<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=big5">
<style type="text/css" style="display:none;"><!-- P {margin-top:0;margin-bottom:0;} --></style>
</head>
<body dir="ltr">
<div id="divtagdefaultwrapper" style="font-size:12pt;color:#000000;font-family:Calibri,Helvetica,sans-serif;" dir="ltr">
<p>Hello,</p>
<p>I am using <span>IllinoisGRMHD with the test with nsns_test.par in <a href="https://bitbucket.org/zach_etienne/wvuthorns_diagnostics/src/master/NSNS_parameter_files/" class="OWAAutoLink" id="LPlnk489993" previewremoved="true">https://bitbucket.org/zach_etienne/wvuthorns_diagnostics/src/master/NSNS_parameter_files/</a>
.</span></p>
<p><span>The simulation runs well until t~5300 and an error occurs. The error message is like this:</span></p>
<p><span><br>
</span></p>
<p><span></span></p>
<div>WARNING level 1 from host nid02210 process 0</div>
<div> while executing schedule bin particle_tracerET, routine particle_tracerET::DoOneRK4StepForParticleTracerET</div>
<div> in thorn AEILocalInterp, file /global/u1/c/chlin/et/Cactus/arrangements/Numerical/AEILocalInterp/src/Lagrange-tensor-product/../template.c:1109:</div>
<div> -> </div>
<div> CCTK_InterpLocalUniform():</div>
<div> interpolation point is either outside the grid,</div>
<div> or inside but too close to the grid boundary!</div>
<div> (this may be caused by a global interpolation with</div>
<div> driver::ghost_size too small)</div>
<div> 0-origin interpolation point number pt=0 of N_interp_points=1</div>
<div> interpolation point (x,y,z)=(-157.725,-576.349,-99.2027)</div>
<div> grid x_min(delta_x)x_max = -576(18)576</div>
<div> grid y_min(delta_y)y_max = -576(18)54</div>
<div> grid z_min(delta_z)z_max = -576(18)54</div>
<div><br>
</div>
<div>WARNING level 1 from host nid02210 process 0</div>
<div> while executing schedule bin particle_tracerET, routine particle_tracerET::DoOneRK4StepForParticleTracerET</div>
<div> in thorn particle_tracerET, file /global/u1/c/chlin/et/Cactus/arrangements/WVUThorns_Diagnostics/particle_tracerET/src/Interpolate_velocities_at_particle_positions.C:131:</div>
<div> -> interpolation screwed up</div>
<div>WARNING level 1 from host nid02210 process 1</div>
<div> while executing schedule bin particle_tracerET, routine particle_tracerET::DoOneRK4StepForParticleTracerET</div>
<div> in thorn particle_tracerET, file /global/u1/c/chlin/et/Cactus/arrangements/WVUThorns_Diagnostics/particle_tracerET/src/Interpolate_velocities_at_particle_positions.C:131:</div>
<div> -> interpolation screwed up</div>
<div>srun: error: nid02211: tasks 2-3: Exited with exit code 1</div>
<div>srun: Terminating job step 21753671.0</div>
<div>srun: error: nid02210: tasks 0-1: Exited with exit code 1</div>
<br>
<p></p>
<p><span>I think maybe t can be avoided by decreasing the timestep so that the tracer particle would not move too fast to make the <span style="font-family: Calibri, Helvetica, sans-serif, Helvetica, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;"> interpolation
screwed up but I am not sure. So what I want to ask is :</span></span></p>
<p></p>
<ol style="margin-bottom: 0px; margin-top: 0px;">
<li><span><span style="font-family: Calibri, Helvetica, sans-serif, Helvetica, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;">It this error can be avoided by decreasing the
timestep ?</span></span></li><li><span><span style="font-family: Calibri, Helvetica, sans-serif, Helvetica, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;">If so, how can I d<span style="font-family: Calibri, Helvetica, sans-serif, Helvetica, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;">ecrease
the timestep in parameter file (or in other places)?<br>
<br>
</span></span></span></li></ol>
<div>Thank you.</div>
<div>Best regards,</div>
<div>Chia-Hui</div>
<p></p>
</div>
</body>
</html>