how-to-build.txt

=========================================================================================
Additional libraries/packages/tools needed for Fail*:
=========================================================================================

Required for Fail*:
**********************************************************************
 - libprotobuf-dev
 - libpcl1-dev
 - libboost-thread-dev
 - protobuf-compiler
 - cmake
 - cmake-curses-gui
 - binutils-dev
 - AspectC++ (ag++, ac++): AspectC++ 1.1 or newer is known to work and can be
   obtained from http://www.aspectc.org; nightlies can be downloaded from
   http://akut.aspectc.org

Required for the Bochs simulator backend:
**********************************************************************
 - libpthread
 - Probably more, depending on, e.g., the GUI you configure (X11 ->
   libsvga1-dev, libxrandr-dev)

Required for the gem5 simulator backend:
**********************************************************************
 - SCons
 - SWIG
 - zlib
 - m4
 - python-dev
 - optional: libgoogle-perftools-dev

For distribution/parallelization:
**********************************************************************
 - rsync
 - tmux


32-bit FailBochs on x86_64 Linux machines:
**********************************************************************
 - Create a "bochslibs" directory and fill it with all necessary libraries from
   your build machine:
     $ mkdir bochslibs
     $ cp -v $(ldd fail-client|awk '{print $3}'|egrep -v '\(|lib(pthread|selinux|c.so.)|^$') bochslibs/
 - Copy this directory to ~/bochslibs on all machines lacking these libraries
   (this may also be the case for i386 machines you cannot install library
   packages on yourself).  client.sh will add ~/bochslibs to LD_LIBRARY_PATH if
   it exists.

=========================================================================================
Compiling, building and modifying: Simulators and Fail*
=========================================================================================

Building Fail*:
**********************************************************************

For the first time:
------------------------------------------------------------
 1. Enter the "fail/" directory (${FAIL_DIR}, see also "fail-structure.txt"):
      $ cd fail/
 2. (Optional) Cleanup previous CMake remnants:
      $ find -name CMakeCache.txt | xargs rm
 3. Create out of source build directory (${BUILD_DIR}, see also "fail-structure.txt"):
      $ mkdir build
    Note that currently this build directory must be located somewhere below
    the fail/ directory, as generated .ah files in there will not be included
    in the compile process otherwise.
 4. Enter out-of-source build directory.  All generated files end up there.
      $ cd build
 5. Generate CMake environment.
      $ cmake ..
 6. Setup build configuration by opening the CMake configuration tool
      $ ccmake .
    Select "BUILD_BOCHS" or "BUILD_GEM5".  Select an experiment to enable by
    naming its "experiments/" subdirectory under "EXPERIMENTS_ACTIVATED".
    Configure Fail* features you need for this experiment by enabling
    "CONFIG_*" options.  Press 'c', 'g' to regenerate the build system.
    (Alternatively use
      $ cmake-gui .
    for a Qt GUI.)  To enable a Debug build, choose "Debug" as the build type,
    otherwise choose "Release".
    If building FailBochs, optionally set up the bochs configure flags
    for your need.


After changes to Fail* code:
------------------------------------------------------------
Compile (in ${BUILD_DIR}, optionally "add -jN" for parallel building):
  $ make
CMake will build all Fail* libraries and link them with the simulator backend
library to a binary called "fail-client".  You may use the shell script
  $ ${FAIL_DIR}/scripts/rebuild-bochs.sh [-]
to speed up repetitive tasks regarding Fail/Bochs builds.  This script contains
a concise documentation on itself.


Add new Fail* sources to build chain:
------------------------------------------------------------
To add new source files to the build, see CMakeLists.txt in the subdirectory of the
corresponding component in "${FAIL_DIR}/src/core/", and probably consultate the
CMake docs: http://cmake.org/cmake/help/documentation.html


Add new experiment/plugin/campaign:
------------------------------------------------------------
Look at "${FAIL_DIR}/src/experiments/coolchecksum/" as a template.  After creating a
new subdirectory in "experiments/", activate it in the CMake configuration step (see
above).


Generating the Doxygen documentation for Fail*:
**********************************************************************
To generate the Doxygen documentation, type:
  $ make doc
The documentation files (HTML and LaTeX) are located in "${BUILD_DIR}/src/core/doc/".
To open the HTML documentation, type:
  $ firefox src/core/doc/html/index.html
(You may want to replace "firefox" with your favourite browser.) The LaTeX docs need
to be compiled previously:
  $ cd src/core/doc/latex; make


FailBochs: Bochs configuration features
**********************************************************************

