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Mar
7
awarded  Notable Question
Dec
30
awarded  Popular Question
Nov
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awarded  Teacher
Nov
30
answered Why are computer power supplies seemingly inefficient?
Nov
30
revised Does 64bit Windows 8 “low memory warning” have same limits as in Windows 7 x64?
Replaced question body with more explicit and self-explanatory version. Hopefully this clears up unnecessary arguing.
Nov
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comment How much RAM 64bit Windows 8 reserves to OS internal use?
Yes, the limit is there but is it at the same amount as previously? In W7 x64 it appears the limit is percentage of the total memory. In 4GB box you can use about 3GB RAM, with 8GB box this grows to 6.4GB and with 12GB (from the link) you hit the limit at 10GB usage.
Nov
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revised How much RAM 64bit Windows 8 reserves to OS internal use?
fix links
Nov
29
asked How much RAM 64bit Windows 8 reserves to OS internal use?
Nov
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revised Does 64bit Windows 8 “low memory warning” have same limits as in Windows 7 x64?
Some process explorer shots
Nov
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comment Does 64bit Windows 8 “low memory warning” have same limits as in Windows 7 x64?
Both of the links I present come around to the same 20% figure, note how he says he has "2GB+ free memory" in the 1st one.
Nov
6
comment Does 64bit Windows 8 “low memory warning” have same limits as in Windows 7 x64?
Yet this 3GB of RAM will not get utilized regardless of your pagefile size. Or 2.4GB if we take 80% to be the right figure, not 75%. You're essentially saying "There is a portion of RAM which can grow without upper limit that will not get used but it's OK because we can use pagefile" Ergo: Does Windows 8 allocate larger amount of system RAM to applications when necessary or does it keep 20% (or 25%) in "reserve" regardless of installed memory size.
Nov
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awarded  Commentator
Nov
6
revised Does 64bit Windows 8 “low memory warning” have same limits as in Windows 7 x64?
added 408 characters in body
Nov
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comment Does 64bit Windows 8 “low memory warning” have same limits as in Windows 7 x64?
No, the upper limit is 25% of the total RAM. Somehow you seem to have trouble accepting that Windows is by design not able to allocate a portion of he RAM to applications. You can increase page file size and still not use the last quarter of the RAM, this does not change. Another reference claims the limit is 80%, not 75%.
Nov
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comment Does 64bit Windows 8 “low memory warning” have same limits as in Windows 7 x64?
@David, I happen to think it's "wrong" to grow this "backing store" without upper limit, which is what happens with W7 x64. On this machine right now I have 6.2GB "in use". The system constantly reallocates RAM into pagefile to keep "in use" at 6GB mark. (down to 6.1GB now). There's 600MB cache, 19MB kernel, 8MB driver allocation and 1.9GB unallocated. That cache does not get reallocated to application use in low memory condition, incidentally.
Nov
6
comment Does 64bit Windows 8 “low memory warning” have same limits as in Windows 7 x64?
This machine where I'm writing this for example. Removing page file just makes the behavior explicit. "Why are you complaining you do not have memory when there is still 3GB reserve left?!". With pagefile it becomes a bit more fuzzy but the same behavior persists. Most people create huge pagefiles which will make the system unusable long before they'd see the low memory warning. With reasonable pagefile (like 2GB) you will run into the same behavior when system cannot move more "stuff" into the pagefile anymore. Which is what I wrote in the OP.
Nov
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comment Does 64bit Windows 8 “low memory warning” have same limits as in Windows 7 x64?
@David, The moment where low memory warning kicks in, there is plenty of RAM on a box with 8GB memory available to be committed. After all, windows can "overallocate" into the memory between 6 and 7GB. It just doesn't like it, hence the warning. The "promised to be committed" amount in 16GB machine becomes truly ridiculous (4GB) as it's not tied to actual use but into a fixed percentage hard-coded into the system.
Nov
6
comment Does 64bit Windows 8 “low memory warning” have same limits as in Windows 7 x64?
No, the low memory warning is tied to the amount of RAM actually in use. Increasing page file will not change this behavior. System with 4GB pagefile will not allocate any more RAM at all to apps compared to system with 2GB pagefile, you will still get low memory warning with exact same amount of unallocated RAM. In other words, you may be using 95% of your virtual memory with big pagefile but you get low memory warning the instant system is forced to commit more than 75% of RAM for apps. There is another, higher threshold where windows actually refuses to allocate any memory.
Nov
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comment Does 64bit Windows 8 “low memory warning” have same limits as in Windows 7 x64?
@David, it's not "overcommitting" if you get low memory warning when you have in fact plenty of unused memory. That's the whole point here. System is saying it does not have any memory available while in fact it does have plenty left. The threhold is also a percentage so somehow 8GB machine needs 2x space for "OS" to breathe compared to 4GB machine. Does W8 change the low memory warning limit value or does it not. If it does, what is the new value?
Nov
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comment Does 64bit Windows 8 “low memory warning” have same limits as in Windows 7 x64?
Increasing page file size will of course allow more memory to be committed but it won't change the low memory warning threshold or make W7 x64 use last 25% of RAM for applications. WRT pagefile size, on HDD 2GB is already a lot. 3GB is borderline useless if it's actually accessed. "1.5x RAM amount" is ancient wisdom from WfWG era, hardly valid for today. Mark Russinovich article here discusses that. Note also Pavel's comment VRT Vista virtual memory design choices. blogs.technet.com/b/markrussinovich/archive/2008/11/17/…