about memory release

I have lots pages from server, When I load grid's data again and again, how can I release memory?

data=null?
grid.on... = null?
grid=null?

...?

Killee

October 18,

Why do you think that there is a memory problem? If you are replacing data in a JavaScript array, the browser handles the memory and there isn't much you can do except possibly set the array to null prior to assigning more info to it. Are you creating new grids every time?

Jim Hunter

October 18,

Yes, I create two grids every time. It's a dynamic UI. And I found there are some memory leak in IE6.

Killee

October 18,

My entire application is dynamic and I never reload the page and I ran a test that created/destroyed thousands of grids and I saw no noticeable memory issues in IE6.0 other then the ones that are inherant already. How are you 'reloading' the data? Show me some source code on how you are doing it.

Jim Hunter

October 19,

<html>
<head>
    <script src="../../runtime/lib/aw.js"></script>
    <link href="../../runtime/styles/xp/aw.css" rel="stylesheet"></link>
</head>
<body>

<script>
var grid = function()
{
};
grid.prototype.create = function()
{
//data	
    this.data = this.getData();
    this.headers = this.getHeaders();

    this.obj = new AW.UI.Grid;

    this.obj.setId("myGrid"+Math.random());
    this.obj.setVirtualMode(false);
    this.obj.setControlSize(600, 300);
    
    this.obj.setColumnCount(this.headers.length);
    this.obj.setHeaderText(this.headers);
    
    this.obj.setRowCount(this.data.length);
    this.obj.setCellText(this.data);

    this.obj.setSelectorVisible(true);
    this.obj.setSelectorText(function(i){return this.getRowPosition(i)+1});