 The autotools-based bochs is configured within the Fail* build run. 
 The configuration flags can be set within the ccmake configuration (ccmake ${FAIL_DIR}/build)
     - Sufficient:
         --enable-cpu-level=6;--enable-ne2000;--enable-trace-cache;--enable-gdb-stub;--disable-docbook
     - More simulator features (FailBochs default configuration):
         --enable-a20-pin;--enable-x86-64;--enable-cpu-level=6;--enable-ne2000;--enable-acpi;--enable-pci;--enable-usb;--enable-trace-cache;--enable-fast-function-calls;--enable-host-specific-asms;--enable-disasm;--enable-readline;--enable-clgd54xx;--enable-fpu;--enable-vmx=2;--enable-monitor-mwait;--enable-cdrom;--enable-sb16=linux;--enable-gdb-stub;--disable-docbook;--with-all-libs
    Instead of --with-all-libs, you could use --with-nogui for "headless" experiments,
    additionally removing lots of library dependencies (thus reducing startup overhead).
    --with-x11 enables only the "x" (X11), --with-wx only the "wx" (wxWidgets) GUI.
    Note that "wx" does not play well together with Fail*'s "restore" feature (FailBochs
    will fall back to "x" if available, or die trying.)
    Once you know everything works as it should, you may want to add the
    following flags before running larger campaigns:
      --disable-logging --disable-assert-checks
    Make sure --enable-repeat-speedups (--enable-all-optimizations implicitly
    enables this) is not enabled; you will otherwise encounter funny effects
    when tracing REP-prefixed instructions.
    FIXME: Remove more redundant flags/libraries


After changes to Bochs code:
------------------------------------------------------------
 - Just re-run "make" in ${BUILD_DIR}, or call "scripts/rebuild-bochs.sh -".
   The latter automatically runs "make install" after rebuilding fail-client
   (and probably the experiment's campaign server).
 - Cleaning up (forcing a complete rebuild of libfailbochs.a next time):
     $ make bochsallclean
   This is especially necessary if you changed a Bochs-affecting aspect header
   (.ah), as the build system does not know about Bochs sources depending on
   certain aspects.


Debug build:
------------------------------------------------------------
Configure Bochs to use debugging-related compiler flags (expects to be in ${BUILD_DIR}):
  $ cd ../simulator/bochs
  $ CFLAGS="-g -O0" CXXFLAGS="-g -O0" ./configure --prefix=... ... (see above)
You might additionally want to configure the rest of Fail* into debug mode by
setting CMAKE_BUILD_TYPE to "Debug" (ccmake, see above).


Profiling-based optimization build:
------------------------------------------------------------
FIXME: ag++ needs to be run with --keep_woven
Configure Bochs to use compiler flags to enable profiling:
  $ cd ../simulator/bochs
  $ CFLAGS="-fprofile-generate" CXXFLAGS="-fprofile-generate" LDFLAGS="-fprofile-generate" ./configure --prefix=... ... (see above)
Build Bochs normally, and run it.  Configure Bochs to use compiler flags to enable
optimizations based on profiling results:
  $ CFLAGS="-fprofile-use -Wcoverage-mismatch" CXXFLAGS="-fprofile-use -Wcoverage-mismatch" LDFLAGS="-fprofile-use" ./configure --prefix=... ... (see above)


Benchmarking:
------------------------------------------------------------
Simple instructions/second measurement:
 - Configure Bochs with --enable-show-ips (see above)
 - Modify the bochsrc: print_timestamps: enabled=1
Comparison IPS numbers are shown in the default "bochsrc". Headless bochsrc configuration,
all aspects disabled, guest system executes endless loop, host CPU Xeon X5470 (3.33GHz):
IPS: 66124283 average = 66964789


Building gem5:
**********************************************************************

Fail* configuration:
------------------------------------------------------------
 - BUILD_GEM5 ON
 - BUILD_ARM ON
 - all configuration options specific for other simulators OFF
 - Release or Debug choice must match gem5 in the following

For the first time:
------------------------------------------------------------
 1. Change to the gem5 simulator directory (expects to be in ${FAIL_DIR}):
      $ cd simulators/gem5
 2. Build gem5 using the commands below until it fails finding the fail-libs
 3. Build fail
 4. Select an experiment (see below)
 5. Build gem5 again. THe fail-libs should be found now.

Optimized build:
------------------------------------------------------------
      $ cd ../simulator/gem5
      $ scons EXTRAS=../../src/core/sal/gem5 build/ARM/gem5.fast
(add -jN for a parallel build)

Debug build:
------------------------------------------------------------
      $ cd ../simulator/gem5
      $ scons EXTRAS=../../src/core/sal/gem5 build/ARM/gem5.debug
(add -jN for a parallel build)

Selecting an experiment:
------------------------------------------------------------
 1. Edit ../src/core/sal/gem5/SConscript
    In line starting with (gStaticLibs = ...) change -lfail-arch-test to
    -lfail-EXPERIMENTNAME