add compile time option for matrix output

The parameter `-DABY_ENABLE_MATRIX=On` to cmake now enables output for
the MATRIX framework.  Also, the `write_log` method is not called
automatically anymore after the last task.

CMakeLists.txt

@@ -2,6 +2,7 @@ cmake_minimum_required(VERSION 3.10)
 project(ABY LANGUAGES CXX)
 
 option(ABY_BUILD_EXE "Build executables" OFF)
+option(ABY_ENABLE_MATRIX "Enable logging for the MATRIX framework in examples applications" OFF)
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake")
 

README.md

@@ -122,6 +122,9 @@ applications, you use the `ABY_BUILD_EXE` option:
 cmake .. -DABY_BUILD_EXE=On
 ```
 
+If also `-DABY_ENABLE_MATRIX=On` is given, then the examples output data for
+the [MATRIX framework](https://github.com/cryptobiu/MATRIX) (if available).
+
 ###### Build Options
 
 You can choose the build type, e.g. `Release` or `Debug` using

src/abycore/MATRIX/MatrixMeasurement.h

@@ -75,12 +75,6 @@ class MatrixMeasurement
     {
         auto taskIdx = getTaskIdx(taskName);
         m_cpuEndTimes[taskIdx][currentIterationNumber] = get_ms_since_epoch();
-
-        // if this is the last task and last iteration write the data to file
-        if (taskIdx == m_tasksNames.size() - 1 && currentIterationNumber == m_cpuEndTimes[0].size() - 1)
-        {
-            write_log();
-        }
     }
 
     void write_log() const

src/examples/innerproduct/CMakeLists.txt

@@ -1,3 +1,6 @@
 
 add_executable(innerproduct_test innerproduct_test.cpp common/innerproduct.cpp)
 target_link_libraries(innerproduct_test ABY::aby ENCRYPTO_utils::encrypto_utils)
+if(ABY_ENABLE_MATRIX)
+    target_compile_definitions(innerproduct_test PRIVATE ABY_ENABLE_MATRIX)
+endif()

src/examples/innerproduct/common/innerproduct.cpp

@@ -128,6 +128,10 @@ int32_t test_inner_product_circuit(e_role role, const std::string& address, uint
 	party->ExecCircuit();
     log.endSubTask("ExecCircuit", 0);
 
+#ifdef ABY_ENABLE_MATRIX
+	log.write_log();
+#endif
+
 	/**
 	 Step 10: Type caste the plaintext output to 16 bit unsigned integer.
 	 */