MDEventWorkspace (file-backed): possible performance improvement

[Janik Zikovsky]

• MDEW cache a list of MDBoxes that need to be saved.
• When enough are accumulated, it saves them all at once.
• However, each box gets saved in sequence, which means that they may need to be relocated to another spot in the file.
• This means that you could get a lot of seeking as you save one block at the start, then relocate another at the end, then back to start, etc.

It would be better to:

• Start by relocating ALL the blocks.
• Keep a sorted list of all the blocks to write sorted by their NEW file location.
• Write them in order of NEW position.

[Nick Draper]

Moved at the end of release 2.2

[Nick Draper]

Moved to milestone 2.4

[Nick Draper]

Moved at the code freeze for release 2.4

[Nick Draper]

Moved to r2.6 at the end of r2.5

[Nick Draper]

Moved to backlog at the code freeze for R2.6

[Nick Draper]

Bulk move to assigned at the introduction of the triage step

[Stuart Campbell]

This ticket has been transferred to github issue ​6221