Make function tracing optional.

1. Disable function tracing by default.
2. Store the cmake option in dftracer_config.h
3. Compile out ftracing when disabled.
4. Add documentations.

CMakeLists.txt

@@ -112,6 +112,15 @@ if (NOT DFTRACER_DISABLE_HWLOC)
     set(DFTRACER_HWLOC_ENABLE 1)
 endif()
 
+# Options
+option (DFTRACER_ENABLE_FTRACING "Enable Function Tracing" OFF)
+if (DFTRACER_ENABLE_FTRACING) 
+    set(DFTRACER_FTRACING_ENABLE 1)
+    set(DFTRACER_FUNCTION_FLAGS "-g" "-finstrument-functions" "-Wl,-E" "-fvisibility=default")
+else()
+    set(DFTRACER_FUNCTION_FLAGS )
+endif()
+
 option (DFTRACER_ENABLE_MPI "Enable MPI" On)
 if (DFTRACER_ENABLE_MPI) 
     set(DFTRACER_MPI_ENABLE 1)
@@ -584,6 +593,8 @@ string(APPEND _str
 append_str_tf(_str
   DFTRACER_GNU_LINUX
   DFTRACER_LIBDIR_AS_LIB
+  DFTRACER_ENABLE_FTRACING
+  DFTRACER_ENABLE_MPI
   DFTRACER_USE_CLANG_LIBCXX
   DFTRACER_WARNINGS_AS_ERRORS
   DFTRACER_BUILD_PYTHON_BINDINGS

cmake/configure_files/dftracer-config.cmake.build.in

@@ -86,8 +86,12 @@ if (DFTRACER_INCLUDE_MPI)
         message(FATAL_ERROR "-- [DFTRACER] mpi is needed for ${PROJECT_NAME} build")
     endif ()
 endif()
-
+set(DFTRACER_ENABLE_FTRACING @DFTRACER_ENABLE_FTRACING@)
+if (DFTRACER_ENABLE_FTRACING)
 set(DFTRACER_FUNCTION_FLAGS "-g" "-finstrument-functions" "-Wl,-E" "-fvisibility=default")
+else()
+set(DFTRACER_FUNCTION_FLAGS )
+endif()
 check_required_components(dftracer)
 
 set(DFTRACER_LIBRARIES dftracer)

cmake/configure_files/dftracer-config.cmake.install.in

@@ -85,8 +85,12 @@ if (DFTRACER_INCLUDE_MPI)
         message(FATAL_ERROR "-- [DFTRACER] mpi is needed for ${PROJECT_NAME} build")
     endif ()
 endif()
+set(DFTRACER_ENABLE_FTRACING @DFTRACER_ENABLE_FTRACING@)
+if (DFTRACER_ENABLE_FTRACING)
 set(DFTRACER_FUNCTION_FLAGS "-g" "-finstrument-functions" "-Wl,-E" "-fvisibility=default")
-
+else()
+set(DFTRACER_FUNCTION_FLAGS )
+endif()
 check_required_components(dftracer)
 
 set(DFTRACER_LIBRARIES dftracer)

cmake/configure_files/dftracer_config.hpp.in

@@ -31,6 +31,7 @@
 /* Macro flags */
 #cmakedefine DFTRACER_GNU_LINUX 1
 #cmakedefine DFTRACER_MPI_ENABLE 1
+#cmakedefine DFTRACER_FTRACING_ENABLE 1
 
 //==========================
 // Common macro definitions

docs/api.rst

@@ -68,9 +68,9 @@ ENV Variables supported
                                                  DFTRACER_INC_METADATA needs to be enabled.
    DFTRACER_GOTCHA_PRIORITY         INT     PRIORITY of DFTracer in GOTCHA (default: 1).
    DFTRACER_LOG_LEVEL               STRING  Logging level within DFTracer ERROR/WARN/INFO/DEBUG (default ERROR).
-   DFTRACER_DISABLE_IO              STRING  Disable automatic binding of all I/O calls.
-   DFTRACER_DISABLE_POSIX           STRING  Disable automatic binding of POSIX I/O calls.
-   DFTRACER_DISABLE_STDIO           STRING  Disable automatic binding of STDIO I/O calls.
+   DFTRACER_DISABLE_IO              INT     Disable automatic binding of all I/O calls (default: 1).
+   DFTRACER_DISABLE_POSIX           INT     Disable automatic binding of POSIX I/O calls (default: 1).
+   DFTRACER_DISABLE_STDIO           INT     Disable automatic binding of STDIO I/O calls (default: 1).
    DFTRACER_TRACE_COMPRESSION       INT     Enable trace compression (default 1)
    DFTRACER_DISABLE_TIDS            INT     Disable tracing of thread ids (default 0).
    DFTRACER_WRITE_BUFFER_SIZE       INT     Setup the buffering size for write optimization (default 0). Disabled as 

docs/build.rst

@@ -98,23 +98,25 @@ Download the latest DFTracer release from the Releases_ page or clone the develo
 branch ('develop') from the DFTracer repository
 `https://github.com/hariharan-devarajan/dftracer <https://github.com/hariharan-devarajan/dftracer>`_.
 
