<div dir="auto">Thanks! </div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Aug 28, 2020, 6:34 AM Roland Haas <<a href="mailto:rhaas@illinois.edu">rhaas@illinois.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello Bilal,<br>
<br>
> Thanks Sir. But I am still confused about, why changing "itlast" generated<br>
> that issue as it only controls "last iteration"?<br>
Changing itlast to > 0 makes Cactus enter an evolution loop where it<br>
will cycle time levels bringing fresh, unitialized time levels to the<br>
top of the set of time levels. Since there is nothing that would evolve<br>
the data or re-initialize the timelevels your are left with unitialized<br>
time levels, i.e. NaNs.<br>
<br>
Just to be explicit: iteration is not some sort of iteration in a<br>
non-linear solver. It is (more or less) the time step of a hyperbolic<br>
evolution.<br>
<br>
If you want more multigrid (W, V, whatnot) cycles then you have to<br>
change CT_MultiLevel's parameters. I would suggest having a look at<br>
param.ccl of CT_MultiLevel to see which ones are available.<br>
<br>
Yours,<br>
Roland<br>
<br>
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</blockquote></div>