![]() ![]() ![]() Globals are modified regularly and property access optimizations do a good job for non-global objects aren't applicable for globals. Intermediate objects exist for performance. This contrasts with the norm, where objects directly reference each other. If an object is created using a constructor Person and is held by a global object, the retaining path would be represented as > (global property) > Person. The intermediate objects between a global object (like window) and an object referenced by it. The various constructor (group) entries in the heap profiler correspond to the following types of objects. A detached node is referenced from a node that has a yellow background.Ĭonstructor (group) entries in the heap profiler Yellow objects have JavaScript references.The number after the character is the unique ID of the object, allowing you to compare heap snapshots on per-object basis. For each instance, the shallow and retained sizes are displayed in the corresponding columns. See Object sizes.Īfter expanding a total line in the upper view, all of the instances are displayed. The size of memory that you can free after an object is deleted (and the dependents are made no longer reachable) is called the retained size. See Object sizes.ĭisplays the maximum retained size among the same set of objects. The shallow size is the size of memory held by an object (generally, arrays and strings have larger shallow sizes). Represents all objects created using this constructor.ĭisplays the distance to the root using the shortest simple path of nodes.ĭisplays the sum of shallow sizes of all objects created by a certain constructor function. Initially, a snapshot opens in the Summary view, displaying object totals, which can be expanded to show instances: Also, non-string values such as numbers aren't captured. Properties implemented using getters that run native code aren't captured. Not all properties are stored on the JavaScript heap. To switch between views, use the selector at the top of the view. Use it to analyze closures and dive into your objects at a low level. Containment view provides a better view of object structure, helping analyze objects referenced in the global namespace (window) to find out what is keeping objects around. Inspecting the delta in freed memory and reference count lets you confirm the presence and cause of a memory leak.Ĭontainment view. Use it to compare two (or more) memory snapshots from before and after an operation. Displays the difference between two snapshots. Summary view is particularly helpful for tracking down DOM leaks.Ĭomparison view. Use it to hunt down objects (and the memory use) based on type grouped by constructor name. Summary view shows objects grouped by the constructor name. View snapshots from different perspectives for different tasks. A number of (object) item allocations are displayed. Open this demo example webpage: Example 3: Scattered objects in a new window or tab.Demo webpage: Example 3: Scattered objects When reopening DevTools, all previously taken snapshots reappear in the list of snapshots. Clear snapshotsĬlick the Clear all profiles icon to remove snapshots (both from DevTools and any memory associated with the renderer process).Ĭlosing the DevTools window doesn't delete profiles from the memory associated with the renderer process. ![]() Also, taking a snapshot always starts with a garbage collection. Only reachable objects are included in snapshots. ![]()
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