Matthew Stanley
fbc5182947
compile_overlays: parallelize capture compilation (--jobs, default cores-2)
...
The offline cache build ran one capture at a time - classify, recompiler
subprocess, patch/audit, gcc - so a full coverage-vault rebuild (Tomba 2:
1293 captures) took hours. The wall clock is subprocess-dominated and the
subprocesses release the GIL, so a ThreadPoolExecutor across captures
fills the machine: measured ~24x on the capture-reprocess phase
(6/min -> ~143/min, 24 concurrent recompiler/gcc children).
Concurrency contract:
- cov_lock guards the per-region dedup coverage sets. The
check->build->update window is deliberately unlocked: concurrent
captures may build overlapping DLLs - redundancy, never corruption
(the loader content-matches every function by (entry, code_crc)
across all DLLs at a region).
- A per-(region, crc32) key lock serializes captures of IDENTICAL bytes,
which share one dll/ranges filename: the second sees the first build
(dll-exists skip / prior-ranges merge) exactly as it would sequentially.
- The interior-fragment pass still runs after all captures, reading the
final on-disk entry coverage (unchanged failure-domain decoupling).
- Per-thread stdout capture prints each capture log as one atomic block.
- --jobs 1 and --static take the exact sequential path.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com >
2026-07-10 15:52:12 -07:00
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