[3827] Load and save documents in parallel

[pcdavid]

Bug: #3827
Signed-off-by: Pierre-Charles David pierre-charles.david@obeo.fr

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[pcdavid]

With the new version, which uses parallel streams (and thus the underlying ForkJoinPool) for both loading & saving, I get the following results on my machine (12th Gen Intel® Core™ i7-12700H × 20, OpenJDK Runtime Environment Temurin-17.0.4+8).

Each time the scenario is the same:

• Open/load a "Sirius Web (1.3M)" project which is a synthetic project with the "Sirius Web" Papaya example copied 10 times (so it's a "good" use case here as the 1.3M elements are split across 230 resources).
• Note the time taken to load the whole editing context.
• Expand the first semantic element in the Explorer, edit its name in the Details view, and validate.
• Note the time taken to save the whole editing context.

In each of the 3 settings tested, the VM is restarted and the scenario repeated 3 times to allow for some warmup. Only the times of the last iteration is reported.

Sequential (warm):

• Loading: 13.12s (1309800 objects have been loaded in 13123 ms)
• Saving: 11.04s (Editing context d90b1ea7-2eaf-45db-8107-fe8699e993b1 saved in 11042 ms)

Parallel (java.util.concurrent.ForkJoinPool.common.parallelism=8; warm)

• Loading: 8.49s (1309800 objects have been loaded in 8490 ms)
• Saving: 4.96s (Editing context d90b1ea7-2eaf-45db-8107-fe8699e993b1 saved in 4966 ms)

Parallel (java.util.concurrent.ForkJoinPool.common.parallelism=20; warm)

• Loading: 7.25s (1309800 objects have been loaded in 7255 ms)
• Saving: 5.18s (Editing context d90b1ea7-2eaf-45db-8107-fe8699e993b1 saved in 5184 ms)