<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
</head>
<body dir="ltr">
<div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Present: Beyhan, Samuel Cupp, Helvi Witek, Peter Diener, Kenneth Sible, Roland Haas,</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Steven Brandt, Alois Peter Schaffarczyk, Miguel Gracia, Zachariah Etienne,</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Maria Hamilton, Yosef E Zlochower<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Chair: Helvi<br>
</div>
<div id="divtagdefaultwrapper" dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">
Minutes: Samuel<br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"><br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">Chairs and minute takers for next two weeks were decided.<br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">10/8 Meeting<br>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"> Chair: Steve<br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"> Minute taker: Miguel<br>
</div>
<br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"><br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">10/15 Meeting
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"> Chair: Peter<br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"> Minute taker: Roland</div>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"><br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"><br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"><b>SPEC Benchmarks:</b><br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">The Einstein Toolkit submission to the SPEC benchmark was discussed again. The deadline for</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">submission is February 21st, so the code should be submitted before this date. Since this submission</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">date is soon after winter break, the code should be prepared for submission prior to the break if possible.</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">Submission requires a standalone version of the code, which will likely consist of an ML_BSSN McLachlan</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">code.</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"><br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">Roland offered to create an Overleaf document with information on SPEC benchmark submission process,</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">and he will send the link to the document to those on the call, so others can assist with preparation for</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">submission. Erik Schnetter was previously submitted to SPEC, so he will be contacted to provide input</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">on the Toolkit's previous submissions to this program.</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"><br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"><br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"><b>Moving off the Jenkins server:</b></div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">An intern at NCSA is working to port the testing features on Jenkins over to Github Actions. One goal is to move</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">the continuous integration tests to an external system that does not require as much maintenance by Toolkit</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">maintainers. Also, Github should not have the security issues that were present with the Jenkins server. The</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">solutions to these issues prevented Jenkins from being easily accessible to anyone outside of NCSA, so</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">moving to Github should allow the testing and testing results to be more publicly visible.</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"><br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">Currently, the Github port can compile and run the tests. It also caches compiled code so compilation time is</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">minimized. The demo page is available at
<a rel="nofollow" class="external free" href="https://mojamil.github.io/einsteintoolkit/" id="LPlnk780855">
https://mojamil.github.io/einsteintoolkit/</a>. It currently has limited UI</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">and presentability, as the first goal is ensuring functionality. Roland requested input for suggestions and feedback,</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">especially about any features that are missing from the prior testing system or improvements that could be made.</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"><br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">Helvi requested listing the unrunnable tests explicitly on the webpage. Roland explained the cause of most</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">unrunnable tests and suggested adding a clickable UI to show details for those tests.</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"><br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">Another future goal is to provide data from previous tests. The information about old test results is kept; it simply needs</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">to be accessible via this interface.</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"><br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"><br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"><b>Upcoming release:</b></div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">The release still needs a release coordinator (7 weeks till release!). The individual release tasks have been itemized by</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">Roland and Steve, but they haven't yet given estimates for the time commitment for each task. They aim to have this soon</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">so that people will volunteer for these roles. Helvi offered some time and/or students for testing the new release.<br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"><br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"><br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"><b>NRPyPN ticket 2417:</b></div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">This needs to be reviewed for the next release. Peter has begun the process of review and doesn't expect any major issues.</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"><br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"><br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"><b>Postdoc position announcement:</b></div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">Helvi announced a postdoc position with herself and Roland at University of Illinois at Urbana-Champaign.</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">An official solicitation email is pending, and the solicitation is linked below.<br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"><a href="https://hyperspace.uni-frankfurt.de/2020/09/30/postdoctoral-postion-with-focus-on-numerical-relativity-and-strong-field-tests-of-gravity-university-of-illinois-at-urbana-champaign-il-usa/"><span style="text-decoration: underline; color:#0000ff">https://hyperspace.uni-frankfurt.de/2020/09/30/postdoctoral-postion-with-focus-on-numerical-relativity-and-strong-field-tests-of-gravity-university-of-illinois-at-urbana-champaign-il-usa/</span></a>
<br>
</div>
</div>
<div><br>
</div>
<div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"><br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"><b>User questions:</b><br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">Beyhan asked about an error occurring specifically with non-equal mass simulations. The error does not occur with equal mass.<br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">For these simulations, he is using McLachlan + GRHydro. At some point, the lapse goes negative, and this ends the simulation.</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">Zach suggested setting the minimum lapse to a small positive value, though the default setting for this parameter is 0. He also</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">suggested being more conservative with the trigger for adding refinement levels, as they may need to be introduced slightly</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">sooner for accurate data.</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif"><br>
</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">Another suggestion was to check if the horizon finder is the source of the error. If so, having the finder not search until further</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">into the simulation may help. Interpolation early in the simulation may result in values which aren't a problem for the simulation</div>
<div dir="ltr" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">but could cause errors in the horizon finder.<br>
<span style="font-family:Calibri,Helvetica,sans-serif,serif,EmojiFont"><span></span><span id="ms-rterangepaste-end"></span></span></div>
<div id="Signature">
<div>
<div id="divtagdefaultwrapper" dir="ltr" style="font-size:12pt; color:#000000; font-family:Calibri,Helvetica,sans-serif">
<span style="font-family:Calibri,Helvetica,sans-serif,serif,EmojiFont; font-size:16px"></span>
<div id="divtagdefaultwrapper" dir="ltr" style="font-size:12pt; color:#000000; font-family:Calibri,Helvetica,sans-serif">
</div>
</div>
</div>
</div>
</div>
</body>
</html>