five/hbrdd at 3fa553d3ed0187fcbc026ab7a2e37918683ab483 - five

Files

Charles KWON OhJun 3fa553d3ed perf: DBF mmap — zero-copy record reads, SCAN 2-3x faster

syscall.Mmap on DBF open for zero-copy GoTo:
- GoTo: copy from mmap slice instead of file.ReadAt syscall
- Eliminates kernel context switch per record read
- Unmap before Append (file grows), Close, Flush
- Re-mmap after Flush

Benchmark (ext4, home dir):
  10K SCAN: 4ms → 2ms (Harbour 1ms = 2x)
  10K DUPKEY: 6ms → 4ms (Harbour 4ms = 1x!)
  10K DELSCAN: 6ms → 2ms (Harbour 2ms = 1x!)
  50K SCAN: 26ms → 15ms (42% faster)
  50K DELSCAN: 29ms → 17ms (Harbour 17ms = 1x!)
  50K DUPKEY: 41ms → 29ms (Harbour 23ms = 1.3x)
  CDX SCAN: 13ms → 4ms (Harbour 6ms — FASTER!)
  CDX SCOPE: 9ms → 3ms (Harbour 4ms — FASTER!)

82/82 stress PASS. All unit tests PASS.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-07 19:06:21 +09:00

cdx

perf: CDX zero-alloc internal node seek — SEEK 45% faster

2026-04-07 14:05:20 +09:00

dbf

perf: DBF mmap — zero-copy record reads, SCAN 2-3x faster

2026-04-07 19:06:21 +09:00

mem

feat: SET DELETED filtering, SEEK/LOCATE/CONTINUE, SET command codegen

2026-04-02 22:33:59 +09:00

ntx

perf: proper 3-level bulk build — INDEX 50K: 180ms → 28ms (6.4x)