Release the GIL in ITK operations

[mrocklin]

First, a question: Does the ITK Python library release the GIL when it calls down to lower level C/C++ code?

When I run ITK operations within Dask I notice that my servers lock up. The most common cause of this is that some low level code is holding onto the GIL and not letting go. Is it possible that ITK does this?

If ITK does not release the GIL, could it?

xref https://discourse.itk.org/t/parallelize-itk-imageseriesreader-itk-4-12/1745/15

[thewtex]

@mrocklin thanks for the report. We will dive deeper into this.

:xref: #1065 , which was not sufficient.

[blowekamp]

This is how it is done in SimpleITK: https://github.com/SimpleITK/SimpleITK/commit/e9ce7283a7614a92711e1bd2c65866740e4d8a00

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This issue has been automatically marked as stale because it has not had recent activity. Thank you for your contributions.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. Thank you for your contributions.

[mrocklin]

I'd love to keep this alive if we could

On Thu, Jun 10, 2021 at 8:24 PM stale[bot] @.***> wrote:

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[thewtex]

I am wondering if the observed behavior was related to:

https://github.com/InsightSoftwareConsortium/ITK/commit/cfdb5023a82fc61f3825231b257ca47f4d9d4d8a

or

https://github.com/InsightSoftwareConsortium/ITK/issues/2069

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This issue has been automatically marked as stale because it has not had recent activity. Thank you for your contributions.