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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Just to add to this discussion, when visualizing files from FLASH, you can run into memory issues with visit depending on the simulations size. With the basic
file formats available I have not found a way to split them up efficiently over many processors when visualizing. So, for me the plot files can be a way to efficiently run data analysis using visit on large simulations because of their smaller size. I suggest
dumping chk files on exit for restarting and then dumping plot files more often for visualization.
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</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Jacob<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> flash-users-bounces@flash.uchicago.edu [mailto:flash-users-bounces@flash.uchicago.edu]
<b>On Behalf Of </b>John ZuHone<br>
<b>Sent:</b> Wednesday, January 18, 2017 2:04 PM<br>
<b>To:</b> Marissa Adams <madams@pas.rochester.edu><br>
<b>Cc:</b> flash-users <flash-users@flash.uchicago.edu><br>
<b>Subject:</b> Re: [FLASH-USERS] Checkpoint files vs. Plot files<o:p></o:p></span></p>
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<p class="MsoNormal">Hi Marissa,<o:p></o:p></p>
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<p class="MsoNormal">The main reason why one would want to dump plotfiles more frequently and use them in analysis is disk space. Checkpoint files dump _everything_—every grid variable, all the particles, and all of the metadata. Though you may want all the
metadata, you may not want all of the grid variables—most simulations have extra variables that you likely will not use in analysis (e.g., do you really need both "eint" and "ener" to do analysis, even though the code does for evolution? Probably not). <o:p></o:p></p>
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<p class="MsoNormal">Plotfiles give you the ability to dump only the variables you will use in analysis more frequently than checkpoints, which are (as you said) usually thought to be only for restarts. You can also dump particle files. I typically dump both
plotfiles and particle files at the same cadence. In the end, you will likely save a lot of disk space if you use plotfiles and particle files. <o:p></o:p></p>
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<p class="MsoNormal">Best,<o:p></o:p></p>
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<p class="MsoNormal">John<o:p></o:p></p>
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<p class="MsoNormal">On Jan 18, 2017, at 2:58 PM, Marissa Adams <<a href="mailto:madams@pas.rochester.edu">madams@pas.rochester.edu</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">Hi all,<br>
<br>
I am wonder if there is an advantage to using <i>plt</i> files in comparison to <i>
chk</i> files as I am considering just using <i>chk</i> for primary output. I want to make sure I am not losing any physics by doing so.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">The documentation clearly alludes to
<i>chk</i> files being necessary for restarts. One can make the </span><span style="font-family:"Courier New"">plotfileIntervalTime = checkpointFileIntervalTime</span><span style="font-family:"Arial",sans-serif">, as well as have one be < and > the other, and
the code still runs.</span><br>
<br>
<span style="font-family:"Arial",sans-serif">I also considered if perhaps plot/refinement variables specified in a
<i>flash.par</i> would not necessarily be there -- all the information is there, as to be expected (re: restarts).<br>
<br>
I suppose my questions can be well defined as, aren't <i>plt</i> files a little redundant if checkpoint files are sufficient, and contain more information (for restarts, particles, etc)? Are
<i>plt</i> files more easily handled in some visualization software other than VisIt and yt (since checkpoint files are handled just fine there)?<br>
<br>
Best,<br>
Marissa</span><o:p></o:p></p>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Courier New"">Marissa Adams E-mail: <a href="mailto:madams@pas.rochester.edu" target="_blank">madams@pas.rochester.edu</a><br>
PhD Student Ph: (585) 402-5779</span><span style="font-size:9.5pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Courier New"">University of Rochester Website: <a href="http://www.pas.rochester.edu/~madams/" target="_blank">http://www.pas.rochester.edu/~madams/</a></span><span style="font-size:9.5pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Courier New"">Department of Physics & Astronomy</span><span style="font-size:9.5pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Courier New"">108 Bausch & Lomb Hall<br>
P.O. Box 270171</span><span style="font-size:9.5pt"><o:p></o:p></span></p>
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