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20050114: LDM on 64-bit Linux

Arthur,

> To: address@hidden
> From: "Arthur A. Person" <address@hidden>
> Subject: LDM on 64-bit Linux
> Organization: UCAR/Unidata
> Keywords: 200501131927.j0DJRtv2019574

The above message contained the following:

> I'm exploring the possibility of setting up a 64-bit Linux hardware 
> platform here on which to run the LDM and I have a few questions:
> 
>      1)  Does the LDM build out-of-the-box on 64-bit hardware/64-bit Linux
>          (I guess that would be the 2.6 kernel) systems?

Yes.  See

    
http://my.unidata.ucar.edu/content/software/ldm/ldm-6.1.0/basics/platform.html#development

for a list of systems on which we have successfully built and installed
the LDM package.

>      2)  Will I be able to use large product queues, as a result (e.g. > 8
>          GB)... is there any queue size limit?

Yes.  On such a system, longs, pointers, and the "off_t" type are all 64
bits by default, which, basically, means that the product-queue can be
any size you want.

>      3)  Have you tested any systems running 64-bit OS/LDM and would you
>          have any recommendations for hardware?

The "x86_64" system in the above URL contains dual-processor AMD Opterons.

We don't have a 64-bit Intel Itanium system.

>      4)  Any problems/bugs that you are aware of?  Can such a system be
>          used operationally?  Any other considerations?

We have run the LDM on the previously-mentioned 64-bit Linux system.
We've experienced some problems with it under high load but, otherwise,
it's worked OK.

Tom might have more to say.

> 
>                                      Thanks.
> 
>                                        Art.
> 
> Arthur A. Person
> Research Assistant, System Administrator
> Penn State Department of Meteorology
> email:  address@hidden, phone:  814-863-1563

Regards,
Steve Emmerson

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