| author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
| Mon, 04 Oct 2010 01:32:07 +0300 | |
| changeset 2 | 303757a437d3 |
| parent 0 | 4f2f89ce4247 |
| permissions | -rw-r--r-- |
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4f2f89ce4247
Revision: 201037
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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<html> |
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<head> |
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<script> |
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function log(m) {
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document.getElementById("log").innerHTML += m + "<br>";
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} |
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var multiplyFactor = 2; // Create this many timers in every timer callback. |
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var targetLatency = 10000; // Multiply timers until it takes this much to fire all their callbacks. |
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var timerCount = 1; |
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function timerCallback(creationTimestamp) {
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--timerCount; |
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if (!multiplyFactor) {
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if (timerCount == 0) |
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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log("No more timers - UI should be responsive now.");
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return; |
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} |
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// Create more timers. Capture the current time so when callbacks are fired, |
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// we can check how long it actually took (latency caused by a long timer queue). |
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var timestamp = new Date().getTime(); |
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for (i = 0; i < multiplyFactor; ++i) {
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setTimeout(function() { timerCallback(timestamp); }, 0);
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++timerCount; |
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} |
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// Once the timer queue gets long enough for the timer firing latency to be over the limit, |
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// stop multplying them and keep the number of timers constant. |
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Revision: 201037
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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if (multiplyFactor > 1 && new Date().getTime() - creationTimestamp > targetLatency) |
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multiplyFactor = 1; |
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} |
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function runTest() {
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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log("Freezing UI...");
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setTimeout(function() { timerCallback(new Date().getTime()); }, 0);
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Revision: 201037
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setTimeout("multiplyFactor = 0; log('Finishing. Started to drain timers.');", 10000);
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} |
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Revision: 201037
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</script> |
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Revision: 201037
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</head> |
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Revision: 201037
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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<body onload="runTest()"> |
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Revision: 201037
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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This test will create enough timers to freeze browser UI. After 10 seconds, it |
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will start drain the timers so the UI becomes responsive again in a few seconds. |
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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You don't need to kill the browser.<br>If the bug is fixed, there will be no |
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UI freeze. Refresh the page to repeat the experiment.<br>Try to click at this |
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button (or browser's menu) while UI is frozen: <button onclick="log('clicked')">Click Me</button> <hr>
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<div id="log"></div> |
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</body> |
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Revision: 201037
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</html> |