btindex: use off-heap EliasFano during build#21777
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…ndex build NewEliasFano allocates a multi-GB contiguous bit array on the Go heap for large snapshots (mainnet: ~2B keys → ~3.5 GB). NewEliasFanoOffHeap backs the same arrays with a mmap'd temp file so the OS pages it, avoiding the heap spike.
AskAlexSharov
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Re-run needed: both hive failures are infra flakes (Docker daemon EOF + operation cancelled), not related to the code change. |
JkLondon
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Bloatnet has "peak mem jumps during merge". On heap-profiler I saw
3Gbused byEFinside.btbuilding.And for #20638
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