8 Replies Latest reply: Jan 22, 2013 9:38 AM by Matt Kimmel
Matt Kimmel Level 1 Level 1 (5 points)

Hi everyone,

 

I have an SSD (used as the system disk) in my iMac, and after noticing that its lifespan (according to S.M.A.R.T.) has ticked down a bit, I started looking at what's writing to the system disk, using iostat, iotop, and fs_usage.

 

What I discovered is that, even though I have Resume turned off (by checking "Close windows when quitting an application"), Mountain Lion is still writing huge amounts of data to the *savedState folders in ~/Library/Saved Application State, for each application I have open. The only difference with Resume turned off is that it removes the *savedState folder for each app when I quit that app.

 

Since I use this iMac for work, I typically have quite a few applications open for long periods of time. According to iostat, this is causing over 1 gigabyte of data per hour to be written to savedState. That's 10-12GB in a typical day, not including data I actually write to the drive as I work! Needless to say, this is hammering my SSD and is probably what is decreasing its lifetime.

 

I've spent a couple of hours googling this problem, and though I've found lots of ways to turn off Resume both globally and per-application, none of them prevent Mountain Lion from continuing to write all this Resume data to the *savedData folders. Does anyone know how to completely turn off Resume and stop all this unnecessary disk I/O?

 

Thanks!


iMac, OS X Mountain Lion (10.8.2), 2012 iMac 27", 3.4GHz