ExportSampleLogsToCSVFile performance

[OwenArnold]

This issue was originally TRAC 11537

This algorithms really struggles for exporting time series logs that contain a large number of entries. Conversely if I try to export the log table as a table in MantidPlot and save it to disk it's almost instantaneous so there must be a way to get this operation faster.

I was trying this with a workspace that contained a time series log with something of the order of 1E6 entries.

The following need to be fixed.

• There is no progress reporting
• The algorithm execution locks-up the whole of MantidPlot
• The execution time is far too long. I force quit MantidPlot after about 5 minutes.

Would be nice if this was fixed for 3.4 because we have users who want to export large time series logs as part of their experiment.

[OwenArnold]

@wdzhou (2015-05-05T14:15:16):
The algorithm is written in python now and was not targeted for time series log with huge size. In order to improve the performance, this algorithm should be re-written in c++.

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@wdzhou (2015-05-08T18:37:18):
Refs http://trac.mantidproject.org/mantid/ticket/11537. Created new files in c++.

4287a67

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@wdzhou (2015-05-14T03:46:06):
Checkpointing the start of implementation. Refs http://trac.mantidproject.org/mantid/ticket/11537.

2daa000

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@wdzhou (2015-05-14T03:46:07):
Checkpointing progress of translation work. Refs http://trac.mantidproject.org/mantid/ticket/11537.

18d873d

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