RE: [GD-Windows] How to determine total physical memory available ?

[Simon O'C. <si...@sc...>]

Jeffrey Richter's excellent Programming Appplications for Windows (MS =
Press)
has the following to say about the missing memory in the physical total:

"The dwTotalPhys member indicates the total number of bytes of physical
memory (RAM) that exist. On this 128-MB Pentium II machine, this value =
is
133,677,056, which is just 540,672 bytes under 128 MB.
The reason GlobalMemoryStatus does not report the full 128 Mb is that =
the
system reserves some storage as a nonpaged pool during the boot process.
This memory is not even considered available to the kernel. The =
dwAvailPhys
member indicates the total number of bytes of physical memory available =
for
allocation."

> -----Original Message-----
> From: gam...@li...=20
> [mailto:gam...@li...] On=20
> Behalf Of Carsten Orthbandt
> Sent: 26 January 2004 20:08
> To: gam...@li...
> Subject: RE: [GD-Windows] How to determine total physical=20
> memory available ?
>=20
> IIRC, GlobalMemoryStatus returns the actual amount of RAM=20
> minus the DOS-inherited 640 kB base memory.
> After actually checking that: Yep, add 640 kB (=3D655360 byte)=20
> to the value in xMS.dwTotalPhys and you got the real value.
> When doing anything of this kind, please consider using=20
> GlobalMemoryStatusEx on Win2k/XP systems. We're not that far=20
> from systems having the full 4GB space equipped.
>=20
> Carsten Orthbandt
> Founder + Development Director
> SEK SpieleEntwicklungsKombinat GmbH
> http://www.sek-ost.de
>=20
> Wenn ich Visionen habe, gehe ich zum Arzt. - Helmut Schmidt
> =20
>=20
> > -----Original Message-----
> > From: gam...@li...
> > [mailto:gam...@li...]=20
> On Behalf Of=20
> > Yannick Letourneau
> > Sent: Monday, January 26, 2004 8:47 PM
> > To: gam...@li...
> > Subject: [GD-Windows] How to determine total physical=20
> memory available=20
> > ?
> >=20
> >=20
> > I need to determine how much memory is installed on the=20
> user's system=20
> > somehow.
> >=20
> > I used GlobalMemoryStatus but the values returned in the member=20
> > dwTotalPhys is always underestimating a bit.  For example on my dev=20
> > machine it returns
> > 1022 MB although I have 1024 MB installed.  Same thing=20
> happens on all=20
> > systems I've tested.
> >=20
> > Same thing is reported in dxdiag.exe so they seem to use=20
> that function=20
> > as well.
> >=20
> > However, when I use the System Information tool in the=20
> system tools of=20
> > Windows, it correctly reports 1024 MB.
> >=20
> > So anyone knows how I can get the exact information ?
> >=20
> > Yannick L=E9tourneau
> > UBISOFT
> >=20
> >=20
> >=20
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