⚡ Bolt: Enable SQLite Memory-Mapped I/O for Local Metadata Store#188
⚡ Bolt: Enable SQLite Memory-Mapped I/O for Local Metadata Store#188thebearwithabite wants to merge 1 commit intomasterfrom
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Fixed a bug where `PRAGMA mmap_size` was incorrectly assigned a string (`'XXXXXXXXX'`) instead of an integer. Because SQLite silently ignores invalid PRAGMA values, memory-mapped I/O was completely disabled. This patch sets the value to `268435456` (256MB) to correctly enable memory-mapped I/O and significantly improve database read performance. Also logged learning in `.jules/bolt.md`. Co-authored-by: thebearwithabite <216692431+thebearwithabite@users.noreply.github.com>
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💡 What: Replaced the invalid string
'XXXXXXXXX'with the integer268435456inlocal_metadata_store.pyforPRAGMA mmap_size. Added a journal entry logging the learning.🎯 Why: Invalid PRAGMA values in SQLite fail silently. Because of the string placeholder, the database wasn't actually enabling memory-mapped I/O as intended by the developer (comment
# 256MB). Enablingmmap_sizeoptimizes I/O and speeds up database reads, which is crucial for a local metadata store.📊 Impact: Properly enables memory-mapped I/O for up to 256MB of database file size, drastically reducing memory copy overhead during read operations.
🔬 Measurement: Code was verified manually using a temporary script to test
PRAGMA mmap_sizebehavior, confirming that a string sets it to 0 and an integer sets it to the intended value.PR created automatically by Jules for task 5005377279755165471 started by @thebearwithabite