On my Mavericks 10.9.4 instance of mdflagwriter eats up 2.18G of RAM. I know that it's somehow related to Spotlight, but what is it exactly and why is it so RAM-hungry?

  • I got this process running after I downloaded Raw Images of Mars from NASA site. Every time I use this images to a closest magnification or if I mark it with arrow, I can see how much difference it makes in my CPU monitor.
    – Kate
    Apr 5, 2018 at 13:40

1 Answer 1


/System/Library/Frameworks/CoreServices.framework/Frameworks/Metadata.framework/Versions/A/Support/mdflagwriter is part of Spotlight's indexing. There seems to be a bug present for some people where mdflagwriter uses a considerable amount of RAM, but no canonical fix, apart from reinstalling OS X, or for some people reindexing with sudo mdutil -E /.

  • Thanks. Well, reinstalling is not an option, luckily I have 32G RAM, so I'll just leave it at what it is, will try to reindex stuff as well.
    – favoretti
    Aug 24, 2014 at 10:11

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