![]() I do lots of work that is heavy on RAM usages. I currently have a 2010 13" MacBook Pro that has 16GB of RAM. I really would not be worrying about this unless you see that the Activity Monitor is reporting that Memory Pressure is in the Yellow or Red zone. Mac OS X (and most modern OS: Windows, Linux, etc) are very intelligent about automatically using Cache, Swap, memory compression and other techniques to keep the system running as fast as possible. Then the backup program released its RAM and went back to sleep. Or your backup program briefly ran in the background, and did a huge number of file checksums and comparisons and created large RAM based data structures, pushing other content to swap. The OS could see that there was suddenly a huge new demand on RAM, and moved some unused RAM content to swap in advanced of an expected need. For example, maybe you started up Photoshop which had several large image files automatically reopen from a prior session. The OS can move to swap based on predictive measures. Based on what you describe in text and in the screen shot, I see nothing that is concerning.Īs to why swap was created when you assume you had free RAM. You would need to be monitoring the memory and swap usage as the swap file was created to have a chance to understand why the swap was created.
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