[mapserver-users] 64 bit Windows OS

[Tamas Szekeres]

Bruce,

If you'd run your application in 32 bit mode (by using 32 bit
binaries) you can consider the following options:

1. If you are using IIS6 (Windows Server 2003) you cannot run 32 bin
and 64 bit applications simultaneously. You can force to execute IIS
in 32 mode globally according to
http://support.microsoft.com/kb/894435/en-us
In this case you might also force the compilation of your application
to 32 bit by specifying the platform target to x86, something like:
<%@ Page Language="C#" ... CompilerOptions="/platform:x86" %>

This can be specified in the application web.config file as well.


2. If you are using IIS7 the 32 bit and 64 bit ASP.NET applications
can be run side by side. For more information in this topic refer to
the following article:
http://blogs.msdn.com/rakkimk/archive/2007/11/03/iis7-running-32-bit-and-64-bit-asp-net-versions-at-the-same-time-on-different-worker-processes.aspx
In this case you'll also have to set CompilerOptions="/platform:x86
with your application.


With regards to the 64 bit path all of the dependencies have to be
compiled for x64 then. You might have to consider which features
should be included in the compilation many of the dependencies can be
compiled fairly well, however for some of the drivers like SDE I
couldn't obtain the proper version of the .lib and .dll files to
accomplish this task.

Best regards,

Tamas



2008/10/28 Bruce Cheney <BLC at jub.com>:
> Thank you Tamas and Frank.  I believe that effectively answers my
> questions.  We are running C#, ASP.Net on a Win64 machine so the setup
> requires (or would best be suited for) a 64bit version. In the stated
> situation the 32 bit version does not work. So we may leave the machine
> in 64 bit and set the site to 32 bit in IIS or venture down the path of
> building all the libraries for 64 bit. If we switch the site to 32bit we
> may then be able to use the extra RAM through the OS as overflow.
>
> In venturing down the 64 bit path I am most concerned about all the
> supporting libraries being converted/compiled for 64bit. If this is
> laborious as you say then I also would assume it means it requires
> enough knowledge to get all the ducks lined up correctly.  This path may
> be one for me to venture down during a significantly large development
> cycle - if ever.
>
> With the direction of all new hardware being 64 bit will the standard
> distribution of mapserver become also 64 bit?  Unless in a majority of
> situations it just doesn't make any difference.
>
>
> Bruce Cheney
> Gateway Mapping, Inc
> www.gatewaymapping.com
> 801.221.7656
>
> -----Original Message-----
> From: mapserver-users-bounces at lists.osgeo.org
> [mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of Frank
> Warmerdam
> Sent: Monday, October 27, 2008 6:27 PM
> To: Bruce Cheney
> Cc: mapserver-users at lists.osgeo.org
> Subject: Re: [mapserver-users] 64 bit Windows OS
>
> Bruce Cheney wrote:
>>
>> What are the current plans for supporting 64 bit Windows OS?
>> Already doing it and I missed it?
>> What would be reasons for not actively pursuing this?
>> Are some of the supporting binaries to difficult to convert over or
>> MapServer itself?
>> Is it the challenge of maintaining two paths 32 bit and 64 bit?
>
> Bruce,
>
> I believe MapServer and it's supporting libraries can already be
> somewhat laborously built for Win64.  There is no fundamental problem
> with the software that would make it incompatible.
>
>> The reasons I am asking are:
>>
>> Hardware and OS are coming this way now - 64 bit. We must go to some
>> effort to downgrade to 32 bit.  The 64 bit obviously supports more
> RAM.
>> More RAM = more concurrent users.  And there are probably other good
>> reasons that I am at a loss to remember.
>>
>> Thanks for any wisdom you might have in this regards.
>
> Honestly, a single instance of mapserver will not often make effective
> use of more than 2GB of in process memory except for special activities
> (like render super-tile sized images).  You will however get significant
> benefit from having alot of RAM on a 64bit system even if you only have
> 32bit mapserver's since the operating system can effectively cache more
> material from disk.
>
> Best regards,
> --
> ---------------------------------------+--------------------------------
> ---------------------------------------+------
> I set the clouds in motion - turn up   | Frank Warmerdam,
> warmerdam at pobox.com
> light and sound - activate the windows | http://pobox.com/~warmerdam
> and watch the world go round - Rush    | Geospatial Programmer for Rent
>
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