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For large configurations, the execution time of remove_transitive_deps() becomes really high, due to the number of nested loops + the is_dep() function being recursive. For an allyespackageconfig, the remove_extra_deps() function takes 334 seconds to execute, and the overall time to generate the .dot file is 6 minutes and 39 seconds. Here is a timing of the different graph-depends steps and the overall execution time: Getting dependencies: 42.5735 seconds Turn deps into a dict: 0.0023 seconds Remove extra deps: 334.1542 seconds Get version: 22.4919 seconds Generate .dot: 0.0197 seconds real 6m39.289s user 6m16.644s sys 0m8.792s By adding a very simple cache for the results of is_dep(), we bring down the execution time of the "Remove extra deps" step from 334 seconds to just 4 seconds, reducing the overall execution time to 1 minutes and 10 seconds: Getting dependencies: 42.9546 seconds Turn deps into a dict: 0.0025 seconds Remove extra deps: 4.9643 seconds Get version: 22.1865 seconds Generate .dot: 0.0207 seconds real 1m10.201s user 0m47.716s sys 0m7.948s Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Tested-by: Gustavo Zacarias <gustavo.zacarias@free-electrons.com> [yann.morin.1998@free.fr: - rename is_dep() to is_dep_uncached(), keep existig code as-is - add is_dep() as a cached-version of is_dep_uncached() - use constructs more conform with 2to3 - use exceptions (EAFP) rather than check-before-use (LBYL) to be more pythonist; that even decreases the duration yet a little bit more! ] Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Readme ====== Kconfiglib ---------- This python module, developped by Ulf Magnusson and released under the ISC license, is fetched from: https://github.com/ulfalizer/Kconfiglib commit: a95f477eafc0b6708c3ce671fce7302ecec4f789 Kconfiglib license ~~~~~~~~~~~~~~~~~~ License (ISC) Copyright (c) 2011-2013, Ulf Magnusson <ulfalizer@gmail.com> Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.