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Ramon Roche
89c68cd37f
Each build job compiled its group one target at a time, and the serial parts of every build (configure, the NuttX make, linking) left the 4-vCPU runners about half idle. Two concurrent builds keep them around 80% busy and cut total build-step time about 24% and runner cost about 17%. Larger runners and more slots were measured and cost more than they save. build_all_runner.py replaces build_all_runner.sh. NuttX compiles inside its source tree, so each extra slot is a git worktree under .build_slots/. All submodules are fetched once before building, each slot clones them locally from the checkout, and builds run with GIT_SUBMODULES_ARE_EVIL=1 so CMake's per-configure submodule check does not sync and update them concurrently on the shared .git/config. Targets that write the same build/ directory (<board>_deb with <board>_default, the metadata targets with px4_sitl_default) always share a slot, and the runner refuses a plan that would split them. Every target is built even after a failure. Build output streams with a [seconds|slot target] prefix, each target prints its memory usage or, on failure, the excerpt from the first error, and a Build Logs step prints each target's full log as one collapsed group. Slot build directories are moved into build/, so packaging is unchanged. The matrix now carries targets as a list plus a slot count from build_all_config.yml; the comma-joined string existed only because workflow expressions could not pass an array to a shell command, which join() now does. The scan job runs new tests for the generated matrix and the slot assignment. Assisted-by: Claude:claude-opus-5-5 Signed-off-by: Ramon Roche <mrpollo@gmail.com>