Attachment 359291 Details for Bug 193504 – leak demonstration

leak demonstration

Leak Demo with openCursor().html (text/html), 1.79 KB, created by zac spitzer on 2019-01-16 12:21:49 PST

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Creator: zac spitzer

Created: 2019-01-16 12:21:49 PST

Size: 1.79 KB

patch

obsolete

>
><!DOCTYPE html>
><title>Leak Demo with openCursor()</title>
>open the web inspector and reload, then checkout the timelines tab, there's an 85 MB leak
><script>
>var DBNAME = 'cursor_leak';
>var VERSION = '1';
>var STORE = "dummy";
>var db;
>var str = "i am a test string";
>
>self.onload = function () {
>  	indexedDB.deleteDatabase(DBNAME);
>  	var request = indexedDB.open(DBNAME, VERSION);
>
>  	request.onupgradeneeded = function(event) {
>		db = event.target.result;
>  	// Create a new object store if this is the first time we're using
>  	// this DB_NAME/DB_VERSION combo.
>  		db.createObjectStore(STORE, {autoIncrement: true});
>	};
>	request.onerror = function(err){
>		console.error(err);
>	};
>
>	request.onsuccess = function (event) {
>		db = request.result;
>		prepTest(db);
>	};
>};
>function prepTest(db){
>	var trans = db.transaction(STORE, "readwrite");
>	var store = trans.objectStore(STORE);
>	// lets insert a large object
>	store.put({
>		a: str.repeat(5000000),
>		b: str.repeat(5000000)
>	});
>
>	trans.oncomplete = function(){
>		runtest(db);
>	};
>}
>
>function cb(result){
>	if (console.takeHeapSnapshot)
>        console.takeHeapSnapshot("result");
>	console.log(result);
>}
>
>function runtest(db) {
>	var objectStore = db.transaction(STORE).objectStore(STORE);
>	var toReturn = [];
>	objectStore.openCursor().onsuccess = function(event) {
>		//var cursor = event.target.result;
>		if (event.target.result) {
>			toReturn.push(event.target.result.value);
>			event.target.result['continue']();
>		} else {
>			if (cb)
>				cb(toReturn);
>		}
>	};
>
>	if (self.gc) {
>		self.gc();
>		console.info("gc");
>	}
>  done();
>}
>
>function done() {
>  setTimeout(
>    function() {
>      if (self.gc) {
>        console.error("forcing GC");
>        self.gc();
>      }
>    },
>    2000
>  );
>}
>
></script>

<!DOCTYPE html>
<title>Leak Demo with openCursor()</title>
open the web inspector and reload, then checkout the timelines tab, there's an 85 MB leak
<script>
var DBNAME = 'cursor_leak';
var VERSION = '1';
var STORE = "dummy";
var db;
var str = "i am a test string";

self.onload = function () {
  	indexedDB.deleteDatabase(DBNAME);
  	var request = indexedDB.open(DBNAME, VERSION);

  	request.onupgradeneeded = function(event) {
		db = event.target.result;
  	// Create a new object store if this is the first time we're using
  	// this DB_NAME/DB_VERSION combo.
  		db.createObjectStore(STORE, {autoIncrement: true});
	};
	request.onerror = function(err){
		console.error(err);
	};

	request.onsuccess = function (event) {
		db = request.result;
		prepTest(db);
	};
};
function prepTest(db){
	var trans = db.transaction(STORE, "readwrite");
	var store = trans.objectStore(STORE);
	// lets insert a large object
	store.put({
		a: str.repeat(5000000),
		b: str.repeat(5000000)
	});

	trans.oncomplete = function(){
		runtest(db);
	};
}

function cb(result){
	if (console.takeHeapSnapshot)
        console.takeHeapSnapshot("result");
	console.log(result);
}

function runtest(db) {
	var objectStore = db.transaction(STORE).objectStore(STORE);
	var toReturn = [];
	objectStore.openCursor().onsuccess = function(event) {
		//var cursor = event.target.result;
		if (event.target.result) {
			toReturn.push(event.target.result.value);
			event.target.result['continue']();
		} else {
			if (cb)
				cb(toReturn);
		}
	};

	if (self.gc) {
		self.gc();
		console.info("gc");
	}
  done();
}

function done() {
  setTimeout(
    function() {
      if (self.gc) {
        console.error("forcing GC");
        self.gc();
      }
    },
    2000
  );
}

</script>

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Attachments on bug 193504: 359291