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mirror of https://github.com/sqlite/sqlite.git synced 2025-07-29 08:01:23 +03:00

OPFS VFS: add the opfs-unlock-asap=1 URI flag which tells the VFS to release implicit locks ASAP instead of during VFS idle time. This improves concurrency notably in the test app but brings a significant performance penalty in speedtest1 (roughly 4x slowdown). This is not the final word in OPFS concurrency, but gets us a step further.

FossilOrigin-Name: 9542f9ce9e023b489e2d93661f719fb0751c1e28f72fded9d3c2156d5777e7b1
This commit is contained in:
stephan
2022-11-26 15:24:58 +00:00
8 changed files with 157 additions and 64 deletions

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@ -201,9 +201,8 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
*/
dbCtorHelper.normalizeArgs = function(filename=':memory:',flags = 'c',vfs = null){
const arg = {};
if(1===arguments.length && 'object'===typeof arguments[0]){
const x = arguments[0];
Object.keys(x).forEach((k)=>arg[k] = x[k]);
if(1===arguments.length && arguments[0] && 'object'===typeof arguments[0]){
Object.assign(arg, arguments[0]);
if(undefined===arg.flags) arg.flags = 'c';
if(undefined===arg.vfs) arg.vfs = null;
if(undefined===arg.filename) arg.filename = ':memory:';

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@ -348,12 +348,32 @@ const installOpfsVfs = function callee(options){
'SQLITE_NOTFOUND',
'SQLITE_OPEN_CREATE',
'SQLITE_OPEN_DELETEONCLOSE',
'SQLITE_OPEN_MAIN_DB',
'SQLITE_OPEN_READONLY'
].forEach((k)=>{
if(undefined === (state.sq3Codes[k] = capi[k])){
toss("Maintenance required: not found:",k);
}
});
state.opfsFlags = Object.assign(Object.create(null),{
/**
Flag for use with xOpen(). "opfs-unlock-asap=1" enables
this. See defaultUnlockAsap, below.
*/
OPFS_UNLOCK_ASAP: 0x01,
/**
If true, any async routine which implicitly acquires a sync
access handle (i.e. an OPFS lock) will release that locks at
the end of the call which acquires it. If false, such
"autolocks" are not released until the VFS is idle for some
brief amount of time.
The benefit of enabling this is much higher concurrency. The
down-side is much-reduced performance (as much as a 4x decrease
in speedtest1).
*/
defaultUnlockAsap: false
});
/**
Runs the given operation (by name) in the async worker
@ -844,9 +864,15 @@ const installOpfsVfs = function callee(options){
//xSleep is optionally defined below
xOpen: function f(pVfs, zName, pFile, flags, pOutFlags){
mTimeStart('xOpen');
let opfsFlags = 0;
if(0===zName){
zName = randomFilename();
}else if('number'===typeof zName){
if(capi.sqlite3_uri_boolean(zName, "opfs-unlock-asap", 0)){
/* -----------------------^^^^^ MUST pass the untranslated
C-string here. */
opfsFlags |= state.opfsFlags.OPFS_UNLOCK_ASAP;
}
zName = wasm.cstringToJs(zName);
}
const fh = Object.create(null);
@ -854,7 +880,7 @@ const installOpfsVfs = function callee(options){
fh.filename = zName;
fh.sab = new SharedArrayBuffer(state.fileBufferSize);
fh.flags = flags;
const rc = opRun('xOpen', pFile, zName, flags);
const rc = opRun('xOpen', pFile, zName, flags, opfsFlags);
if(!rc){
/* Recall that sqlite3_vfs::xClose() will be called, even on
error, unless pFile->pMethods is NULL. */
@ -1145,6 +1171,9 @@ const installOpfsVfs = function callee(options){
//TODO to support fiddle and worker1 db upload:
//opfsUtil.createFile = function(absName, content=undefined){...}
//We have sqlite3.wasm.sqlite3_wasm_vfs_create_file() for this
//purpose but its interface and name are still under
//consideration.
if(sqlite3.oo1){
opfsUtil.OpfsDb = function(...args){

