Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 31 insertions, 0 deletions

diff --git a/docs/performance/build_metrics/build_metrics.md b/docs/performance/build_metrics/build_metrics.md
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+# Build Metrics
+
+**Build Metrics** is a catch-all term for performance measures that are
+generated by the Firefox build system and tracked by Perfherder.
+
+## num_constructors
+
+Number of static constructors found by the compiler in the Firefox C++
+codebase. Lower is better. Static constructors are undesirable because
+their initialization imposes an unavoidable time penalty every time
+Firefox is started.
+
+## installer size
+
+Size in bytes of the Firefox installer. Lower is better here, especially
+on space-restricted platforms like Android.
+
+## build times
+
+Amount of time it takes to build Firefox in automation on a specific
+platform / configuration. Lower is better.
+
+## compiler warnings
+
+Number of compiler warnings detected during a build. Lower is better.
+
+Due to the way the build system works, compiler warnings are not
+consistently detected. So the value may fluctuate from build to build
+even if the number of compiler warnings didn\'t actually change. Since
+Perfherder alerts are calculated based on the mean value of a range, a
+regression may be reported as a fractional value.