    return this.obj.toString();
};
grid.prototype.dispose = function()
{
    this.data = null;
    this.headers = null;
    this.obj = null;
}
grid.prototype.getData = function()
{
    var array =
        [
        ["MSFT","Microsoft Corporation", "314,571.156", "32,187.000", "55000","MSFT","Microsoft Corporation", "314,571.156", "32,187.000", "55000"],
        ["ORCL", "Oracle Corporation", "62,615.266", "9,519.000", "40650","ORCL", "Oracle Corporation", "62,615.266", "9,519.000", "40650"],
        ["SAP", "SAP AG (ADR)", "40,986.328", "8,296.420", "28961","SAP", "SAP AG (ADR)", "40,986.328", "8,296.420", "28961"],
        ["CA", "Computer Associates Inter", "15,606.335", "3,164.000", "16000","CA", "Computer Associates Inter", "15,606.335", "3,164.000", "16000"],
        ["ERTS", "Electronic Arts Inc.", "14,490.895", "2,503.727", "4000","ERTS", "Electronic Arts Inc.", "14,490.895", "2,503.727", "4000"],
        ["SFTBF", "Softbank Corp. (ADR)", "14,485.840", ".000", "6865","SFTBF", "Softbank Corp. (ADR)", "14,485.840", ".000", "6865"],
        ["VRTS", "Veritas Software Corp.", "14,444.272", "1,578.658", "5647","VRTS", "Veritas Software Corp.", "14,444.272", "1,578.658", "5647"],
        ["SYMC", "Symantec Corporation", "9,932.483", "1,482.029", "4300","SYMC", "Symantec Corporation", "9,932.483", "1,482.029", "4300"],
        ["INFY", "Infosys Technologies Ltd.", "9,763.851", "830.748", "15400","INFY", "Infosys Technologies Ltd.", "9,763.851", "830.748", "15400"],
        ["INTU", "Intuit Inc.", "9,702.477", "1,650.743", "6700","INTU", "Intuit Inc.", "9,702.477", "1,650.743", "6700"],
        ["ADBE", "Adobe Systems Incorporate", "9,533.050", "1,230.817", "3341","ADBE", "Adobe Systems Incorporate", "9,533.050", "1,230.817", "3341"],
        ["PSFT", "PeopleSoft, Inc.", "8,246.467", "1,941.167", "8180", "PSFT", "PeopleSoft, Inc.", "8,246.467", "1,941.167", "8180"],
        ["SEBL", "Siebel Systems, Inc.", "5,434.649", "1,417.952", "5909", "SEBL", "Siebel Systems, Inc.", "5,434.649", "1,417.952", "5909"],
        ["BEAS", "BEA Systems, Inc.", "5,111.813", "965.694", "3063", "BEAS", "BEA Systems, Inc.", "5,111.813", "965.694", "3063"],
        ["SNPS", "Synopsys, Inc.", "4,482.535", "1,169.786", "4254", "SNPS", "Synopsys, Inc.", "4,482.535", "1,169.786", "4254"],
        ["CHKP", "Check Point Software Tech", "4,396.853", "424.769", "1203", "CHKP", "Check Point Software Tech", "4,396.853", "424.769", "1203"],
        ["MERQ", "Mercury Interactive Corp.", "4,325.488", "444.063", "1822", "MERQ", "Mercury Interactive Corp.", "4,325.488", "444.063", "1822"],
        ["DOX", "Amdocs Limited", "4,288.017", "1,427.088", "9400", "DOX", "Amdocs Limited", "4,288.017", "1,427.088", "9400"],
        ["CTXS", "Citrix Systems, Inc.", "3,946.485", "554.222", "1670", "CTXS", "Citrix Systems, Inc.", "3,946.485", "554.222", "1670"],
        ["KNM", "Konami Corporation (ADR)", "3,710.784", ".000", "4313", "KNM", "Konami Corporation (ADR)", "3,710.784", ".000", "4313"],
        ["MSFT","Microsoft Corporation", "314,571.156", "32,187.000", "55000","MSFT","Microsoft Corporation", "314,571.156", "32,187.000", "55000"],
        ["ORCL", "Oracle Corporation", "62,615.266", "9,519.000", "40650","ORCL", "Oracle Corporation", "62,615.266", "9,519.000", "40650"],
        ["SAP", "SAP AG (ADR)", "40,986.328", "8,296.420", "28961","SAP", "SAP AG (ADR)", "40,986.328", "8,296.420", "28961"],
        ["CA", "Computer Associates Inter", "15,606.335", "3,164.000", "16000","CA", "Computer Associates Inter", "15,606.335", "3,164.000", "16000"],
        ["ERTS", "Electronic Arts Inc.", "14,490.895", "2,503.727", "4000","ERTS", "Electronic Arts Inc.", "14,490.895", "2,503.727", "4000"],
        ["SFTBF", "Softbank Corp. (ADR)", "14,485.840", ".000", "6865","SFTBF", "Softbank Corp. (ADR)", "14,485.840", ".000", "6865"],
        ["VRTS", "Veritas Software Corp.", "14,444.272", "1,578.658", "5647","VRTS", "Veritas Software Corp.", "14,444.272", "1,578.658", "5647"],
        ["SYMC", "Symantec Corporation", "9,932.483", "1,482.029", "4300","SYMC", "Symantec Corporation", "9,932.483", "1,482.029", "4300"],
        ["INFY", "Infosys Technologies Ltd.", "9,763.851", "830.748", "15400","INFY", "Infosys Technologies Ltd.", "9,763.851", "830.748", "15400"],
        ["INTU", "Intuit Inc.", "9,702.477", "1,650.743", "6700","INTU", "Intuit Inc.", "9,702.477", "1,650.743", "6700"],
        ["ADBE", "Adobe Systems Incorporate", "9,533.050", "1,230.817", "3341","ADBE", "Adobe Systems Incorporate", "9,533.050", "1,230.817", "3341"],
        ["PSFT", "PeopleSoft, Inc.", "8,246.467", "1,941.167", "8180", "PSFT", "PeopleSoft, Inc.", "8,246.467", "1,941.167", "8180"],
        ["SEBL", "Siebel Systems, Inc.", "5,434.649", "1,417.952", "5909", "SEBL", "Siebel Systems, Inc.", "5,434.649", "1,417.952", "5909"],
        ["BEAS", "BEA Systems, Inc.", "5,111.813", "965.694", "3063", "BEAS", "BEA Systems, Inc.", "5,111.813", "965.694", "3063"],
        ["SNPS", "Synopsys, Inc.", "4,482.535", "1,169.786", "4254", "SNPS", "Synopsys, Inc.", "4,482.535", "1,169.786", "4254"],
        ["CHKP", "Check Point Software Tech", "4,396.853", "424.769", "1203", "CHKP", "Check Point Software Tech", "4,396.853", "424.769", "1203"],
        ["MERQ", "Mercury Interactive Corp.", "4,325.488", "444.063", "1822", "MERQ", "Mercury Interactive Corp.", "4,325.488", "444.063", "1822"],
        ["DOX", "Amdocs Limited", "4,288.017", "1,427.088", "9400", "DOX", "Amdocs Limited", "4,288.017", "1,427.088", "9400"],
        ["CTXS", "Citrix Systems, Inc.", "3,946.485", "554.222", "1670", "CTXS", "Citrix Systems, Inc.", "3,946.485", "554.222", "1670"],
        ["KNM", "Konami Corporation (ADR)", "3,710.784", ".000", "4313", "KNM", "Konami Corporation (ADR)", "3,710.784", ".000", "4313"]		
    ];
  return array;
};
grid.prototype.getHeaders = function()
{
    var a = ["Ticker", "Company Name", "Market Cap.", "$ Sales", "Employees", "Ticker", "Company Name", "Market Cap.", "$ Sales", "Employees"];
    return a;
}
</script>
<div id="container" style="width:602px; height:302px; border: solid 1px black;">