View File

@ -105,7 +105,7 @@ metrics.dump = ()=>{
*/
const __openFiles = Object.create(null);
/**
__autoLocks is a Set of sqlite3_file pointers (integers) which were
__implicitLocks is a Set of sqlite3_file pointers (integers) which were
"auto-locked". i.e. those for which we obtained a sync access
handle without an explicit xLock() call. Such locks will be
released during db connection idle time, whereas a sync access
@ -117,7 +117,7 @@ const __openFiles = Object.create(null);
penalty: speedtest1 benchmarks take up to 4x as long. By delaying
the lock release until idle time, the hit is negligible.
*/
const __autoLocks = new Set();
const __implicitLocks = new Set();
/**
Expects an OPFS file path. It gets resolved, such that ".."
@ -166,7 +166,7 @@ const closeSyncHandle = async (fh)=>{
const h = fh.syncHandle;
delete fh.syncHandle;
delete fh.xLock;
__autoLocks.delete(fh.fid);
__implicitLocks.delete(fh.fid);
return h.close();
}
};
@ -190,10 +190,10 @@ const closeSyncHandleNoThrow = async (fh)=>{
};
/* Release all auto-locks. */
const closeAutoLocks = async ()=>{
if(__autoLocks.size){
const releaseImplicitLocks = async ()=>{
if(__implicitLocks.size){
/* Release all auto-locks. */
for(const fid of __autoLocks){
for(const fid of __implicitLocks){
const fh = __openFiles[fid];
await closeSyncHandleNoThrow(fh);
log("Auto-unlocked",fid,fh.filenameAbs);
@ -201,6 +201,20 @@ const closeAutoLocks = async ()=>{
}
};
/**
An experiment in improving concurrency by freeing up implicit locks
sooner. This is known to impact performance dramatically but it has
also shown to improve concurrency considerably.
If fh.releaseImplicitLocks is truthy and fh is in __implicitLocks,
this routine returns closeSyncHandleNoThrow(), else it is a no-op.
*/
const releaseImplicitLock = async (fh)=>{
if(fh.releaseImplicitLocks && __implicitLocks.has(fh.fid)){
return closeSyncHandleNoThrow(fh);
}
};
/**
An error class specifically for use with getSyncHandle(), the goal
of which is to eventually be able to distinguish unambiguously
@ -246,7 +260,7 @@ GetSyncHandleError.convertRc = (e,rc)=>{
still fails at that point it will give up and propagate the
exception.
*/
const getSyncHandle = async (fh)=>{
const getSyncHandle = async (fh,opName)=>{
if(!fh.syncHandle){
const t = performance.now();
log("Acquiring sync handle for",fh.filenameAbs);
@ -262,20 +276,21 @@ const getSyncHandle = async (fh)=>{
}catch(e){
if(i === maxTries){
throw new GetSyncHandleError(
e, "Error getting sync handle.",maxTries,
e, "Error getting sync handle for",opName+"().",maxTries,
"attempts failed.",fh.filenameAbs
);
}
warn("Error getting sync handle. Waiting",ms,
warn("Error getting sync handle for",opName+"(). Waiting",ms,
"ms and trying again.",fh.filenameAbs,e);
await closeAutoLocks();
