Dear Hee Il,
I agree that getting this right is tricky. You must set up your grid functions that you want to reduce in MoL_PseudoEvolution in local mode, then do the reduction in CCTK_Analysis in global mode.
I am attaching a Thorn called ZelmaniAnalysis that I use for the kinds of things you want. The reduction works with Carpet.
Best,
- Christian
On Wed, Jan 05, 2011 at 09:18:21PM +0900, Hee Il Kim wrote:
Hi,
Belated Happy New Year !
I am writing a simple code for the calculation of ADM mass and angular momentum by using ML_ADMQuantities. As you know, it requires reduction procedure for the summation of the integrand, e.g., density * volume measure. I've tried various reduction APIs including old deprecated one, but I could only succeed in the integration only over the coarsest grid level, which was not accurate.
If I use the new reduction API in the reference manual of Cactus, CCTK_ReduceGridArrays;
CCTK_ReduceGridArrays(const cGH *GH, int dest_processor, int local_reduce_handle, int param_table_handle, int N_input_arrays, const CCTK_INT input_array_variable_indices[], int M_output_values, const CCTK_INT output_value_type_codes[], void* const output_values[]);
, I encounter the following error .... WARNING[L3,P0] (Cactus): CCTK_ReduceGridArrays: no grid array reduction registered WARNING level 0 in thorn ML_Analysis processor 0 host compute-0-5.local (line 159 of Evaluate_ADMQuantities.F90): -> Failed to integrate J_z
Param_table_handle is not clear to me but it seems not causing the problem. The reduction operators are registered by CactusBase/LocalReduce.
Could you let me know which reduction function I have to use for this calculation? I mean the integration over the whole grid levels. Should I do loop over refinenment levels; ... do loop over reflev call CCTK_Reduce enddo ...
Thanks in advance,
Hee Il
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