Instrument view leak 1

[AnthonyLim23]

The instrument view has at least 1 memory leak. Identifying any further leaks will be difficult until this one is fixed.

Describe the bug Open Mantid and make a note of the memory usage. Run the script:

from mantid.simpleapi import *
import matplotlib.pyplot as plt
import numpy as np

for i in range(51909,51915):
    LoadRaw(Filename='/archive/NDXWISH/instrument/data/cycle_22_2/WISH000'+str(i)+'.raw', OutputWorkspace=str(i))
    CropWorkspace(InputWorkspace=str(i), OutputWorkspace=str(i), XMin=6000, XMax=99900)
    ConvertUnits(InputWorkspace=str(i), OutputWorkspace=str(i), Target='Wavelength')

Clear the ADS, notice that the memory usage has (more or less) returned to normal Run the script again Open instrument view on one of the WS's (doesnt matter which) Close instrument view Clear the ADS Notice that the memory usage has gone up (on IDAas I saw an increase from 3.5 to 27) -->

Expected behavior

Screenshots

Platform/Version (please complete the following information):

• OS: [e.g. Windows, RHEL 7, Ubuntu, macOS]
• OS Version:
• Mantid Version [e.g. 6.0.0]

Additional context

[thomashampson]

I can reproduce this on Windows. However if I do something else after clearing the workspaces, Mantid will hang for a bit and the memory will return back to the expected usage. The something else can be, e.g.:

• open the file loading dialog
• open an algorithm dialog

[AnthonyLim23]

that is strange! Does that mean the leak is elsewhere?

[thomashampson]

Two other things I've noticed:

• I don't think you need to run the algorithms, just opening and closing the instrument viewer is enough
• If you delete the ws using the "Delete" button, all is fine. If you use the "Clear" button, that will be problematic.

I can reproduce this with the SXD dataset in the training course data, which saves a bit of time when testing.

[thomashampson]

For some reason I can only reproduce this in the latest release version (6.4) and not in the nightly.

[sf1919]

Has anyone tried to reproduce this since v6.4?