[RAWL-3481] Use 8 zstd workers and compression level 3 for create-layer#122
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Flush zstd writer between files to bound memory with multi-threaded compression. Without periodic flushes, multi-threaded zstd buffers input asynchronously, causing memory usage to grow up to the full uncompressed layer size. Declare cpu:8 execution_requirements for zstd OCI layer actions. ocitool create-layer spawns 8 zstd worker threads internally. Without declaring this cost, Bazel over-subscribes the machine by scheduling too many concurrent zstd layer builds. Add conditional execution_requirements so Bazel's scheduler accounts for the actual CPU usage (8 for zstd, default 1 for gzip).
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bcmyers
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Apr 30, 2026
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Summary
cpu:8execution requirement on zstd layer actions in Bazel so the scheduler reserves cores accordingly