The differential and llvm-differential corpus split their programs across the ten Linux test shards by a hash of
the program's name, so a shard's share of the measured work varied from 565 to 913 s (plain) and 868 to 1358 s
(sanitized). corpusSelect assigns programs longest first to the lightest shard by their measured cost per flavor
(tests/harness/corpus-costs.json: the differential plus llvm-differential milliseconds on a CI runner, medians of
four green main runs), giving 740-741 s and 1098-1099 s. Both harnesses still select identically, so a shard's
compile cache serves both. Programs without a measurement weigh as much as the median one.
scripts/ci-corpus-costs.mjs refreshes the table from downloaded CI shard logs.
Chris Tate
a08abf4abc