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<p>Hello,<br>
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<p>I am using the Marshall University BigGreen cluster to run a parameter file with 5 Carpet time levels, on a 200^3 spatial domain, starting with d(x,y,z)_coarse = 1, and dtfac = 0.03125. </p>
<p>The total necessary memory looks to be somewhere around 40 GB. <br>
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<p>My aim is to run it up to t=200, but I have a time limit on cluster of 72 hours. </p>
<p>I was thinking, naively, that if I increase the number of processes, the run will go faster. However, this was not the case. </p>
<p>I did an experiment, where I used first <span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);">
48 procs</span>, then 96 procs, and in 72 hours, the <span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);">48 procs</span> run stopped at t = 55.25, while the <span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);">96
procs</span> run stopped ash 48.50.</p>
<p>That obviously did not work, so I tried next to decrease the time refinement. <br>
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<p>For the same <span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);">48 procs</span>, the run with bigger time step <span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);">dtfac
= 0.0625</span> stopped ash t = 54.17 after 72 hours. <br>
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<p><span style="font-size: 12pt;">I would very much appreciate if I can get an explanation of what is happening, and how to get to speed up the run, so that it will get finished in the time constraint of 72 hours that is imposed to me.</span></p>
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</span></p>
<p><span style="font-size: 12pt;"></span><font size="3">I am </font>attaching the parameter file and the SLURM script I am using to run it.</p>
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<p><font size="3">thanks,</font></p>
<p><font size="3">Maria​ </font><span style="font-size: 12pt;"> </span><br>
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<div dir="ltr">_______________________</div>
<div dir="ltr"><font size="2"><i>Dr. Maria C. Babiuc Hamilton</i></font></div>
<div dir="ltr"><font size="2"><i>Department of Physics</i></font></div>
<div dir="ltr"><font size="2"><i>Marshall University</i></font></div>
<div dir="ltr"><font size="2"><i>S257 Science Building</i></font></div>
<div dir="ltr"><font size="2"><i>Huntington, WV, 25755</i></font></div>
<div dir="ltr"><font size="2"><i>Phone: (304)696-2754</i></font></div>
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