Time to wake from sleep, 2015 FusionDrive iMacs

Discussion in 'iMac' started by zerozoneice, Jan 13, 2016.

?

How long does it take for your FusionDrive iMac to wake from sleep?

  1. 0-5 sec

    18 vote(s)
    75.0%
  2. 5-10 sec

    1 vote(s)
    4.2%
  3. 10-15 sec

    1 vote(s)
    4.2%
  4. More than 15 sec

    4 vote(s)
    16.7%
  1. zerozoneice macrumors regular

    Joined:
    Jun 26, 2013
    #1
    Just wondering how long does it take usually for 2015 iMacs with Fusiondrives to wake from sleep.
    Pretty much time taken from when you press a key or move mouse to seeing the desktop.
     
  2. MadDane macrumors 6502a

    Joined:
    Apr 5, 2015
    #2
    It only takes 1-2 seconds on my iMac (late 2009).
     
  3. bogg macrumors 6502

    bogg

    Joined:
    Apr 12, 2005
    Location:
    Sweden
    #3
    Doesn't that depend entirely on which Fusion drive and how much RAM you've got?
    If you have 32GB of RAM and a 1TB Fusion on the 2015 iMac it will take longer as the RAM dump won't fit inside the SSD part of the Fusion drive.
     
  4. maflynn Moderator

    maflynn

    Staff Member

    Joined:
    May 3, 2009
    Location:
    Boston
    #4
    I did it a couple of times and it was so quick I barely had time to start my stop watch app.

    This is off a M395 based iMac running on a 2TB Fusion drive.
     
  5. zerozoneice, Jan 14, 2016
    Last edited: Jan 14, 2016

    zerozoneice thread starter macrumors regular

    Joined:
    Jun 26, 2013
    #5
    u're kidding.
    same setup, doesn't come under 10 sec.
    maybe there's more sleep options?

    in the energy saver options i have only "put hard disks to sleep when possible" checked. All others are unchecked.

    i usually leave it running, screen fades at some point, then blacks out. This is in the evening. In the morning i touch spacebar and i never got under 10 seconds until i get the logon screen.

    For comparison, on my "old" late 2013 retina MBPro (512 SSD), it showed the logon screen almost instantaneously when i opened the lid
     
  6. bogg macrumors 6502

    bogg

    Joined:
    Apr 12, 2005
    Location:
    Sweden
    #6
    How much ram and what fusion drive?
     
  7. zerozoneice thread starter macrumors regular

    Joined:
    Jun 26, 2013
    #7
    8GB Ram and 2TB Fusion with 128GB SSD part...so that can't be it...
    Late 2015 27" 5K iMac...the one with M395 GPU, default config.

    @maflynn you cheater :)
    http://forums.macrumors.com/threads/does-sleep-mean-sleep-on-imac.1950092/#post-22461484
     
  8. Samuelsan2001 macrumors 603

    Joined:
    Oct 24, 2013
    #8
  9. maflynn Moderator

    maflynn

    Staff Member

    Joined:
    May 3, 2009
    Location:
    Boston
    #9
    Yep, hard drive is set to sleep.

    That's my configuration.
     
  10. zerozoneice thread starter macrumors regular

    Joined:
    Jun 26, 2013
    #10
    maflynn's setup wakes up so fast because his drive never sleeps..
    default OS settings are "wake on lan" and "put hdd to sleep when possible", so the hdd will eventually fall asleep, that's what's causing the long wake up time. I have no idea though after what time the hdd is put to sleep...
     
  11. bogg macrumors 6502

    bogg

    Joined:
    Apr 12, 2005
    Location:
    Sweden
    #11
    If he puts the computer to sleep manually the drives will sleep, that checkbox only disables them from automatically going to sleep after a time of inactivity.
     