//await releaseImplicitLocks();
Atomics.wait(state.sabOPView, state.opIds.retry, 0, ms);
}
}
log("Got sync handle for",fh.filenameAbs,'in',performance.now() - t,'ms');
log("Got",opName+"() sync handle for",fh.filenameAbs,
'in',performance.now() - t,'ms');
if(!fh.xLock){
__autoLocks.add(fh.fid);
log("Auto-locked",fh.fid,fh.filenameAbs);
__implicitLocks.add(fh.fid);
log("Auto-locked for",opName+"()",fh.fid,fh.filenameAbs);
}
}
return fh.syncHandle;
@ -409,7 +424,7 @@ const vfsAsyncImpls = {
xClose: async function(fid/*sqlite3_file pointer*/){
const opName = 'xClose';
mTimeStart(opName);
__autoLocks.delete(fid);
__implicitLocks.delete(fid);
const fh = __openFiles[fid];
let rc = 0;
wTimeStart(opName);
@ -474,13 +489,14 @@ const vfsAsyncImpls = {
wTimeStart('xFileSize');
try{
affirmLocked('xFileSize',fh);
const sz = await (await getSyncHandle(fh)).getSize();
const sz = await (await getSyncHandle(fh,'xFileSize')).getSize();
state.s11n.serialize(Number(sz));
rc = 0;
}catch(e){
state.s11n.storeException(2,e);
rc = GetSyncHandleError.convertRc(e,state.sq3Codes.SQLITE_IOERR);
}
await releaseImplicitLock(fh);
wTimeEnd();
storeAndNotify('xFileSize', rc);
mTimeEnd();
@ -495,8 +511,8 @@ const vfsAsyncImpls = {
if( !fh.syncHandle ){
wTimeStart('xLock');
try {
await getSyncHandle(fh);
__autoLocks.delete(fid);
await getSyncHandle(fh,'xLock');
__implicitLocks.delete(fid);
}catch(e){
state.s11n.storeException(1,e);
rc = GetSyncHandleError.convertRc(e,state.sq3Codes.SQLITE_IOERR_LOCK);
@ -508,10 +524,10 @@ const vfsAsyncImpls = {
mTimeEnd();
},
xOpen: async function(fid/*sqlite3_file pointer*/, filename,
flags/*SQLITE_OPEN_...*/){
flags/*SQLITE_OPEN_...*/,
opfsFlags/*OPFS_...*/){
const opName = 'xOpen';
mTimeStart(opName);
const deleteOnClose = (state.sq3Codes.SQLITE_OPEN_DELETEONCLOSE & flags);
const create = (state.sq3Codes.SQLITE_OPEN_CREATE & flags);
wTimeStart('xOpen');
try{
@ -526,14 +542,8 @@ const vfsAsyncImpls = {
return;
}
const hFile = await hDir.getFileHandle(filenamePart, {create});
/**
wa-sqlite, at this point, grabs a SyncAccessHandle and
assigns it to the syncHandle prop of the file state
object, but only for certain cases and it's unclear why it
places that limitation on it.
*/
wTimeEnd();
__openFiles[fid] = Object.assign(Object.create(null),{
const fh = Object.assign(Object.create(null),{
fid: fid,
filenameAbs: filename,
filenamePart: filenamePart,
@ -542,8 +552,26 @@ const vfsAsyncImpls = {
sabView: state.sabFileBufView,
readOnly: create
? false : (state.sq3Codes.SQLITE_OPEN_READONLY & flags),
deleteOnClose: deleteOnClose
deleteOnClose: !!(state.sq3Codes.SQLITE_OPEN_DELETEONCLOSE & flags)
});
fh.releaseImplicitLocks =
(opfsFlags & state.opfsFlags.OPFS_UNLOCK_ASAP)
|| state.opfsFlags.defaultUnlockAsap;
if(0 /* this block is modelled after something wa-sqlite
