[Halld-offline] Fwd: r7587 - trunk/sim-recon/src/libraries/TRACKING

[Curtis A. Meyer]

Hi David -

     does it make sense to open a "general ticket" in Mantis about the 
more general
affects of this issue?

   Curtis
On 3/17/11 11:23 AM, David Lawrence wrote:
>
> Hi All,
>
>     I've just committed a fix to the seg. fault/hang problem based on 
> Richard's analysis. This is slightly different than the fix Richard 
> suggested. It avoids the 80bit/64bit comparison issue by 
> pre-calculating the values to be compared rather than doing it in the 
> sort algorithm itself. This should also speed things up a little since 
> DVector3::Perp() is not being called repeatedly during the sort for 
> the same object.
>
>     I have been able to run through my one reliably-problematic event 
> using the new code without any problem. If anyone notices an issue, 
> please let me know.
>
>     This problem has been marked as resolved in Mantis.
>
> Regards,
> -David
>
> -------- Original Message --------
> Subject: 	r7587 - trunk/sim-recon/src/libraries/TRACKING
> Date: 	Thu, 17 Mar 2011 11:16:40 -0400
> From: 	Hall-D.SVN.Repository at jlab.org
> To: 	davidl at jlab.org, brash at pcs.cnu.edu, wolin at jlab.org, 
> zisis at uregina.ca, mashephe at indiana.edu, remitche at indiana.edu, 
> zihlmann at jlab.org, somov at jlab.org, staylor at jlab.org
>
>
>
> Author: davidl
> Date: 2011-03-17 11:16:39 -0400 (Thu, 17 Mar 2011)
> New Revision: 7587
>
> Modified:
>     trunk/sim-recon/src/libraries/TRACKING/DTrackCandidate_factory_CDC.cc
> Log:
> This is a fix for the seg. fault/hang problem that has been plaguing us
> for the last ~4 months. It precalculates the values used in the comparison
> in the SortIntersections routine to avoid issues with values calculated
> with 80bit precision being compared with values having been copied to and
> from a 64bit register. See the report on the GlueX wiki here:
>
> http://www.jlab.org/Hall-D/software/wiki/index.php/Diagnosing_segmentation_faults_in_reconstruction_software
>
>
>
> _______________________________________________
> Halld-offline mailing list
> Halld-offline at jlab.org
> https://mailman.jlab.org/mailman/listinfo/halld-offline


-- 
Prof. Curtis A. Meyer		Department of Physics
Phone:	(412) 268-2745		Carnegie Mellon University
Fax:	(412) 681-0648		Pittsburgh PA 15213-3890
cmeyer at ernest.phys.cmu.edu	http://www.curtismeyer.com/


-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://mailman.jlab.org/pipermail/halld-offline/attachments/20110317/2626a02c/attachment.html