  12. zerozoneice thread starter macrumors regular

    Joined:
    Jun 26, 2013
    #12
    but isn't it the same thing?
    manually sleeping it vs. leaving it alone inactive for whatever time, until it...sleeps?
    --- Post Merged, Jan 14, 2016 ---
    it was like this since i powered it on first time out of the box and completed the el capitan setup.
     
  13. maflynn Moderator

    maflynn

    Staff Member

    Joined:
    May 3, 2009
    Location:
    Boston
    #13
    No you misunderstood me. I said that the sleep option for the drive is checked.
    --- Post Merged, Jan 14, 2016 ---
    And that's how I tested the timing, by manually putting it into sleep.
     
  14. Samuelsan2001 macrumors 603

    Joined:
    Oct 24, 2013
    #14
    That doesn't mean a reinstall won't sort out your issue, it has proved to sort out many niggles on new computers in the past.
     
  15. bogg macrumors 6502

    bogg

    Joined:
    Apr 12, 2005
    Location:
    Sweden
    #15
    If he has set it to never sleep it will never sleep by itself (That is, it won't sleep automatically after a certain time). It will still sleep if he tells it to sleep manually.

    You could disable safesleep by issuing the following command in a terminal window:
    Code:
    sudo pmset -a hibernatemode 0
    it will revert it to not dump the ram to the hard drive. I don't see the point in safesleep on a desktop computer anyway. It will have to boot from scratch if the power cord is removed while it sleeps (with safesleep it restores the state from the dump-image).



    Maflynn: Did you wait a few hours before trying to wake it up? Dumping the RAM to a sleep image is in my experience not a immediate action but can take a minute or so until actually performed (if safesleep is activated) and then "Deep Sleep" really isn't activated in a while anyway as it only enters that if the computer is left in sleep for quite a long time from my experience.

    First it enters Sleep, after a while it will go even deeper down into Deep Sleep, which basically shuts most of the computer off and when started it restores the ram contents from the sleepimage (which takes a second or two depending on the speed of your drives).

    This is atleast my understanding of how it works.
     
  16. maflynn Moderator

    maflynn

    Staff Member

    Joined:
    May 3, 2009
    Location:
    Boston
    #16
    Definitely at this point, the OP has nothing to lose (provided he has a backup of his data).
     
  17. imacken macrumors 65816

    Joined:
    Feb 28, 2010
    #17
    I have had an ongoing discussion with Applecare about my late 2015 iMac (with 2Tb fusion drive and 32Gb RAM) and wake times for weeks now.
    Sometimes after overnight sleep, my Mac wakes in a second or two, but sometimes it can take up to a minute!
    It seems to be random.
    A clean install made no difference, and Applecare are talking about a hardware issue.
     
  18. zerozoneice, Jan 15, 2016
    Last edited: Jan 15, 2016

    zerozoneice thread starter macrumors regular

    Joined:
    Jun 26, 2013
    #18
    ok tested 2 scenarios:

    if i manually choose the sleep option, wait until the hdd spins down, fans off, then waited couple of minutes, then touched spacebar, i get the same behavior as maflynn..2-3 seconds, login screen.

    if i leave it for a long time (eg. overnight), it will dim the screen and then eventually sleep. When waking up, it never shows the login screen under 10 seconds..

    seems "auto" deep sleep is slow as hell to wake up
    --- Post Merged, Jan 15, 2016 ---
    that should kind of have the opposite effect, shouldn't it?

    normally:
    prevent mechanical drive to sleep -> faster wake from sleep (all kinds of sleep, manual or auto)
    sleep mechanical drive -> slower wake (manual sleep)

    for me is the opposite:
    setting manual sleep it will wake up in 3 seconds
    letting it autosleep (with prevent HDD to sleep option checked), it wakes in 10+ seconds
    --- Post Merged, Jan 15, 2016 ---
    same randomness here when waking up after overnight sleep, but never below 8-9 seconds...sometimes 15

    One thing i'm thinking about is that in deep(est) sleep mode, the RAM image is dumped/moved? to HDD instead of SSD, and therefore when waking up, it needs to wait for HDD to power & spin on before restoring. Manual sleep seems to dump RAM to SSD, seems the only explanation for the huge difference in wake up times between the 2 sleep modes....
     
