What does the Jetsam really do?

Question

In a question I asked a few months ago, I asked if it was possible to observe the effect of Jetsam on memory usage. I answered my question using the tools, finding that the applications killed by Jetsam still had the same amount of memory that they had before they were terminated.

Even today, I still see applications reset on the screen in the current taskbar of the recently used list of applications. I have no performance improvement unless I delete them myself, even after the Jetsam killed them.

If so, what is the purpose of Jetsam and what does it do (other than killing applications)? I do not see any advantages. This is mistake?

Answer 1

Even today, I still see dropped applications in the running taskbar. I have no performance improvement unless I delete them myself, even after the Jetsam killed them.

bullshit. There is no such thing as a "taskbar". You are thinking of a list of recently used applications. The presence of an application in this bar does not mean that the application is still running, and removing killed applications from this line does not affect performance / memory. The only thing that removes the application from this bar, which is beneficial, is to kill the application if it still works.

As for jetsammed-enabled applications, it is not surprising that after rebooting the application will have the same amount of memory. Applications are usually jetsammed because they are paused and the front application needs more memory. The fact that the jetsammed application does not indicate that the application is necessarily using an invalid amount of memory.

Answer 2

As it turns out, when the program leaves the field, it goes into a "paused" state. Then the OS will save memory for this application until the OS needs it for something else, so that the program loads faster.

Jettison works the same way: it's FREES UP memory ..., which is different from CLEARING.

The important difference is that the memory remains unchanged when it is discarded until the OS uses it for something else. Clearing is the same ... except that you delete the contents in addition to freeing up memory.