post_build_ninja_summary.py gives a summary of a ninja build. It can be
run standalone or it can be run automatically by autoninja. This CL
updates the Python script and the autoninja bash script to make this
work on Linux. This includes removing a zero-value assert, and ensuring
that .so files get categorized as such.
Change-Id: I2d59ab129f5ce70117beeb119719f8432bfbab7c
Reviewed-on: https://chromium-review.googlesource.com/915053
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
post_build_ninja_summary.py analyzes the .ninja_log file in an output
directory to summarize build performance. It lists the most expensive
build steps, and build-step types, printing both their elapsed time and,
more importantly, their "weighted" time which is a measure of their
contribution to the total build time.
For each time segment within the build the running build steps
accumulate weighted time that is proportional to the elapsed time
divided by the number of tasks running. If a thousand compilation steps
are running in parallel then they will each be "charged" for 1/1,000th
of the elapsed time. If a single link step is running alone then it is
charged with all of the elapsed time.
Bug: chromium:787983
Change-Id: Id5aea715f798a16415dd0365a27f0051202668e5
Reviewed-on: https://chromium-review.googlesource.com/871988
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Erik Staab <estaab@chromium.org>
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Bruce Dawson