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Add test app for experimenting with multi-worker OPFS concurrency. Tweak OPFS VFS to significantly improve the otherwise "unfortunate" concurrency situation.

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FossilOrigin-Name: 96f76e7616f8157a342b9e1c42f7b1feab200d182268871a2b25f67d4ee2564c
This commit is contained in:
stephan
2022-11-21 03:50:52 +00:00
parent ae276719f0
commit 27c4cd183d
11 changed files with 364 additions and 96 deletions
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12
ext/wasm/api/sqlite3-api-opfs.js
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@ -92,7 +92,8 @@ const installOpfsVfs = function callee(options){
}
const urlParams = new URL(self.location.href).searchParams;
if(undefined===options.verbose){
options.verbose = urlParams.has('opfs-verbose') ? 3 : 2;
options.verbose = urlParams.has('opfs-verbose')
? (+urlParams.get('opfs-verbose') || 2) : 1;
}
if(undefined===options.sanityChecks){
options.sanityChecks = urlParams.has('opfs-sanity-check');
@ -101,6 +102,8 @@ const installOpfsVfs = function callee(options){
options.proxyUri = callee.defaultProxyUri;
}
//console.warn("OPFS options =",options,self.location);
if('function' === typeof options.proxyUri){
options.proxyUri = options.proxyUri();
}
@ -1154,7 +1157,10 @@ const installOpfsVfs = function callee(options){
[
/* Truncate journal mode is faster than delete or wal for
this vfs, per speedtest1. */
"pragma journal_mode=truncate;"
"pragma journal_mode=truncate;",
/* Set a default busy-timeout handler to help OPFS dbs
deal with multi-tab/multi-worker contention. */
"pragma busy_timeout=2000;",
/*
This vfs benefits hugely from cache on moderate/large
speedtest1 --size 50 and --size 100 workloads. We currently
@ -1162,7 +1168,7 @@ const installOpfsVfs = function callee(options){
sqlite3.wasm. If that policy changes, the cache can
be set here.
*/
//"pragma cache_size=-8388608;"
//"pragma cache_size=-16384;"
].join("")
);
}