Collin Funk wrote: > >> I have no clue if this has a noticeable performance impact or not. > > > > Can you measure it, please? For example, with > > GNULIB_TOOL_IMPL=py time ./test-all.sh > > > > I measure a difference in the 2% range, but it's not clear to me whether > > -B slows down or speeds up things :) > > Sure, here is the results using the -B flag. I'm removing the > __pycache__ directory before using -B flag to make sure it doesn't get > read. > > Using 'env GNULIB_TOOL_IMPL=py ./test-all.sh' in import-tests: > > no -B flag: 0m16.699s > -B flag: 0m20.892s > > Using 'env GNULIB_TOOL_IMPL=py ./test-all.sh' in create-tests: > > no -B flag: 2m45.046s > -B flag: 2m46.674s
Thanks for measuring it. So, the -B flag causes a slowdown. > The create-tests spend most of their time in autoconf and friends if I > remember correctly. > > The import tests feel noticeably slower with -B to me. This is explained by the fact that the import tests do nearly 100 gnulib-tool invocations: The same just-in-time compilation must happen in memory 100 times. This explains the 4 seconds of slowdown. Bruno
