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support/scripts/graph-build-time: add support for timeline graphing

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This commit adds support for a new type of graph, showing the timeline
of a build. It shows, with one line per package, when each of this
package steps started/ended, and therefore allows to see the
sequencing of the package builds.

For a fully serialized build like we have today, this is not super
useful (except to show that everything is serialized), but it becomes
much more useful in the context of top-level parallel build.

We chose to order the graph by the time-of-configure, as it is the
closest to the actual cascade-style of a true dependency graph, which is
tiny bit more complex to achieve properly. The actual result still looks
pretty good.

The graph-build make target is extended to also generate this new
timeline graph.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
[yann.morin.1998@free.fr:
  - sort by start-of-configure time
  - re-use existing colorsets (default or alternate)
  - fix python2isms
  - fix check-package
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
This commit is contained in:
Thomas Petazzoni
2022-02-09 21:30:26 +01:00
committed by Yann E. MORIN
parent 842ba7ecef
commit 5e8b01afd5
2 changed files with 65 additions and 1 deletions
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3
Makefile
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@@ -871,6 +871,9 @@ graph-build: $(O)/build/build-time.log
--type=pie-$(t) --input=$(<) \
--output=$(GRAPHS_DIR)/build.pie-$(t).$(BR_GRAPH_OUT) \
$(if $(BR2_GRAPH_ALT),--alternate-colors)$(sep))
./support/scripts/graph-build-time --type=timeline --input=$(<) \
--output=$(GRAPHS_DIR)/build.timeline.$(BR_GRAPH_OUT) \
$(if $(BR2_GRAPH_ALT),--alternate-colors)
.PHONY: graph-depends-requirements
graph-depends-requirements: