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Taz Mangus

macrumors 604
Mar 10, 2011
7,815
3,504
I updated my MBP Sunday to Yosemite and my ram (8G) was using all of it except 500mb. I called apple and this is what solved my problem.

1. Turn your device completely off.

2. Turn it back on and after hitting the power button hold down the shift key while it opens into safe mode.

3. While in safe mode look at your activity monitor. Your ram should be working normal. Opening your device in safe mode turns off what ever was using most of your ram.

This fixed my late 2013 MBP 15". I am now using 5.30 GB of ram as I type this. Before I was using 7.5 GB.

Good luck.

Interesting. https://support.apple.com/en-us/HT201262. I wonder if this had anything to do with the font cache getting cleaned out or repairing any directory issues.
 

bigchief

macrumors 6502a
Feb 26, 2009
902
180
Interesting. https://support.apple.com/en-us/HT201262. I wonder if this had anything to do with the font cache getting cleaned out or repairing any directory issues.

The person I talked to said that if any thing was using ram that shouldn't would stop using ram when I opened up in safe mode. I'm not tech savvy but it worked for me. AS I type this I'm using 4.2 GB ram before I called I was using 7.5 GB of ram.

I'll have to say this for apple. The 3 times I have asked for their assistance from their website it has taken less than 30 seconds for them to call me. That's Amazing to me in this day and time.
 

Taz Mangus

macrumors 604
Mar 10, 2011
7,815
3,504
The person I talked to said that if any thing was using ram that shouldn't would stop using ram when I opened up in safe mode. I'm not tech savvy but it worked for me. AS I type this I'm using 4.2 GB ram before I called I was using 7.5 GB of ram.

I'll have to say this for apple. The 3 times I have asked for their assistance from their website it has taken less than 30 seconds for them to call me. That's Amazing to me in this day and time.

Apple has always been helpful when I have called them. I would be interested in how well Yosemite is doing for you in the next weeks and months. Please report back.
 

simonsi

Contributor
Jan 3, 2014
4,851
735
Auckland
The person I talked to said that if any thing was using ram that shouldn't would stop using ram when I opened up in safe mode. I'm not tech savvy but it worked for me. AS I type this I'm using 4.2 GB ram before I called I was using 7.5 GB of ram.

This is correct, but not for the reason you or the Apple tech think.

When you boot into safe mode a lot of stuff doesn't run, and you are doing a fresh start. Much of Yosemite's RAM management is to cache what you have used and closed (say an app using 2GB), in case you decide to re-open it. If since the last boot you haven't used that app, Yosemite won't have loaded it and won't be caching it (Yosemite doesn't have ESP to know what you are going to use, only what you have used).

Now, using that 2GB as now cached RAM, in case you want to reopen it isn't a problem, Yosemite will only keep that 2GB of RAM allocated (and loaded with the App), as long as Yosemite doesn't have a better use for that RAM space, as soon as it does, say you want to load a different App, Yosemite frees up that 2GB and the new App can then use it.

So the fact that 7.5GB of your RAM was "in use", isn't a problem and isn't quite true in the old meaning of "in use".

When you reboot (even a normal restart), Yosemite will start with less code (especially if you don't restart with "load previous" ticked, that simply restarts that apps that were running and guess what? Uses the same RAM as before the restart). Booting in Safe mode doesn't start anything non-essential so starts with a lower RAM usage. As you open Apps and close them, even in Safe Mode, RAM used will climb.

Learn to ignore the RAM usage figures EXCEPT the Memory Pressure graph (should be green or yellow), and the Swapping figure (should be low, but what is acceptable is up to you, I was concerned at swapping several GB as I am on an SSD, but the speed wasn't a particular issue as swapping was fast, now I have 16GB I swap nearly zero and the system is even better at responding, others get concerned if you are swapping at all, IMHO swapping up to a GB is fine).

Oh and the 3GB you are "saving" by what the tech told you to do, it will bring you no benefit whatsoever...
 

Ethosik

Contributor
Oct 21, 2009
8,142
7,120
I am really surprised this is still going around. Windows Vista introduced this concept with Superfetch.

Until you get A LOT of swapping and bad memory pressure, do not worry about it.
 

carylee2002

macrumors 6502
Jul 27, 2008
255
71
I found that going back to Mtn. Lion was the best move for me and now my machine isn't running with a lot of ram being used by Safari. Also my temps are back down in the 40's celcius vs before it was in the 60's.
 
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