On Jun 14, 2012, at 12:01 PM, Vassilios Mewes wrote:
Hello all,
when using the AHFinderDirect thorn in a simulation of a relativistic wind past a TOV neutron star, i get the following error message:
INFO (AHFinderDirect): proc 0: searching for horizon 1/1 [1mWARNING level 0 in thorn AHFinderDirect processor 0 host permeability.daa.uv.es (line 78 of /Users/vass/programs/Cactus/arrangements/EinsteinAnalysis/AHFinderDirect/src/jtutil/error_exit.cc): ->[0m ***** row_sparse_Jacobian__UMFPACK::solve_linear_system(): error return status=1 from umfpack_numeric() routine
is that an indication that umfpack is not installed correctly (i was never prompted to install it manually and the compilation of the Einstein toolkit [Maxwell release] went on smoothly without any errors), or rather that something is wrong trying to find the horizon? (there should be an horizon, because the lapse goes to 0 fairly quickly, after which the simulation eventually crashes)
Hi Vassili,
this error usually comes up when the arguments to umfpack_numeric() are not numbers (as would happen, for instance, if the metric had become singular). Could you check that your 3+1 variables are finite? Thorn NaNChecker could help you do that.
Eloisa