On 5 May 2017, at 20:38, Khamesra, Bhavesh <bhaveshkhame...@gatech.edu> wrote:
> Hi Ian, No I do not find any backtrace files in the output directory. 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. > > ............................. > Bhavesh Khamesra > Graduate Student > Centre of Relativistic Astrophysics > Georgia Institute of Technology > From: Ian Hinder <ian.hin...@aei.mpg.de> > Sent: Friday, May 5, 2017 1:13:38 PM > To: Khamesra, Bhavesh > Cc: Erik Schnetter; Einstein Toolkit Users > Subject: Re: [Users] Benchmarking > > > On 5 May 2017, at 18:43, Khamesra, Bhavesh <bhaveshkhame...@gatech.edu> wrote: > >> 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. >> 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? > > Carpet should write a backtrace file into the output directory if there is a > segfault. Do you see backtrace files in > > sim/output-0000/sim/backtrace.*.txt > > ? > > -- > Ian Hinder > http://members.aei.mpg.de/ianhin -- Ian Hinder http://members.aei.mpg.de/ianhin
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