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Re: 20020215: netcdf 3.5.0 ncvarput failure - Cray SV1

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  • Subject: Re: 20020215: netcdf 3.5.0 ncvarput failure - Cray SV1
  • Date: Fri, 15 Feb 2002 12:21:34 -0700
John,

>Date: Fri, 15 Feb 2002 10:09:38 -0900
>From: John Metzner <address@hidden>
>Organization: Arctic Region Supercomputing Center
>To: Steve Emmerson <address@hidden>
>Subject: Re: 20020214: netcdf 3.5.0 ncvarput failure - Cray SV1 
>Keywords: 200202122006.g1CK6Lx24308

The above message contained the following:

> Steve,
>       I did a bit more testing with the nctest code, comparing builds 
> between here at ARSC and inside Cray Corporate.  I was able to get the 
> nctest code to build and run successfully here when I changed the CFLAGS 
> entry in the macros.make file from "-O3" to "-h 
> inline3,scalar3,task1,vector0".
> Also "-O0" would work, but not "-O1" (-O1 is equivalent to -h inline1,scalar1,
> task1,vector1).
>       I found that the versions of C/C++ compilers was slightly different
> between here and the Cray Corporate machine.  We are running version 3.5.0.1
> and the corporate system was 3.5.0.3.  When I changed to the same 3.5.0.1
> compiler on the corporate machine, I got the same failure.  The problem was
> still there when I switched to 3.5.0.2 on the corporate system.  So, Cray 
> made some change to the compiler at 3.5.0.3 which allows nctest to not error
> out on a floating point exception.  

Compiler bug, eh?  Makes sense; we couldn't understand why you were
seeing what you did.

>       You might want to enter this into you problem/fix database in case 
> some other poor Cray soul gets bit by it.

Done.

> Thanks for all your help and 
> quick responses.  It's great to get this kind of support on an open source
> package, pretty rare too.

You're most welcome.  We're glad you found the problem.

> Thanks again,
> John Metzner - Cray, Inc                          address@hidden
> Arctic Region Supercomputing Center               address@hidden
> 910 Yukon Drive Rm. 106E                          Phone: (907)474-5431
> Fairbanks, AK 99775-6020                          FAX:   (907)474-1820

Regards,
Steve Emmerson   <http://www.unidata.ucar.edu>