[Ironpython-users] IronPython always in 32-bit mode on 64bit machine even when running ipy64.exe

Chong, Petra (HARVEY NASH) Petra.Chong at uk.bp.com
Tue May 7 18:34:02 CEST 2013

(I also asked this on StackOverflow -
mode-on-64bit-machine-even-when-running-ipy64-exe - have copy pasted
from there). 


	I am sure I am missing something simple but unfortunately a lot
of searching hasn't thrown up what it is..

I am running Windows 7 64-bit (I verified this by looking at Control
Panel > All Control Panel Items > System and seeing that it says 64-bit
Operating System).

I have IronPython 2.7.3 installed from here
<http://ironpython.codeplex.com/downloads/get/423690> )

This has created the following shortcut (with no corresponding shortcut
in C:\Program Files\IronPython 2.7...):

"C:\Program Files (x86)\IronPython 2.7\ipy64.exe"

If I run this, I get this prompt:

"c:\Projects>"C:\Program Files (x86)\IronPython 2.7\ipy64.exe"
IronPython 2.7.3 ( on .NET 4.0.30319.296 (32-bit)

The docs from an older version of IronPython (2.6)
<http://ironpython.codeplex.com/releases/view/27350>  say that:

"A very visible new feature added to this release is that ipy.exe is now
strictly a 32-bit only assembly. That is, it gets executed as a 32-bit
CLR process on both x86 and x64 operating systems. ipy64.exe, despite
what its name might imply, is a platform agnostic assembly matching the
old behavior of ipy.exe in the sense that it gets executed as a 32-bit
process on 32-bit OSes and 64-bit on 64-bit OSes."

>From this, I infer that ipy64 should have started as a 64 bit process,
but that's not what shows in the prompt.

Any ideas what I am doing wrong? Thanks in advance..

Edited to add: I have also tried running the following in the IronPython
shell, which I found from another question on this site, to check
whether the OS is 64 bit

>>> import System
>>> System.Environment.Is64BitOperatingSystem

... but then I ran the following which indicates that IronPython really
is running in 32 bit mode.

>>> import System
>>> System.IntPtr.Size


I have tested that I have 64-bit .NET installed by creating a console
application in Visual Studio with the line
Console.WriteLn(System.IntPtr.Size) and verifying that the output is





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