SegFault through nx

[Peter Peterson]

This has happened for both Dennis Mikkelson and Art Schultz, but Pete Peterson and Stuart Campbell have everything work fine. To reproduce run the python script below from a terminal in a nx session

import sys
sys.path.append("/opt/mantidnightly/bin")
#sys.path.append("/opt/Mantid/bin")

from MantidFramework import mtd
mtd.initialise()
from mantidsimple import *

file_name = "/SNS/TOPAZ/IPTS-4822/0/3857/NeXus/TOPAZ_3857_event.nxs"

LoadEventNexus( Filename=file_name, OutputWorkspace='TOPAZ_events', 
                FilterByTofMin='500', FilterByTofMax='16000' )

ConvertToDiffractionMDWorkspace( InputWorkspace='TOPAZ_events', OutputWorkspace='TOPAZ_MDEW',
                                 LorentzCorrection='1', OutputDimensions='Q (lab frame)',
                                 SplitInto='2,2,2', SplitThreshold='50',MaxRecursionDepth='12')

sys.exit()

If you (in the terminal) ssh back to the same machine and run it, the script works.

[Nick Draper]

Moved to milestone 2.4

[Peter Peterson]

The segfault happens randomly during ConvertToDiffractionMDWorkspace, but happens everytime.

Changing the ConvertToDiffractionMD to (the parameters might not be all 'correct' for real use)

ConvertToMD( InputWorkspace='TOPAZ_events', OutputWorkspace='TOPAZ_MDEW',
             LorentzCorrection=True, QDimensions='Q3D',
             dEAnalysisMode='Elastic', QConversionScales='Q in A^-1',
             SplitInto='2,2,2', SplitThreshold='50',MaxRecursionDepth='12',
             MinValues='-15,-15,-15', MaxValues='15,15,15')

does not crash, but does hang roughly 25% of the time. Since ConvertToMD is what people should use in the long term, the effort should be spent making sure that the results of that are correct.

[Peter Peterson]

Since ConvertToDiffractionMDWorkspace is meant to be replaced by ConvertToMD this issue will not be worked on directly. Instead, people should move to using ConvertToMD.

[Vickie Lynch]

This has been fixed with ticket #6385

[Stuart Campbell]

This ticket has been transferred to github issue ​6753