steve-downey / cpp-tooling-stats-build2 Goto Github PK

Adaptation of the cpp_tooling_stats headers/modules benchmark to build2.

https://github.com/bfgroup/cpp_tooling_stats

Steps to reproduce:


0. Build GCC from the C++-modules branch:

   https://gcc.gnu.org/wiki/cxx-modules


1. Build build2 from stage:

   Get the install script from:      https://stage.build2.org/0/

   Get the install instruction from: https://build2.org/install.xhtml


2. Clone cpp_tooling_stats next to this project (known to work at 73c9581b8).

   https://github.com/bfgroup/cpp_tooling_stats


3. Apply generate-only.patch to cpp_tooling_stats:

cd cpp_tooling_stats
patch -p1 <../cpp-tooling-stats-build2/generate-only.patch


4. Optionally apply random-include.patch to cpp_tooling_stats:

cd cpp_tooling_stats
patch -p1 <../cpp-tooling-stats-build2/random-include.patch


5. Generate headers and modules source code (adjust DAG depth
   as required):

cd cpp_tooling_stats

modules/parallel_perf.py --dir=../cpp-tooling-stats-build2 \
--kind=headers,modules --def-ints --json-out=/dev/null --dag-depth=36


6. Adjust and run the benchmark script:

   Note: the script requires GNU time(1) and bc(1) utilities (see below
         on how to run manually instead).

   Edit the bencharm script and adjust jobs count (default is 8) and
   GCC compiler name (default is g++-m):

cd cpp-tooling-stats-build2
nano benchmark

   Then run:

./benchmark

   The final output should be along these lines:

headers/make:   7.47
headers/build2: 8.03
modules/build2: 2.02


7. To run each test manually:

cd cpp-tooling-stats-build2

make -j 8 CXX=g++-m clean
time make -j 8 CXX=g++-m

b -j 8 config.cxx=g++-m clean: headers/
time b -j 8 config.cxx=g++-m headers/

b -j 8 config.cxx=g++-m clean: modules/
time b -j 8 config.cxx=g++-m modules/