/common/SequentialBuilderTest.cpp
+    ${LIBS}
+    "ARCHDIR=\"${DIR}/common/\""
   )
+endif()
 
 add_library(test_module_plugin MODULE
   ${DIR}/common/test_module_plugin.cpp)