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<sorry for my bad english>

Hallo!
I would like to know who does "manage" the memory amount in this scenario:

Vista64 (business, pro ... ) with 20 GB of ram.

four 32-bit applications that run simultaneously

Will all these applications use all the memory amount that they can manage
(about 3,5 gb if I know correctly) or will they see only the first 3,5 gb of
ram even if we have much more?

I imagine this:

00:00:10 - free ram 19,5 on 20 GB
00:00:15 - start 32bit app #1
00:00:16 - will app#1 see 3,5 gb or 3,0? let's suppose: 3,5 ; I now use all
the ram app#1 can use.
00:00:30 - free ram is now 16,0 on 20 GB
00:00:31 - start 32bit app #2
00:00:32 - will app#2 see 3,5 gb or 0?
....
and so on.

I hope it was clear enough.
Can you help me?

</sorry for my bad english>

Each 32 bit application gets 4 GB of _virtual memory address space_. That's
not quite the same thing as RAM, though it's often confused with RAM. IAC,
for your purposes, each application is treated separately.

--
Charlie.
http://msmvps.com/blogs/xperts64
http://mvp.support.microsoft.com/profile/charlie.russel

"ZF" <> wrote in message
news:...
> <sorry for my bad english>
>
> Hallo!
> I would like to know who does "manage" the memory amount in this scenario:
>
> Vista64 (business, pro ... ) with 20 GB of ram.
>
> four 32-bit applications that run simultaneously
>
> Will all these applications use all the memory amount that they can manage
> (about 3,5 gb if I know correctly) or will they see only the first 3,5 gb
> of ram even if we have much more?
>
> I imagine this:
>
> 00:00:10 - free ram 19,5 on 20 GB
> 00:00:15 - start 32bit app #1
> 00:00:16 - will app#1 see 3,5 gb or 3,0? let's suppose: 3,5 ; I now use
> all the ram app#1 can use.
> 00:00:30 - free ram is now 16,0 on 20 GB
> 00:00:31 - start 32bit app #2
> 00:00:32 - will app#2 see 3,5 gb or 0?
> ...
> and so on.
>
> I hope it was clear enough.
> Can you help me?
>
> </sorry for my bad english>

In message <> "ZF"
<> was claimed to have wrote:

><sorry for my bad english>
>
>Hallo!
>I would like to know who does "manage" the memory amount in this scenario:
>
>Vista64 (business, pro ... ) with 20 GB of ram.
>
>four 32-bit applications that run simultaneously
>
>Will all these applications use all the memory amount that they can manage
>(about 3,5 gb if I know correctly) or will they see only the first 3,5 gb of
>ram even if we have much more?
>
>I imagine this:
>
>00:00:10 - free ram 19,5 on 20 GB
>00:00:15 - start 32bit app #1
>00:00:16 - will app#1 see 3,5 gb or 3,0? let's suppose: 3,5 ; I now use all
>the ram app#1 can use.
>00:00:30 - free ram is now 16,0 on 20 GB
>00:00:31 - start 32bit app #2
>00:00:32 - will app#2 see 3,5 gb or 0?
>...
>and so on.
>
>I hope it was clear enough.
>Can you help me?
>
></sorry for my bad english>

Each application gets 2GB of private virtual address space, or if
compiled with the /LARGEADDRESSAWARE switch then 4GB of private virtual
address space.

Each and every 32-bit application gets this same 2GB of address space
regardless of whether you have 1GB or 20GB of memory on the physical
system.

With four 32-bit applications (with /LARGEADDRESSAWARE) each can use a
full 4GB and you wouldn't necessarily be paging if you have 20GB of
total system RAM.

Actually, they get the full 4 GB of virtual memory address space, they just
don't know what to do with it, so ignore it. But the OS assigns them the
space, so far as I know.

--
Charlie.
http://msmvps.com/blogs/xperts64
http://mvp.support.microsoft.com/profile/charlie.russel

