All pixel data threads hang per batch until all complete

[joshmoore]

In addition to #80, image.sc user JulianHn points out

no new threads are started until all the original threads complete operation. This of course is a problem, if the batch of 6 images take very different times to process. Is this behaviour normal or did I configure something wrong?

see: https://forum.image.sc/t/pixeldata-pyramid-creation-does-not-multithread-correctly/49093

[imagesc-bot]

This issue has been mentioned on Image.sc Forum. There might be relevant details there:

https://forum.image.sc/t/pixeldata-pyramid-creation-does-not-multithread-correctly/49093/6

[imagesc-bot]

This issue has been mentioned on Image.sc Forum. There might be relevant details there:

https://forum.image.sc/t/pixeldata-threads-and-pyramid-generation-issues/49794/2

[imagesc-bot]

This issue has been mentioned on Image.sc Forum. There might be relevant details there:

https://forum.image.sc/t/pixeldata-threads-and-pyramid-generation-issues/49794/9

[imagesc-bot]

This issue has been mentioned on Image.sc Forum. There might be relevant details there:

https://forum.image.sc/t/omero-pyramid-generation-time/33463/22

[chris-allan]

Since this is related to #80, #125, and #154 bringing it into the mix.