When encountering memory leak problems, Chrome developer tools can be positioned through the following methods: 1. Use the Performance panel to record the operation process and observe whether the memory curve has not fallen back, and analyze the leaked code in combination with the function call stack; 2. Select the appropriate mode in the Memory panel to view the growth of the object, and analyze the reference chain through the retention tree; 3. Check whether the event listener and closure cause reference retention, and find abnormal references in the Elements panel or snapshot; 4. Take multiple memory snapshots to compare differences, focusing on newly added and unreleased objects to narrow the scope of the troubleshooting.
When encountering memory leaks, Chrome developer tools have actually provided many practical functions to help us locate the source. The key is to know where to look and how to operate.
1. Use the Performance panel to record the run process
When you suspect that an operation has caused a memory leak, you can first open the Performance panel of Chrome DevTools, check the "Memory" option, and then record the complete user operation process (such as clicking a button multiple times or switching pages).
In the result you will see a blue memory curve, and if the memory does not fall back to the initial level after each operation, there is a very likely leak. At this time, you can also see the specific function call stack to see which piece of code frequently allocates memory but is not released.
2. View object retention through the Memory panel
Enter the Memory panel and select "Allocation instrumentation on timeline" or "Allocation sampling" mode to record. The former is more accurate but has a greater impact on performance, and is suitable for small-scale inspections; the latter is more suitable for long-term monitoring.
After the operation is complete, look for those object types that continue to grow in the snapshot, especially your own class or module name. Click in to see the retaining tree of these objects and find who referenced them and could not be garbage collected.
3. Check whether the event listener and closure cause reference retention
Many memory leaks are caused by unbinding event listeners or closures that hold external scope variables . you can:
- Select the DOM element in the Elements panel and expand Event Listeners to see if there are any unanswered listeners left
- Search for relevant function names in Memory snapshots to see if multiple instances are accidentally preserved by closures
Common scenarios include: the event was not removed when component uninstallation, the component status is referenced in setTimeout, and the third-party library cache is not cleaned.
4. Multiple operations to compare snapshot differences
Use the "Take snapshot" function in the Memory panel to take multiple snapshots before and after the operation, and select "Objects allocated between snapshots" to view newly added and surviving objects in the middle.
This step can help you filter out the content loaded at once and focus on the really leaked parts. Focus on constructor instances or Map/Set structures that should have been released but still exist.
Basically these methods. Memory leak investigation sometimes seems complicated, but in fact it depends on narrowing the scope step by step and judging the reference relationship with the code logic. As long as you are familiar with the operation of the tool, most problems can be clearly located.
The above is the detailed content of How to find the source of a memory leak in Chrome. For more information, please follow other related articles on the PHP Chinese website!
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