</div>

<div id="time">time:</div>

<script>

    var button = new AW.UI.Button;
    button.setControlText("100 times");
    document.write(button);
    button.onClick = function(){
        var div;
        var gridIns ;
        div = document.getElementById("container");

        for(var i=0; i< 100; ++i)
        {
            gridIns = new grid();
            div.innerHTML = gridIns.create();
            gridIns.dispose();
            div.innerHTML = "";
        }
    
        gridIns=null;
        div = null;
        
        alert("ok");
    }

    var button2 = new AW.UI.Button;
    button2.setControlText("create one");
    document.write(button2);
    button2.onClick = function(){
        var t1=new Date()
        
        var div;
        var gridIns ;
        div = document.getElementById("container");
        
        gridIns = new grid();
        div.innerHTML = gridIns.create();
        gridIns.dispose();
        gridIns=null;
        div = null;
        
        document.getElementById("time").innerHTML = "time:"+(new Date() - t1);
    }

    var button3 = new AW.UI.Button;
    button3.setControlText("delete one");
    document.write(button3);
    button3.onClick = function(){
        var div;
        div = document.getElementById("container");
        div.innerHTML = "";
        div = null;
    }
</script>
</body>
</html>

OK, Jim, try it

October 20,

I feel you test is completely skewed. I ran it just like you have and saw a 40 meg leak when I ran the 100 times test once. I then went in and looked at your code and did not like what I saw. Why are you trying to destroy the grid each time when your post is claiming a memory leak when reloading data? So I changed the code to not create the grid over and over, just clear and re-load the data. Then I also desctroyed the temporary data array you are creating in your getData function and low and behold, the 'leak' almost went away. I think that if you simplify your code and simply create a single grid, re-use the same data array (don't keep creating it over and over), and clear/re-load the data only durring your itteration, you will find that the grid performs quite nice.
When doing testing like you are here, start simple and test just the thing you want to test. What showed up in your test, that you assumed were grid data issues, were IE issues and JavaScript issues. I suggest starting over with your test, keep it simple, and you will see how much more reliable the grid is then you think.

Jim Hunter

October 21,

That's just a very simple sample to show the "leak".

destroy and create a new grid in some app is necessary.

AW's code need handle it<destroy and create grid again and again>, I think.

To Alex

October 22,

Yes, this is a bug. In 2.0b1 memory for AW objects is not released. I'll try to fix it for beta2.

Alex (ActiveWidgets)

October 24,

This topic is archived.

about memory release

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