does but it leads to immediate contention on journal files. */
&& (0===(flags & state.sq3Codes.SQLITE_OPEN_MAIN_DB))){
/* sqlite does not lock these files, so go ahead and grab an OPFS
lock.
https://www.sqlite.org/uri.html
*/
fh.xLock = "xOpen"/* Truthy value to keep entry from getting
flagged as auto-locked. String value so
that we can easily distinguish is later
if needed. */;
await getSyncHandle(fh,'xOpen');
}
__openFiles[fid] = fh;
storeAndNotify(opName, 0);
}catch(e){
wTimeEnd();
@ -560,7 +588,7 @@ const vfsAsyncImpls = {
try{
affirmLocked('xRead',fh);
wTimeStart('xRead');
nRead = (await getSyncHandle(fh)).read(
nRead = (await getSyncHandle(fh,'xRead')).read(
fh.sabView.subarray(0, n),
{at: Number(offset64)}
);
@ -575,6 +603,7 @@ const vfsAsyncImpls = {
state.s11n.storeException(1,e);
rc = GetSyncHandleError.convertRc(e,state.sq3Codes.SQLITE_IOERR_READ);
}
await releaseImplicitLock(fh);
storeAndNotify('xRead',rc);
mTimeEnd();
},
@ -603,12 +632,13 @@ const vfsAsyncImpls = {
try{
affirmLocked('xTruncate',fh);
affirmNotRO('xTruncate', fh);
await (await getSyncHandle(fh)).truncate(size);
await (await getSyncHandle(fh,'xTruncate')).truncate(size);
}catch(e){
error("xTruncate():",e,fh);
state.s11n.storeException(2,e);
rc = GetSyncHandleError.convertRc(e,state.sq3Codes.SQLITE_IOERR_TRUNCATE);
}
await releaseImplicitLock(fh);
wTimeEnd();
storeAndNotify('xTruncate',rc);
mTimeEnd();
@ -640,7 +670,7 @@ const vfsAsyncImpls = {
affirmLocked('xWrite',fh);
affirmNotRO('xWrite', fh);
rc = (
n === (await getSyncHandle(fh))
n === (await getSyncHandle(fh,'xWrite'))
.write(fh.sabView.subarray(0, n),
{at: Number(offset64)})
) ? 0 : state.sq3Codes.SQLITE_IOERR_WRITE;
@ -649,6 +679,7 @@ const vfsAsyncImpls = {
state.s11n.storeException(1,e);
rc = GetSyncHandleError.convertRc(e,state.sq3Codes.SQLITE_IOERR_WRITE);
}
await releaseImplicitLock(fh);
wTimeEnd();
storeAndNotify('xWrite',rc);
mTimeEnd();
@ -777,13 +808,13 @@ const waitLoop = async function f(){
to do other things. If this is too high (e.g. 500ms) then
even two workers/tabs can easily run into locking errors.
*/
const waitTime = 150;
const waitTime = 100;
while(!flagAsyncShutdown){
try {
if('timed-out'===Atomics.wait(
state.sabOPView, state.opIds.whichOp, 0, waitTime
)){
await closeAutoLocks();
await releaseImplicitLocks();
continue;
}
const opId = Atomics.load(state.sabOPView, state.opIds.whichOp);
@ -824,6 +855,7 @@ navigator.storage.getDirectory().then(function(d){
state.sabS11nView = new Uint8Array(state.sabIO, state.sabS11nOffset, state.sabS11nSize);
state.opIds = opt.opIds;
state.sq3Codes = opt.sq3Codes;
state.opfsFlags = opt.opfsFlags;
Object.keys(vfsAsyncImpls).forEach((k)=>{
if(!Number.isFinite(state.opIds[k])){
toss("Maintenance required: missing state.opIds[",k,"]");

