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sleepimage just 1 GB insize by 16 GB RAM?
- Thread starter boppin
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What are you confused about? it needed 1gb to save the information you were using and the computer configuration sleep image before it slept that's all.
That's interesting because my white 2009 Macbook has 8 GB of RAM but uses an 4 GB sleepimage running on Sierra.
My old 2011 MBP had 8 GB of RAM and also used a sleepimage in 4 GB of size. (When it had 16 GB, the sleepimage was 8 GB)
So I was wondering that my 2012 Retina MBP just uses 1 GB.
My old 2011 MBP had 8 GB of RAM and also used a sleepimage in 4 GB of size. (When it had 16 GB, the sleepimage was 8 GB)
So I was wondering that my 2012 Retina MBP just uses 1 GB.
Hello evec!
Thanks for your reply!
This explains everything. Thank you!
But this applies to Apple OEM SSD only, right?
Thanks for your reply!
This explains everything. Thank you!
But this applies to Apple OEM SSD only, right?
With my MacBook Pro's, I DISABLE the sleep image using terminal:
sudo pmset -a hibernatemode 0
Then, I DELETE the existing image:
sudo rm /private/var/vm/sleepimage
Next, I create a NEW, "empty" sleep image:
sudo touch /private/var/vm/sleepimage
Finally, I "lock" the new image, so that it cannot be changed by the OS:
sudo chflags uchg /private/var/vm/sleepimage
Now, the sleep image is disabled, and cannot "grow in size" since it's locked "as a new, small file".
As you might have guessed, I don't care about having a sleep image, and I DON'T want it messing with my MacBooks!
sudo pmset -a hibernatemode 0
Then, I DELETE the existing image:
sudo rm /private/var/vm/sleepimage
Next, I create a NEW, "empty" sleep image:
sudo touch /private/var/vm/sleepimage
Finally, I "lock" the new image, so that it cannot be changed by the OS:
sudo chflags uchg /private/var/vm/sleepimage
Now, the sleep image is disabled, and cannot "grow in size" since it's locked "as a new, small file".
As you might have guessed, I don't care about having a sleep image, and I DON'T want it messing with my MacBooks!
Are you mean your sleepimage file size ? It just normal.
Please notice that OS will create 1GB file size not mean it should require to write 1GB data in SSD, it can be just hold 1GB.
As Apple balance of SSD life and battery, nowadays the memory image will not save to disk immediately, it only save to disk unplugged of external power supply and when use battery after few hours or battery very low.
OP wrote:
"before sleep, no swap, after sleep several GB..."
With 16gb of RAM, you could -try- disabling VM disk swapping by using this terminal command:
sudo launchctl unload -wF /System/Library/LaunchDaemons/com.apple.dynamic_pager.plist
Then use this command to remove the swap file:
rm /var/vm/swapfile*
I'd try that, and run that way a few days.
If you start getting crashes, it's easy enough to RE-ENABLE swapping with this command:
sudo launchctl load -wF /System/Library/LaunchDaemons/com.apple.dynamic_pager.plist
Personal experience:
I've been running with VM swap DISABLED for a couple of years now, without a single crash.
This is on a 2012 Mini, 10gb RAM, OS 10.11.6.
I -do- quit apps I don't need, and don't load up browsers with dozens of pages...
"before sleep, no swap, after sleep several GB..."
With 16gb of RAM, you could -try- disabling VM disk swapping by using this terminal command:
sudo launchctl unload -wF /System/Library/LaunchDaemons/com.apple.dynamic_pager.plist
Then use this command to remove the swap file:
rm /var/vm/swapfile*
I'd try that, and run that way a few days.
If you start getting crashes, it's easy enough to RE-ENABLE swapping with this command:
sudo launchctl load -wF /System/Library/LaunchDaemons/com.apple.dynamic_pager.plist
Personal experience:
I've been running with VM swap DISABLED for a couple of years now, without a single crash.
This is on a 2012 Mini, 10gb RAM, OS 10.11.6.
I -do- quit apps I don't need, and don't load up browsers with dozens of pages...
... and do not hibernate/standby at all, which means the battery drains faster when computer is left idle for some hours. For example, mine 2015 MBP's overnight drain is ~2% with standby on and ~20-30% without. Wakeup from such standby is only the matter of 1-2 secs (not mins like on PCs or old MBPs, before 2012) so you are robbing yourself from quite a handy power-saving feature.