SaveMD crashes Mantid when saving large MD files

[Alex Buts]

The following script works fine if one combines 20 (maxNum=20)files, but when there are 100 (maxNum=100), there is crash on SaveMD, somewhere in saving boxes.

print 'start\n'
cur_ws='wsn';
md_ws='mdws4D';
MDWSF='';
LoadNXSPE(Filename='D:/Data/Fe/Fe_Mantid/MAP'+str(15052)+'.nxspe',OutputWorkspace=cur_ws)
maxNum = 20;
for n in range(1,maxNum):
	print "Step: ",n," of ",maxNum
	AddSampleLog(cur_ws,LogName='Psi',LogText=str(2*n),LogType='Number');
	SetGoniometer(cur_ws,Axis0='Psi,0,1,0,1');
	SetUB(Workspace=cur_ws,a='2.87',b='2.87',c='2.87')
	
	ConvertToMD(InputWorkspace=cur_ws,OutputWorkspace=md_ws,QDimensions='Q3D',QConversionScales='HKL',OverwriteExisting='0',MinValues='-4.2,-4.2,-4.2,-50',MaxValues='8.2,8.2,4.2,350')
	

SaveMD(md_ws,'FeFake_025.nxs');

[Nick Draper]

Moved to milestone 2.4

[Alex Buts]

refs #5979 test which shows errors without handling huge files

Changeset: 88b3b7779d959e428c7735ed3b2c70d3800b0a97

[Alex Buts]

refs #5979 This hopefully fixes it

Open data in NeXus has to be always followed by close data.

Changeset: 7350601b1f5ce89531b37714e604c71608186b77

[Alex Buts]

the script below runs faster that the initial one and demonstrates that there are no this error any more (it was crashing on 60 files before)

from mantid import logger

print 'start\n'
cur_ws='wsn';
md_ws='mdws4D';
logger.notice('started combining');
MDWSF='';
LoadNXSPE(Filename='D:/Data/Fe/Fe_Mantid/MAP'+str(15052)+'.nxspe',OutputWorkspace='wsn1')
ConvertUnits(InputWorkspace='wsn1',OutputWorkspace=cur_ws,Target='TOF',EMode='Direct')

maxNum = 80;
maxNname= str(maxNum)
for n in range(0,maxNum):
	logMess = "Step: "+str(n+1)+" of "+maxNname
	print logMess
	logger.notice('started combining');	

	AddSampleLog(cur_ws,LogName='Psi',LogText=str(2*n),LogType='Number');
	SetGoniometer(cur_ws,Axis0='Psi,0,1,0,1');
	SetUB(Workspace=cur_ws,a='2.87',b='2.87',c='2.87')
	
	#ConvertToMD(InputWorkspace=cur_ws,OutputWorkspace=md_ws,QDimensions='Q3D',QConversionScales='HKL',OverwriteExisting='0',MinValues='-4.2,-4.2,-4.2,-50',MaxValues='8.2,8.2,4.2,350')
	
	ConvertToDiffractionMDWorkspace(InputWorkspace=cur_ws,OutputWorkspace=md_ws,Append='1')	

SaveMD(md_ws,'FeFake_Lr80.nxs');

[Michael Reuter]

This seems to be working correctly.

[Alex Buts]

refs #5979 test which shows errors without handling huge files

Changeset: 88b3b7779d959e428c7735ed3b2c70d3800b0a97

[Alex Buts]

refs #5979 This hopefully fixes it

Open data in NeXus has to be always followed by close data.

Changeset: 7350601b1f5ce89531b37714e604c71608186b77

[Alex Buts]

refs #5979 test which shows errors without handling huge files

Changeset: 88b3b7779d959e428c7735ed3b2c70d3800b0a97

[Alex Buts]

refs #5979 This hopefully fixes it

Open data in NeXus has to be always followed by close data.

Changeset: 7350601b1f5ce89531b37714e604c71608186b77

[Stuart Campbell]

This ticket has been transferred to github issue ​6825