-------------------------------------------
-Build ENV Variables
-------------------------------------------
-For pip based installations we can enable HWLOC using
-.. code-block:: Bash
-
-    export DFTRACER_DISABLE_HWLOC=Off
-
-------------------------------------------
-Build CMAKE Variables
-------------------------------------------
-For Cmake based build, we can enable HWLOC using
-.. code-block:: Bash
-
-    cmake -DDISABLE_HWLOC=Off <source dir>
-
-
+---------------
+Build Variables
+---------------
+
+.. table:: section - main build settings using env variables or cmake flags
+   :widths: auto
+
+   ================================ ======  ===========================================================================
+   Environment Variable             Type    Description
+   ================================ ======  ===========================================================================
+   DFTRACER_BUILD_TYPE              STRING  Sets the build type for DFTRACER (default Release). Values are Debug or Release
+   DFTRACER_ENABLE_FTRACING         BOOL    Enables function tracing (default OFF).
+   DFTRACER_ENABLE_MPI              BOOL    Enables MPI Rank (default ON).
+   DFTRACER_DISABLE_HWLOC           BOOL    Disables HWLOC (default ON).
+   DFTRACER_PYTHON_EXE              STRING  Sets path to python executable. Only Cmake.
+   DFTRACER_PYTHON_SITE             STRING  Sets path to python site-packages. Only Cmake.
+   DFTRACER_BUILD_PYTHON_BINDINGS   STRING  Enable python bindings for DFTracer. Only Cmake.
+
+These build variables can be set with cmake as ``-DDISABLE_HWLOC=OFF`` or as environment variables ``export DFTRACER_DISABLE_HWLOC=OFF``
 
 Build DFTracer Dependencies
 ********************************

setup.py

@@ -72,6 +72,8 @@ def build_extension(self, ext: CMakeExtension) -> None:
         # auxiliary "native" libs
         build_type = os.environ.get("DFTRACER_BUILD_TYPE", "Release")
         cmake_args += [f"-DCMAKE_BUILD_TYPE={build_type}"]
+        enable_ftracing = os.environ.get("DFTRACER_ENABLE_FTRACING", "OFF")
+        cmake_args += [f"-DDFTRACER_ENABLE_FTRACING={enable_ftracing}"]
         enable_mpi = os.environ.get("DFTRACER_ENABLE_MPI", "ON")
         cmake_args += [f"-DDFTRACER_ENABLE_MPI={enable_mpi}"]
         disable_hwloc = os.environ.get("DFTRACER_DISABLE_HWLOC", "ON")

src/dftracer/core/dftracer_main.cpp

@@ -110,10 +110,12 @@ bool dftracer::DFTracerCore::finalize() {
       if (stdio_instance != nullptr) {
         stdio_instance->finalize();
       }
+#ifdef DFTRACER_FTRACING_ENABLE
       auto function_instance = dftracer::Function::get_instance();
       if (function_instance != nullptr) {
         function_instance->finalize();
       }
+#endif
     }
     if (logger != nullptr) {
       logger->finalize();
@@ -239,10 +241,14 @@ void dftracer::DFTracerCore::initialize(bool _bind, const char *_log_file,
             brahma::STDIODFTracer::get_instance(conf->trace_all_files);
           }
         }
+#ifdef DFTRACER_FTRACING_ENABLE
         dftracer::Function::get_instance();
+#endif
       }
     } else {
+#ifdef DFTRACER_FTRACING_ENABLE
       dftracer::Function::get_instance()->finalize();
+#endif
     }
     is_initialized = true;
   }

src/dftracer/finstrument/functions.cpp

@@ -1,4 +1,5 @@
 #include <dftracer/finstrument/functions.h>
+#ifdef DFTRACER_FTRACING_ENABLE
 #include <link.h>
 std::shared_ptr<dftracer::Function> dftracer::Function::instance = nullptr;
 
@@ -71,4 +72,5 @@ void __cyg_profile_func_exit(void *func, void *caller) {
                           end_time - start_time, metadata);
     function->logger->exit_event();
   }
-}
+}
+#endif

src/dftracer/finstrument/functions.h

@@ -4,7 +4,9 @@
 
 #ifndef DFTRACER_FUNCTION_H
 #define DFTRACER_FUNCTION_H
-
+/* Config Header */
+#include <dftracer/dftracer_config.hpp>
+#ifdef DFTRACER_FTRACING_ENABLE
 /* Internal Header */
 #include <dftracer/core/logging.h>
 #include <dftracer/core/typedef.h>
@@ -57,5 +59,5 @@ class Function {
 };
 
 }  // namespace dftracer
-
+#endif
 #endif  // DFTRACER_FUNCTION_H

test/CMakeLists.txt

@@ -16,9 +16,9 @@ add_dependencies(test_cpp ${PROJECT_NAME})
 add_dependencies(test_cpp ${PROJECT_NAME}_preload)
 
 add_library(testlib SHARED c/testlib.c)
-target_compile_options(testlib PRIVATE "-g" "-finstrument-functions" "-Wl,-E" "-fvisibility=default")
+target_compile_options(testlib PRIVATE ${DFTRACER_FUNCTION_FLAGS})
 add_executable(test_c c/test.c)
-target_compile_options(test_c PRIVATE "-g" "-finstrument-functions" "-Wl,-E" "-fvisibility=default")
+target_compile_options(test_c PRIVATE ${DFTRACER_FUNCTION_FLAGS})
 target_link_libraries(test_c ${PROJECT_NAME} testlib)
 add_dependencies(test_c ${PROJECT_NAME})
 add_dependencies(test_c ${PROJECT_NAME}_preload)