[Users] Code failure apparently due to changes in Reduction.c

[Yosef Zlochower]

Thanks Roland,

We were using Carpet and the actual call was to

CCTK_ReduceLocArrayToArray1D

Is this valid in Carpet?

On 8/17/21 12:59 PM, Roland Haas wrote:
> Hello Yosef,
>
> there's a couple different reduction interfaces and the handle you get
> must match.
>
> It depends a bit on the drive you are using.
>
> Carpet only supports the "old style" reduction interface that uses:
>
> CCTK_Reduce
> CCTK_ReductionHandle
>
> CCTK_ReduceLocalScalar
> CCTK_ReductionArrayHandle
> and:
> CCTK_ReduceArray
> CCTK_ReduceLocalArray1D
>
> it does not support the new interface CCTK_LocalArrayReductionHandle at
> all.
>
> PUGH supports the new one and (I think) the old one as well. The new
> one uses:
>
> CTK_LocalArrayReductionHandle
> CCTK_ReduceLocalArrays
>
> See
> https://www.einsteintoolkit.org/referencemanual/ReferenceManual.html#x1-1000A and search for A488.
>
> So are you using this with PUGH or Carpet? With Carpet it must fail (not
> supported at all), with PUGH it should work as long as you sue the
> correct set of calls ie CCTK_LocalArrayReductionHandle +
> CCTK_ReduceLocalArrays (for PUGH only).
>
> Yours,
> Roland
>
>> Hi,
>>
>>    A code that we are using seems to no longer work with Cactus. The
>> issue seems to be that the code called CCTK_LocalArrayReductionHandle.
>> The code, as checked out, produces errors because the appropriate handle
>> isn't found. If I modify the function as below,  I no longer get the
>> error message
>>
>>
>>
>> int CCTK_LocalArrayReductionHandle(const char *reduction)
>> {
>>     int handle;
>>
>>
>>     handle = Util_GetHandle(LocalArrayReductionOperators, reduction, NULL);
>>     if (handle < 0)
>>     {
>>       CCTK_VWarn(1,__LINE__,__FILE__,"Cactus",
>>                  "CCTK_LocalArrayReductionHandle: No handle: '%d' found
>> for reduction operator "
>>                  "'%s'", handle, reduction);
>>     }
>>
>>     handle += ARRAY_OPERATOR_HANDLE_OFFSET; //// MY changes
>>
>>     return handle;
>> }
>>
>>
>> Should we no longer use CCTK_LocalArrayReductionHandle?
>>
>
>
-- 
Dr. Yosef Zlochower
Center for Computational Relativity and Gravitation
Associate Professor
School of Mathematical Sciences
Rochester Institute of Technology
85 Lomb Memorial Drive
Rochester, NY 14623

Office:74-2067
Phone: +1 585-475-6103

yosef at astro.rit.edu

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