View File

@ -24,10 +24,13 @@
</p>
<p>
URL flags: pass a number of workers using
the <code>workers=N</code> URL flag and the worker work interval
as <code>interval=N</code> (milliseconds). Enable OPFS VFS
verbosity with <code>verbose=1-3</code> (output goes to the
dev console).
the <code>workers=N</code> URL flag. Set the time between each
workload with <code>interval=N</code> (milliseconds). Set the
number of worker iterations with <code>iterations=N</code>.
Enable OPFS VFS verbosity with <code>verbose=1-3</code> (output
goes to the dev console). Enable/disable "unlock ASAP" mode
(higher concurrency, lower speed)
with <code>unlock-asap=0-1</code>.
</p>
<p>Achtung: if it does not start to do anything within a couple of
seconds, check the dev console: Chrome often fails with "cannot allocate

View File

@ -56,26 +56,42 @@
options.sqlite3Dir = urlArgsJs.get('sqlite3.dir');
options.workerCount = (
urlArgsHtml.has('workers') ? +urlArgsHtml.get('workers') : 3
) || 3;
) || 4;
options.opfsVerbose = (
urlArgsHtml.has('verbose') ? +urlArgsHtml.get('verbose') : 1
) || 1;
options.interval = (
urlArgsHtml.has('interval') ? +urlArgsHtml.get('interval') : 750
) || 750;
) || 1000;
options.iterations = (
urlArgsHtml.has('iterations') ? +urlArgsHtml.get('iterations') : 10
) || 10;
options.unlockAsap = (
urlArgsHtml.has('unlock-asap') ? +urlArgsHtml.get('unlock-asap') : 0
) || 0;
const workers = [];
workers.post = (type,...args)=>{
for(const w of workers) w.postMessage({type, payload:args});
};
workers.loadedCount = 0;
workers.counts = {loaded: 0, passed: 0, failed: 0};
const checkFinished = function(){
if(workers.counts.passed + workers.counts.failed !== workers.length){
return;
}
if(workers.counts.failed>0){
logCss('tests-fail',"Finished with",workers.counts.failed,"failure(s).");
}else{
logCss('tests-pass',"All",workers.length,"workers finished.");
}
};
workers.onmessage = function(msg){
msg = msg.data;
const prefix = 'Worker #'+msg.worker+':';
switch(msg.type){
case 'loaded':
stdout(prefix,"loaded");
if(++workers.loadedCount === workers.length){
stdout("All workers loaded. Telling them to run...");
if(++workers.counts.loaded === workers.length){
stdout("All",workers.length,"workers loaded. Telling them to run...");
workers.post('run');
}
break;
@ -83,21 +99,27 @@
case 'stderr': stderr(prefix,...msg.payload); break;
case 'error': stderr(prefix,"ERROR:",...msg.payload); break;
case 'finished':
++workers.counts.passed;
logCss('tests-pass',prefix,...msg.payload);
checkFinished();
break;
case 'failed':
++workers.counts.failed;
logCss('tests-fail',prefix,"FAILED:",...msg.payload);
checkFinished();
break;
default: logCss('error',"Unhandled message type:",msg); break;
}
};
stdout("Launching",options.workerCount,"workers...");
stdout("Launching",options.workerCount,"workers. Options:",options);
workers.uri = (
'worker.js?'
+ 'sqlite3.dir='+options.sqlite3Dir
+ '&interval='+options.interval
+ '&iterations='+options.iterations
+ '&opfs-verbose='+options.opfsVerbose
+ '&opfs-unlock-asap='+options.unlockAsap
);
for(let i = 0; i < options.workerCount; ++i){
stdout("Launching worker...");

View File

@ -3,9 +3,12 @@ importScripts(
);
self.sqlite3InitModule().then(async function(sqlite3){
const urlArgs = new URL(self.location.href).searchParams;
const wName = urlArgs.get('workerId') || Math.round(Math.random()*10000);
const options = {
workerName: urlArgs.get('workerId') || Math.round(Math.random()*10000),
unlockAsap: urlArgs.get('opfs-unlock-asap') || 0 /*EXPERIMENTAL*/
};
const wPost = (type,...payload)=>{
postMessage({type, worker: wName, payload});
postMessage({type, worker: options.workerName, payload});
};
const stdout = (...args)=>wPost('stdout',...args);
const stderr = (...args)=>wPost('stderr',...args);
@ -43,7 +46,10 @@ self.sqlite3InitModule().then(async function(sqlite3){
}
};
const run = async function(){
db = new sqlite3.opfs.OpfsDb(dbName,'c');
db = new sqlite3.opfs.OpfsDb({
filename: 'file:'+dbName+'?opfs-unlock-asap='+options.unlockAsap,
flags: 'c'
});
sqlite3.capi.sqlite3_busy_timeout(db.pointer, 5000);
db.transaction((db)=>{
db.exec([
@ -52,7 +58,8 @@ self.sqlite3InitModule().then(async function(sqlite3){
]);
});
const maxIterations = 10;
const maxIterations =
urlArgs.has('iterations') ? (+urlArgs.get('iterations') || 10) : 10;
stdout("Starting interval-based db updates with delay of",interval.delay,"ms.");
const doWork = async ()=>{
const tm = new Date().getTime();
@ -62,7 +69,7 @@ self.sqlite3InitModule().then(async function(sqlite3){
try{
db.exec({
sql:"INSERT OR REPLACE INTO t1(w,v) VALUES(?,?)",
bind: [wName, new Date().getTime()]
bind: [options.workerName, new Date().getTime()]
});
//stdout("Set",prefix);
}catch(e){