  19. bogg, Jan 15, 2016
    Last edited: Jan 15, 2016

    bogg macrumors 6502

    bogg

    Joined:
    Apr 12, 2005
    Location:
    Sweden
    #19
    The mechanical drive will sleep if you manually set the computer to sleep. The setting to disable the drives from sleeping is mostly useful for secondary hard drives which will enter sleep mode if no application uses them when the computer is ON (this usually doesn't effect the system drive, but could on Fusion drives as most of the OS will be on the SSD). Of course the drives will spin down if the computer sleeps, that's the whole point of "Sleep", no setting on the computer will prevent the hard drive from spinning down when entering sleep. It doesn't matter if the computer enters sleep by itself or by the users action, the drives _will_ spin down when entering sleep. As said, the checkbox only sets it not to spin down while the computer is awake.

    But, to get on track:

    If you manually set it to sleep and then wake it up a few minutes later, it will wake up faster as it hasn't entered "Deep Sleep" aka hibernation yet. This only occurs if the computer is left in sleep for an extended period of time.
    So when you let it be overnight it will first go to sleep automatically after a while, dump the ram to disk and then after a while shut down the RAM as well (thus the need to re-read the ram contents from SSD/HD), this should happen just as well if you manually put it to sleep before going to bed, when you wake up in the morning it should still have entered the

    The computer will put the sleepimage on the SSD primarily, but if you have more RAM than free space on the SSD part it will not be able to do so and thus write it to HD (This is why the 1TB fusion isn't recommended for users with 32GB of RAM, as the 32GB sleepimage won't fit on the 24GB SSD).
     
  20. JustMartin macrumors 6502a

    Joined:
    Feb 28, 2012
    Location:
    UK
    #20
    My late 2012 fusion is set to sleep automatically after 3 hours. So, usually by the time I come into the study in the morning, it's been asleep for 10 or 11 hours. Hit the shift key and the screen is up pretty much instantaneously.
     
  21. zerozoneice thread starter macrumors regular

    Joined:
    Jun 26, 2013
    #21
    i get your points, but..8GB RAM should fit just fine on the 128GB SSD of my 2TB Fusion.
    Manual sleep seems to work fine for short "sleeps", but i will test tonight to manually sleep it instead of letting it idle to sleep :)

    seems to be an issue with this deep sleep/hibernation, when the RAM dump obviously is read from HDD instead of SSD, since it obviously needs to wait for HDD to spin up and then read the image, otherwise from SSD it would be up & running in couple of seconds max. Agree?
     
  22. zerozoneice thread starter macrumors regular

    Joined:
    Jun 26, 2013
    #22
    ok, same effect. no matter if put to sleep manually or let it idle to sleep, coming out of deep sleep/hibernation has the same effect: drive spins up, screen backlight comes on after 5-6 seconds, then eventually login screen appears after around 8-10 sec.
     
  23. bogg macrumors 6502

    bogg

    Joined:
    Apr 12, 2005
    Location:
    Sweden
    #23
    Try enabling power nap, that should solve the slow wake up, or try the pmset command I stated earlier in this thread.
     
  24. henry72 macrumors 65816

    henry72

    Joined:
    Jun 18, 2009
    Location:
    New Zealand
    #24
    I've had this experience with my 2013 model, same issue when I tried to turn it on in the morning from "deep sleep". It takes about 30 seconds which is pretty ridiculous that's why returned it.

    Looks like Apple hasn't addressed the issue yet, or never will as flash storage become more popular.

    Good luck :)
     
  25. imacken macrumors 65816

    Joined:
    Feb 28, 2010
    #25
    Did you get a replacement? Was it any better?
     

Share This Page