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<p>Hi Ian, The segfault was mentioned in the error file, you can find the complete error in it (Attached here). </p>
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<p><span style="color: rgb(33, 33, 33); font-family: wf_segoe-ui_normal, 'Segoe UI', 'Segoe WP', Tahoma, Arial, sans-serif; font-size: 15px;"><b>It's possible that the segfault is not in Cactus</b></span><br>
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<p>Yes, I completely agree. The error does not refer to any Cactus file and hence I wasn't sure what is the cause of it. </p>
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<p>Thanks,</p>
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<p><span style="font-family:Calibri,Arial,Helvetica,sans-serif">.............................</span></p>
<span style="font-family:Calibri,Arial,Helvetica,sans-serif"></span>
<p><span style="font-family:Calibri,Arial,Helvetica,sans-serif">Bhavesh Khamesra</span></p>
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<p><span style="font-family:Calibri,Arial,Helvetica,sans-serif">Graduate Student</span></p>
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<p><span style="font-family:Calibri,Arial,Helvetica,sans-serif">Centre of Relativistic Astrophysics</span></p>
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<p><span style="font-family:Calibri,Arial,Helvetica,sans-serif">Georgia Institute of Technology</span></p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Ian Hinder <ian.hinder@aei.mpg.de><br>
<b>Sent:</b> Saturday, May 6, 2017 3:58:46 AM<br>
<b>To:</b> Khamesra, Bhavesh<br>
<b>Cc:</b> Erik Schnetter; Einstein Toolkit Users<br>
<b>Subject:</b> Re: [Users] Benchmarking</font>
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<div>On 5 May 2017, at 20:38, Khamesra, Bhavesh <<a href="mailto:bhaveshkhamesra@gatech.edu">bhaveshkhamesra@gatech.edu</a>> wrote:</div>
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<div style="margin-top: 0px; margin-bottom: 0px;">Hi Ian, No I do not find any backtrace files in the output directory. </div>
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<div>How do you know that there is a segfault? Can you post the error message? It's possible that the segfault is not in Cactus - e.g. it could be from mpirun or some other part of the system. If Cactus aborts with a segfault, and the run is using Carpet
as the driver (i.e. the Carpet thorn is active in the parameter file), then it should write a backtrace file. </div>
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<div style="margin-top: 0px; margin-bottom: 0px;"><span style="font-family: Calibri, Arial, Helvetica, sans-serif;">Bhavesh Khamesra</span></div>
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<div style="margin-top: 0px; margin-bottom: 0px;"><span style="font-family: Calibri, Arial, Helvetica, sans-serif;">Graduate Student</span></div>
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<div style="margin-top: 0px; margin-bottom: 0px;"><span style="font-family: Calibri, Arial, Helvetica, sans-serif;">Centre of Relativistic Astrophysics</span></div>
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<div style="margin-top: 0px; margin-bottom: 0px;"><span style="font-family: Calibri, Arial, Helvetica, sans-serif;">Georgia Institute of Technology</span></div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size: 11pt;"><b>From:</b><span class="Apple-converted-space"> </span>Ian Hinder <<a href="mailto:ian.hinder@aei.mpg.de">ian.hinder@aei.mpg.de</a>><br>
<b>Sent:</b><span class="Apple-converted-space"> </span>Friday, May 5, 2017 1:13:38 PM<br>
<b>To:</b><span class="Apple-converted-space"> </span>Khamesra, Bhavesh<br>
<b>Cc:</b><span class="Apple-converted-space"> </span>Erik Schnetter; Einstein Toolkit Users<br>
<b>Subject:</b><span class="Apple-converted-space"> </span>Re: [Users] Benchmarking</font>
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<div>On 5 May 2017, at 18:43, Khamesra, Bhavesh <<a href="mailto:bhaveshkhamesra@gatech.edu">bhaveshkhamesra@gatech.edu</a>> wrote:</div>
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<span><b>I have heard of such a segfault before. I assume it is caused by using too many processes or too many threads for a particular resolution. I have not yet reproduced it, and I don't know what causes it. It would be helpful if you could produce a stack
backtrace or similar. On the other hand, if this segfault only appears for very inefficient configurations, then there is no urgent need to debug this, as people won't be interested in using such configurations anyway.<br>
</b>I do not think that it is caused by using too many processors. I tried it with varying number of cores from 68 (insufficient) to 204 but get the same error. Also, I am getting this error with all my BBH parameter files I have tried, so its kind of important.
Is there a way to produce backtrace file using simfactory?<span class="Apple-converted-space"> </span><br>
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<div>Carpet should write a backtrace file into the output directory if there is a segfault. Do you see backtrace files in</div>
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<div style="margin: 0px; font-family: Menlo;">sim/output-0000/sim/backtrace.*.txt</div>
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<div>?</div>
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<div>Ian Hinder</div>
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<div>Ian Hinder</div>
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