{"id":355348,"date":"2024-03-05T09:04:47","date_gmt":"2024-03-05T09:04:47","guid":{"rendered":"\/forum\/forums\/topic\/question-regarding-the-auto-shut-off-in-fdtd-simulation\/"},"modified":"2024-03-05T09:40:27","modified_gmt":"2024-03-05T09:40:27","slug":"question-regarding-the-auto-shut-off-in-fdtd-simulation","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/question-regarding-the-auto-shut-off-in-fdtd-simulation\/","title":{"rendered":"Question regarding the auto shut off in FDTD simulation."},"content":{"rendered":"

I had a structure and I want to run the simulation on that structure in the FDTD. <\/p>\n

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I use the default auto shut off value which is 1e-05, I use gaussian source with 638nm, and when I tried to run the simulation, <\/p>\n

I got this for the log <\/p>\n

 <\/div>\n
Estimate of memory required: 1.08786e+10 bytes<\/div>\n
number of processors is 16<\/div>\n
processors are distributed as: 4x4x1<\/div>\n
Peak memory used by end of initialization: 7579837 kB<\/div>\n
Running 3D Simulation<\/div>\n
Starting meshing<\/div>\n
Simulation size in gridpoints: 388 x 388 x 70<\/div>\n
Refined 0 mesh cells (0%)<\/div>\n
Completed meshing!<\/div>\n
Meshing complete in 4.35938 seconds of CPU time<\/div>\n
38336 38336<\/div>\n
Starting meshing<\/div>\n
Simulation size in gridpoints: 388 x 388 x 70<\/div>\n
Refined 0 mesh cells (0%)<\/div>\n
Completed meshing!<\/div>\n
Meshing complete in 4.23438 seconds of CPU time<\/div>\n
38376 38376<\/div>\n
Starting meshing<\/div>\n
Simulation size in gridpoints: 388 x 388 x 70<\/div>\n
Refined 0 mesh cells (0%)<\/div>\n
Completed meshing!<\/div>\n
Meshing complete in 4.23438 seconds of CPU time<\/div>\n
76248 76248<\/div>\n
finished material properties<\/div>\n
Meshing Time: 17.3542 seconds, Init Electrical Material Time: 3.58265 seconds, Init Magnetic Material Time: 0.0525491<\/div>\n
Using selected optimization level: 2<\/div>\n
Selecting 3d kernel for splitFieldDirection=0 and optLevel=2<\/div>\n
—————————————–<\/div>\n
Beginning initialization of 3D Simulation<\/div>\n
Starting to add sources to simulation<\/div>\n
Adding 3D Gaussian source propagating in Z<\/div>\n
Starting to add boundary conditions to simulation<\/div>\n
Adding 3D PML BC<\/div>\n
Adding 3D Parallel BC<\/div>\n
Adding 3D PML BC<\/div>\n
Adding 3D Parallel BC<\/div>\n
Adding 3D PML BC<\/div>\n
Adding 3D PML BC<\/div>\n
Starting to add monitors to Simulation<\/div>\n
Adding analysis monitor<\/div>\n
Adding analysis monitor<\/div>\n
Adding 3D DFT monitor<\/div>\n
Finished initialization of 3D Simulation<\/div>\n
—————————————–<\/div>\n
Peak memory used by end of meshing: 8611577 kB<\/div>\n
All processes are communicating and ready to proceed to simulation…<\/div>\n
Starting 35123 total iterations<\/div>\n
0.0683311% complete. Elapsed simulation time: 6.83311e-16 secs. Max time remaining: 14 hrs, 3 mins, 47 secs. Auto Shutoff: 1<\/div>\n
0.384362% complete. Elapsed simulation time: 3.84362e-15 secs. Max time remaining: 25 hrs, 42 mins, 57 secs. Auto Shutoff: 1<\/div>\n
0.885457% complete. Elapsed simulation time: 8.85457e-15 secs. Max time remaining: 20 hrs, 26 mins, 16 secs. Auto Shutoff: 1<\/div>\n
1.58016% complete. Elapsed simulation time: 1.58016e-14 secs. Max time remaining: 16 hrs, 35 mins, 3 secs. Auto Shutoff: 1<\/div>\n
2.38874% complete. Elapsed simulation time: 2.38874e-14 secs. Max time remaining: 14 hrs, 17 mins, 29 secs. Auto Shutoff: 1<\/div>\n
2.94108% complete. Elapsed simulation time: 2.94108e-14 secs. Max time remaining: 14 hrs, 18 mins, 5 secs. Auto Shutoff: 0.00124913<\/div>\n
3.31975% complete. Elapsed simulation time: 3.31975e-14 secs. Max time remaining: 15 hrs, 3 mins, 58 secs. Auto Shutoff: 0.000178878<\/div>\n
3.71266% complete. Elapsed simulation time: 3.71266e-14 secs. Max time remaining: 15 hrs, 34 mins, 59 secs. Auto Shutoff: 8.52056e-05<\/div>\n
4.10271% complete. Elapsed simulation time: 4.10271e-14 secs. Max time remaining: 15 hrs, 59 mins, 40 secs. Auto Shutoff: 4.50694e-05<\/div>\n
100% complete. Max time remaining: 0 mins, 0 secs. Auto Shutoff: 8.59409e-06<\/div>\n
Early termination of simulation, the autoshutoff criteria are satisfied.<\/div>\n
Completed 1545 iterations, or 4.398813e-14s of Simulation Time<\/div>\n
Peak memory used running the simulation: 8611577 kB<\/div>\n
Process 0 starting to collect data<\/div>\n
    collecting monitor data<\/div>\n
    collecting source data<\/div>\n
Finished collecting data<\/div>\n
Simulation completed successfully at: \u9031\u4e8c \u4e09\u6708 5 12:16:09 2024<\/div>\n
Peak memory used in the simulation: 8611577 kB<\/div>\n
Overall wall time measurements in seconds: 2953.92<\/div>\n
    time to mesh and initialize: 98.3486<\/div>\n
    time to run FDTD simulation: 2724.54<\/div>\n
    time to checkpoint simulation: 0<\/div>\n
    time to finalize data and save to files: 61.6558<\/div>\n
    miscellaneous time: 69.375<\/div>\n
    FDTD solver speed on process 0: 5.9758 Mnodes\/s<\/div>\n
    total FDTD solver speed on 16 processes: 95.6128 Mnodes\/s<\/div>\n

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it went from +- 4% into 100% directly or auto shut off, is it normal? and will it suffice for the simulation, I mean will it affected the output of the simulation, because right now I want to use that simulation to fetch the far field image from the monitor above the structure that I want to see and analyze the reflect of the wavelengths diffraction here. <\/p>\n

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Could someone help me explain this situation that I’ve encountered? And if there is anything or any information that you need for the explanation, feel free to ask me, as long as I can provide it.<\/p>\n

PS: should I increase or decrease the auto shutoff value?<\/p>\n

Thank you for the kind support. <\/p>\n","protected":false},"template":"","class_list":["post-355348","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t