"DevilsPGD" <> wrote in message
news:...
> In message <> "ZF"
> <> was claimed to have wrote:
>
>><sorry for my bad english>
>>
>>Hallo!
>>I would like to know who does "manage" the memory amount in this scenario:
>>
>>Vista64 (business, pro ... ) with 20 GB of ram.
>>
>>four 32-bit applications that run simultaneously
>>
>>Will all these applications use all the memory amount that they can manage
>>(about 3,5 gb if I know correctly) or will they see only the first 3,5 gb
>>of
>>ram even if we have much more?
>>
>>I imagine this:
>>
>>00:00:10 - free ram 19,5 on 20 GB
>>00:00:15 - start 32bit app #1
>>00:00:16 - will app#1 see 3,5 gb or 3,0? let's suppose: 3,5 ; I now use
>>all
>>the ram app#1 can use.
>>00:00:30 - free ram is now 16,0 on 20 GB
>>00:00:31 - start 32bit app #2
>>00:00:32 - will app#2 see 3,5 gb or 0?
>>...
>>and so on.
>>
>>I hope it was clear enough.
>>Can you help me?
>>
>></sorry for my bad english>
>
> Each application gets 2GB of private virtual address space, or if
> compiled with the /LARGEADDRESSAWARE switch then 4GB of private virtual
> address space.
>
> Each and every 32-bit application gets this same 2GB of address space
> regardless of whether you have 1GB or 20GB of memory on the physical
> system.
>
> With four 32-bit applications (with /LARGEADDRESSAWARE) each can use a
> full 4GB and you wouldn't necessarily be paging if you have 20GB of
> total system RAM.

I would like to know if several 32-bit applications running at the same time
on a 64-bit version of Windows will be able to utilize the actual RAM
better.
In other words, is Windows Vista 64bit able to spread out each 32-bit
process virtual memory to RAM if the 64-bit system has for example 16GB of
RAM?

/Magnus

Magnus Flysjö wrote:
> I would like to know if several 32-bit applications running at the
> same time on a 64-bit version of Windows will be able to utilize
> the actual RAM better.
> In other words, is Windows Vista 64bit able to spread out each
> 32-bit process virtual memory to RAM if the 64-bit system has for
> example 16GB of RAM?
>

Yes, the virtual addresses are mapped to any part of the physical
memory. The limitation on 32 bit programs is the SIZE of the memory it
can access.


Bo Persson

Magnus Flysjö wrote:
> I would like to know if several 32-bit applications running at the
> same time on a 64-bit version of Windows will be able to utilize the
> actual RAM better.
> In other words, is Windows Vista 64bit able to spread out each 32-bit
> process virtual memory to RAM if the 64-bit system has for example
> 16GB of RAM?
>
> /Magnus

i see that DevilsPGD said "With four 32-bit applications (with
/LARGEADDRESSAWARE) each can use a
full 4GB and you wouldn't necessarily be paging if you have 20GB of
total system RAM."

Charlie Russel - MVP wrote:
> Each 32 bit application gets 4 GB of _virtual memory address space_.
> That's not quite the same thing as RAM, though it's often confused
> with RAM. IAC, for your purposes, each application is treated
> separately.

Many many thanks, Charlie!

DevilsPGD wrote:
[...]

> Each application gets 2GB of private virtual address space, or if
> compiled with the /LARGEADDRESSAWARE switch then 4GB of private
> virtual address space.

if i, as a user and not a programmer, have a standard 32 application like
(for example) Photoshop (CS3), Some MS Office apps (ver 2003) ... i can't
compile, am I right? So it's impossible to me to use that switch, isn't it?

> Each and every 32-bit application gets this same 2GB of address space
> regardless of whether you have 1GB or 20GB of memory on the physical
> system.
>
> With four 32-bit applications (with /LARGEADDRESSAWARE) each can use a
> full 4GB and you wouldn't necessarily be paging if you have 20GB of
> total system RAM.

that's great.
can you clarify to me if that /LARGEADDRESSAWARE is something I can use or
is only a programmer's matter?

thanks DevilsPGD!

Bo Persson wrote:
> Magnus Flysjö wrote:
>> I would like to know if several 32-bit applications running at the
>> same time on a 64-bit version of Windows will be able to utilize
>> the actual RAM better.
>> In other words, is Windows Vista 64bit able to spread out each
>> 32-bit process virtual memory to RAM if the 64-bit system has for
>> example 16GB of RAM?
>>
>
> Yes, the virtual addresses are mapped to any part of the physical
> memory. The limitation on 32 bit programs is the SIZE of the memory it
> can access.

Supposing I have 4 gb of ram, what happens if i open 4 apps and try to make
them eat all the memory they can use?
We said each 32bit app sees 2 or 4 gb (let's say 2 for now)
every app sees 2 gb of free "memory address space", so we have 2+2+2+2 = 8
.... I think the OS can resize the response of what's the total and the free
available "memory address space" , right?

so if isn't used they see 2 gb, but when they reach *really* the maximum
memory usage ... what happens?