borgbase/vykar v0.7.1

on GitHub

Performance

• Streaming compress+encrypt pipeline — backup hot path now produces one Vec per chunk instead of 3–4, with exact-sized pack buffers that avoid glibc ptmalloc2 realloc-shrink pitfalls (~140 MB RSS reduction)
• Eliminate redundant copies on pack upload — zero-copy put_owned for remote backends (S3, REST) avoids one full-pack-size allocation per flush; pre-sized worker chunk Vecs avoid ~7 reallocations per 10 MiB file
• REST backend restore — preallocated get_range buffers and positional write_all_at on Unix halve syscalls per chunk
• LZ4/ZSTD compression — LZ4 writes directly into spare capacity (no zero-fill); ZSTD uses compress_to_buffer to eliminate a ~131 KiB temp Vec per chunk
• FileCache key compaction — replace full path strings with 16-byte BLAKE2b hashes as HashMap keys, saving ~20–35 MB RSS; backwards-compatible deserialization of legacy caches

Bug Fixes

• REST 404 on empty-prefix LIST — list("") now uses the base URL directly instead of appending a trailing slash, with a new repo_list_all handler on the server

Documentation

• Low-resource background backup recipe (ionice, nice, cgroup limits)

Infrastructure

• Extracted shared script library (scripts/lib/) and simplified CLIs for stress.sh, benchmark.sh, and profile.sh

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