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WIP: Memory map files in disk storage

Richard Kennedy requested to merge richken/mmap_file into master

Before raising this MR, consider whether the following are required, and complete if so:

  • Unit tests
  • Metrics
  • Documentation update(s)

If not required, please explain in brief why not.

Description

Memory map files for buildgrid disk storage. This should increase read performance (we will be able to leverage the OS's paging algorithm to manage our memory). This approach seems to also be used in buildbarn for their local disk storage.

This MR is still experimental, suggestions are welcome though!

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