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@ -1,5 +1,5 @@
C Relax\srestriction\s(8)\son\sthe\spush-down\soptimization\sso\sthat\sit\sonly\sapplies\nif\sone\sor\smore\scolumns\suses\sa\scollating\ssequence\sother\sthan\sBINARY.\nSee\s[forum:/forumpost/3824ced748baa808|forum\spost\s3824ced748baa808]\sand\ncheck-in\s[346a3b12b861ce7b].
D 2022-11-25T17:05:55.692
C OPFS\sVFS:\sadd\sthe\sopfs-unlock-asap=1\sURI\sflag\swhich\stells\sthe\sVFS\sto\srelease\simplicit\slocks\sASAP\sinstead\sof\sduring\sVFS\sidle\stime.\sThis\simproves\sconcurrency\snotably\sin\sthe\stest\sapp\sbut\sbrings\sa\ssignificant\sperformance\spenalty\sin\sspeedtest1\s(roughly\s4x\sslowdown).\sThis\sis\snot\sthe\sfinal\sword\sin\sOPFS\sconcurrency,\sbut\sgets\sus\sa\sstep\sfurther.
D 2022-11-26T15:24:58.092
F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@ -501,12 +501,12 @@ F ext/wasm/api/post-js-header.js d6ab3dfef4a06960d28a7eaa338d4e2a1a5981e9b387181
F ext/wasm/api/pre-js.js b88499dc303c21fc3f55f2c364a0f814f587b60a95784303881169f9e91c1d5f
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F ext/wasm/api/sqlite3-api-oo1.js dec6c14994317ad0011714890426cdc211f4eab451c9766ea88c7ac4f535287e
F ext/wasm/api/sqlite3-api-opfs.js 38d368e33f470f9ba196f1a2b0c9ce076c930c70df233c345a246f1ad4c26d3b
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F ext/wasm/api/sqlite3-api-opfs.js e98a8bd67dea8c20b0ec17332698b44658a6fbc4be18dd87fab2ce05284a10d7
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F ext/wasm/api/sqlite3-api-worker1.js e94ba98e44afccfa482874cd9acb325883ade50ed1f9f9526beb9de1711f182f
F ext/wasm/api/sqlite3-license-version-header.js a661182fc93fc2cf212dfd0b987f8e138a3ac98f850b1112e29b5fbdaecc87c3
F ext/wasm/api/sqlite3-opfs-async-proxy.js 1ec10873f1d59d305f6f3b435c50a1b75d693d5fb739b226f3da46fcbb11261a
F ext/wasm/api/sqlite3-opfs-async-proxy.js d933d4a3c84e6dc614b57355fc9029645cfcdfbfde096ed42f4c979a6f60c18a
F ext/wasm/api/sqlite3-wasi.h 25356084cfe0d40458a902afb465df8c21fc4152c1d0a59b563a3fba59a068f9
F ext/wasm/api/sqlite3-wasm.c 8b32787a3b6bb2990cbaba2304bd5b75a9652acbc8d29909b3279019b6cbaef5
F ext/wasm/api/sqlite3-worker1-promiser.js 0c7a9826dbf82a5ed4e4f7bf7816e825a52aff253afbf3350431f5773faf0e4b
@ -552,9 +552,9 @@ F ext/wasm/test-opfs-vfs.js 44363db07b2a20e73b0eb1808de4400ca71b703af718d0fa6d96
F ext/wasm/tester1-worker.html 5ef353348c37cf2e4fd0b23da562d3275523e036260b510734e9a3239ba8c987
F ext/wasm/tester1.c-pp.html 74aa9b31c75f12490653f814b53c3dd39f40cd3f70d6a53a716f4e8587107399
F ext/wasm/tester1.c-pp.js 3b91f192c159088004fba6fe3441edea58421a8b88bccf3dd20978a077648d19
F ext/wasm/tests/opfs/concurrency/index.html bb9b0f6da86df34c67fa506db9c45b7c4cf0045a211611cc6b8d2b53fa983481
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# Remove this line to create a well-formed Fossil manifest.

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