<div dir="ltr">Thanks a lot, I will try this!<div><br></div><div>best wishes,</div><div><br></div><div>Vassili</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Nov 15, 2013 at 5:39 PM, Roland Haas <span dir="ltr"><<a href="mailto:rhaas@tapir.caltech.edu" target="_blank">rhaas@tapir.caltech.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">-----BEGIN PGP SIGNED MESSAGE-----<br>
Hash: SHA1<br>
<br>
Hello Vassilios,<br>
<br>
</div><div class="im">> and then reduce over all radial shells<br>
><br>
> for(int iradii=0; iradii < nradii; iradii ++) {<br>
> CCTK_Reduce(cctkGH,-1, &rho_total_shell[iradii], CCTK_VAR =<br>
> rho_in_shell[iradii]) }<br>
><br>
> would that be an option? or even work?<br>
</div>Yes, that is essentially option 2 that I had outlined. You need to<br>
modify your first loop to be CCTK_LOOP3_INTBND (described in the user<br>
guide, be careful when trying to use OpenMP since rho_in_shell[iradii]<br>
might see contributions from different threads) so that you exclude<br>
ghost zones. You also have to multiply rhop[i3D] by CarpetReduce's<br>
weight function (easiest is to inherit from CarpetReduce which will<br>
give you access to the grid function). You can do the Reduction all in<br>
one MPI call if you'd like:<br>
<br>
const int op_sum = CCTK_ReductionArrayHandle("sum");<br>
const int ierr = CCTK_ReduceArray(cctkGH,-1, op_sum, nradii,<br>
CCTK_VARIABLE_REAL, rho_total_shell, 1/*num_dims*/,<br>
1/*num_in_arrays*/, CCTK_VARIALBE_REAL, nradii, rho_in_shell);<br>
<br>
or one of of the 1D ArrayToArray helper routines<br>
(CCTK_ReduceLocArrayToArray1D) described in the user guide.<br>
<div class="im"><br>
Yours,<br>
Roland<br>
<br>
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