perf(io): parallel order-preserving BGZF compression for BAM output - #276
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New BgzfWriter: the caller fills 64 KiB blocks, --runThreadN dedicated threads compress them with libdeflate, and one writer thread emits them in submission order. Output is byte-identical to noodles_bgzf at every thread count. All four BAM writers use it. finish() now writes the EOF marker and propagates errors instead of relying on drop. Refs #223 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This was referenced Sep 29, 2026
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Refs #223 (option 1: parallel compression; record encoding still single-threaded).
src/io/bgzf_writer.rs: blocks are filled by the caller, compressed by--runThreadNdedicated threads (not rayon), and written in order by one thread.--runThreadN 1runs inline as before.noodles_bgzf::io::Writer: same block boundaries, libdeflate at the same level, same headers/trailers/EOF. Unit tests compare byte for byte across sizes, levels 0/1/6/12, 1/2/5 threads, irregular writes and flushes;cmpon real runs matched for BAM Unsorted, SortedByCoordinate and SAM.finish()previously called a no-op and relied on drop to write the EOF marker, discarding errors. It now writes EOF, flushes and returns errors.lib.rs,Cargo.tomlor input decoding, so it is independent of perf(align): cut the align batch size and stop cloning every FASTQ record #222, perf(pipeline): size alignment batches so the result vector stays off the arena path #261, feat(io): optional pure-Rust parallel gzip input decoding (rapidgzip-core) #225, chore(deps): bump noodles 0.113 -> 0.115, noodles-bgzf 0.49 -> 0.51 #211, chore(deps): bump noodles from 0.113.0 to 0.116.0 #259.Wall time, 2M SE 100 bp reads, synthetic 20 Mb genome, BAM Unsorted, 16-core Mac (median of 3):
At 16 threads with
--outBAMcompression 6: 5.00s → 2.92s.Follow-up (not here): move BAM record encoding into the parallel align stage (conflicts with #222/#261), and
bam_dedup.rs's own writer.Tests: fmt, clippy 0 warnings,
cargo test636 passed.🤖 Generated with Claude Code