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sqlite3.oo1.OpfsDb: default to journal_mode=persist, as current tests show it to be marginally faster than truncate/delete in Chrome v109. Also increase default busy_timeout from 2 seconds to 3, admittedly on a whim.

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FossilOrigin-Name: d0c8fa30a31c691bc1be5e98d806eeb1e23a8fc6cd54d87e5c1b720aa936e707
This commit is contained in:
stephan
2022-11-29 18:28:40 +00:00
parent 6e86d5569d
commit 72ee096775
3 changed files with 13 additions and 11 deletions
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10
ext/wasm/api/sqlite3-api-opfs.js
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@ -1216,12 +1216,14 @@ const installOpfsVfs = function callee(options){
sqlite3.oo1.DB.dbCtorHelper.setVfsPostOpenSql(
opfsVfs.pointer,
[
/* Truncate journal mode is faster than delete or wal for
this vfs, per speedtest1. */
"pragma journal_mode=truncate;",
/* Truncate journal mode is faster than delete for
this vfs, per speedtest1. That gap seems to have closed with
Chome version 108 or 109, but "persist" is very roughly 5-6%
faster than truncate in initial tests. */
"pragma journal_mode=persist;",
/* Set a default busy-timeout handler to help OPFS dbs
deal with multi-tab/multi-worker contention. */
"pragma busy_timeout=2000;",
"pragma busy_timeout=3000;",
/*
This vfs benefits hugely from cache on moderate/large
speedtest1 --size 50 and --size 100 workloads. We currently