From: java@evij.com.invalid   
      
   On 14/05/2024 12:17, Paul wrote:   
   >   
   > On 5/14/2024 6:30 AM, Java Jive wrote:   
   >>   
   >> On 13/05/2024 13:06, Java Jive wrote:   
   >>>   
   >>> Windows 7 through 10 64-bit with LOTS of software installed, but search   
   indexing, which consumes disk space like there's no tomorrow, disabled,   
   hibernation and paging (large files) enabled, 64GB is comfortably enough for   
   me, though occasional    
   housekeeping is beneficial.   
   >>   
   >> Although I have 21.7GB free on a Windows OS partition, I've just found a   
   situation where I may have to enlarge it.  A few days ago I increased the RAM   
   on one of my principal PCs from 16GB to 32GB, and late yesterday evening I   
   noticed that hibernation    
   is now disabled.  When I try to re-enable it using ...   
   >>   
   >>      powercfg.exe /hibernate on   
   >>   
   >> ... I get ...   
   >>   
   >>      error 0xc000007f   
   >>   
   >> Although I've not yet succeeded in fixing the problem, I'm working on the   
   assumption that the doubling of memory requires a corresponding increase in   
   hibernation file size, and that there isn't room for it, hence the error.    
   Having only yesterday    
   given a figure for a Windows system partition which then I deemed should be   
   adequate, I thought I ought to correct my previous statement.   
   >   
   > I don't bother with hibernate, especially with SSD drives and large RAM   
   onboard.   
   > I think the hibernate still works on my laptop (small RAM).   
   >   
   > Hibernate on Windows, uses compression. The hiberfil.sys can be set to 50%   
   of RAM,   
   > and it will still accept that. However, if it attempts to hibernate, and it   
   > really really needs to write out all the RAM, the compression may not be   
   sufficient   
   > to complete the operation, and it will then back out. And that's not   
   desirable   
   > on a laptop, as sometimes it is hibernating because the battery is flat.   
   >   
   > Hibernate, records "occupied RAM". When a computer is idle, the idle RAM   
   consumption   
   > can be small, and the length of writes to the hiberfile can be short. It can   
   still   
   > be compressed. As a result, each hibernate might only burn up 1GB of wear   
   life on the SSD.   
   > Only if you're doing a VHDL chip simulation, might you fill the entire RAM,   
   and   
   > have a compression failure on a hibernation attempt :-) It does not normally   
   need   
   > very much of the hiberfile.   
   >   
   > But it is still fairly conservative about what settings it will accept,   
   > even if the statistical reality is not remotely similar.   
   >   
   > The hiberfile, per session, needs at least the header to be overwritten,   
   > to invalidate it. When you request hibernation, it writes a valid header,   
   > and depending on how many applications are loaded, the footprint might be   
   > reasonably small. If Firefox has gobs of tabs and gigabytes per tab, then   
   > it's not going to end well for you. With conventional hard drives, it   
   > can take *eight minutes* to finish hibernation in pathological cases.   
   >   
   > *******   
   >   
   > It pays to understand what the dual purposes of the files are, whether   
   > you're on Linux or Windows. Some "dumping" type activities, rely on a   
   > certain file for their dump, and then the file must be sized for the   
   > entire RAM (plus a little). You might make such an allocation, and   
   > never really use it.   
   >   
   > SSDs are getting bigger, so making the files full size is now possible.   
   > But the SSDs also aren't getting cheaper. They're about double the   
   > price of last fall, for some models. Which is an impediment to acquiring SSDs   
   > right now. I don't expect it to get any better (like, after an earthquake   
   > near the fab).   
      
   As always, thanks for your helpful comments, Paul.   
      
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