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Windows 7: Why is my pagefile going nuts when I extract something with Winrar?

28 May 2015   #11
Alejandro85

Windows 7 Ultimate x64
 
 

Quote   Quote: Originally Posted by tgfyhre View Post
I didn't think extracting a .rar directly (by using drag-and-drop) used RAM - that's why I was confused. I thought it just extracted from the .rar directly to the drive without using RAM? I guess that isn't the case? Is there a way to extract zip and rar files without using RAM?
Some RAM is always used for everything. In particular, running compression/uncompression algorithms can sometimes be very memory-intensive , that's not specific to WinRar, but most if not all similar programs eat some considerable memory when working. Particular to WinRar, the memory usage is highly dependant on the dictionary size used when creating the file, WinRar is very specific about it (it warns when using one larger than 128MB), but the global file size doesn't affects that much.
For extracting the files there is no way around using some amount of memory for that task, as it takes some serious effort to decode the compressed thing into the usable form again. When RAM is limited, Windows will fall back to use the pagefile, so it can grow very big during such operation, clogging the IO for that drive. You can mitigate that by uncompressing to a different physical drive instead if you have one, then moving the whole thing.


Quote   Quote: Originally Posted by Layback Bear View Post
Moving page file to another partition or drive to me is a no no.
Just curious, why is that?


My System SpecsSystem Spec
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28 May 2015   #12
tgfyhre

Windows 7 32bit Home Premium
 
 

Thank you.

Does having a large dictionary size affect the memory consumption of encoding/decoding if I have winrar set to"store"? Or is it only affected if I actually use compression?
My System SpecsSystem Spec
28 May 2015   #13
Alejandro85

Windows 7 Ultimate x64
 
 

When using store, there is no compression at all being done, so no, it uses minimal memory (in fact I believe that the dictionary size is ignored in such case). Store is just a plain copy-paste plus some internal file formating, nothing that requires substantial memory/CPU. But using that would defeat the purpose of using compression programs in the first place I suppose.
My System SpecsSystem Spec
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28 May 2015   #14
Layback Bear

Windows 7 Pro. 64/SP-1
 
 

From post #11
Quote:
Just curious, why is that?
I personally know of no good reason to do such a thing. But I'm willing to learn if their is a good reason.
If a system needs more ram it doesn't seem to me moving page files around does anything good. Windows 7 doesn't need to be looking for page files to do what needs to be done.

Like I said, I'm willing to learn and eager to do so.
My System SpecsSystem Spec
28 May 2015   #15
Alejandro85

Windows 7 Ultimate x64
 
 

Quote   Quote: Originally Posted by Layback Bear View Post
I personally know of no good reason to do such a thing. But I'm willing to learn if their is a good reason.
If a system needs more ram it doesn't seem to me moving page files around does anything good. Windows 7 doesn't need to be looking for page files to do what needs to be done.
It won't get more RAM, but there is a performance thing with this. Putting pagefile on a separate phyisical drive allows the OS to balance the IO load between it and other tasks (that is, Windows can use the pagefile and at the same time read/write some other data on a different disk). With all together both tasks compete for the drive attention, and usually end up waiting for each other to finish, slowing things down.
I think the OP is victim of this effect to some extent, as he says disabling the page file speeds the unpacking, but then he falls to the "insufficient memory" problem.

Putting it in a separate partition achieves nothing of this, it's just an administrative measure, like the "where do I want to take the disk space hit", as partitions share the same physical disk, hence use the same IO.
My System SpecsSystem Spec
28 May 2015   #16
lehnerus2000

W7 Ultimate SP1, LM18 MATE, W10IP VM, W10 Home, #All 64 bit
 
 
RAM Disc

Quote   Quote: Originally Posted by Layback Bear View Post
Let Windows 7 manage the ram because their is no magic tricks when you need more ram. Of course to use more ram you will need to install Windows 7/64 bit.
Moving page file to another partition or drive to me is a no no.
The best idea would be to upgrade to a 64 bit OS with more RAM (if possible).

However, if the OP's motherboard can take more RAM, they could add more and then create a RAM Disc.

My previous setup had 8GB of RAM and I was triple booting:
  • XP (32 bit)
  • W7 (64 bit)
  • LM17 (64 bit)
Since XP was only 32 bits, I had 4GB of RAM that couldn't be used.

I created a 4GB RAM Disc and then moved the page file to it.
XP seemed to run very smoothly with that arrangement.
My System SpecsSystem Spec
28 May 2015   #17
gregrocker

 

Have seen problems with WinRAR so I'd uninstall and try 7Zip which never causes problems.
My System SpecsSystem Spec
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 Why is my pagefile going nuts when I extract something with Winrar?




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