Once the recording has finished, the Summary view shows current objects in-memory, grouped by constructor. To record a heap snapshot, head over to the Memory tab in Chrome DevTools and select Heap Snapshot in the list of available profiling types. A heap snapshot showing the references that retain a large object. Heap snapshots contain useful information about objects, including their size and a list of the variables and closures that reference them. This provides a point-in-time view into the memory currently used by an application - all the objects that have been created but not yet garbage-collected. To that end, it's useful to start with tools that specifically avoid introducing this possibility.Ī great place to start debugging memory problems is to take a heap snapshot. To make things more complicated, inspecting potential leaked references can end up creating additional references that prevent the inspected objects from being garbage collected.
#ELECTRON MEMORY MONITOR WINDOWS#
It is often difficult to construct isolated reproductions of these issues, particularly when multiple documents or windows are involved. Tracking down memory leaks can be tricky. Detecting memory leaks caused by detached windows # This means it's just as important to avoid holding references to objects from other windows as it is to avoid holding references to the windows themselves. When passing a JavaScript object to another window or iframe, the Object's prototype chain includes references to the environment it was created in, including the window that created it. This is often caused by the parent page retaining references to the document in order to allow for listener removal.
#ELECTRON MEMORY MONITOR HOW TO#
See Solution: communicate over postMessage to learn how to fix this particular memory leak. Illustration of how references to a window prevent it from being garbage collected once closed. The nextSlide() function is still "live" because it is bound as a click handler in our main page, and the fact that nextSlide contains a reference to notesWindow means the window is still referenced and can't be garbage collected.
#ELECTRON MEMORY MONITOR CODE#
There's no event handler listening to detect that the window has been closed, so nothing is informing our code that it should clean up any references to the document. Imagine we close the browser window created by showNotes() above.
This works even when objects reference themselves, or cyclically reference each other–once there are no remaining references through which an application could access a group of objects, it can be garbage collected.
The job of the garbage collector is to identify and reclaim objects that are no longer reachable from the application. These references prevent the unneeded objects from being reclaimed by the garbage collector. In JavaScript, memory leaks happen when objects are no longer needed, but are still referenced by functions or other objects.
0 kommentar(er)
