Delay creation of Truffle nodes for function bodies

[wdanilo]

This task is automatically imported from the old Task Issue Board and it was originally created by Michael Mauderer.
Original issue is here.

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Why

As Enso user
**I want the backend engine to defer unnecessary processing of my and standard library sources **
**So that my new and/or existing Enso project is ready faster and the backend engine consumes less memory **

Acceptance Criteria

Scenario: 
Given empty default project
When it is opened and ready to use
Then the amount of used RSS memory shall be 10% lower than now.

Notes:

We are primarily interested in speeding up the time to process/open the project. The assumption of this issue is: if we avoid doing some work (by consuming less memory) we also speed something up. The correlation isn't 100%, but certainly by allocating less on startup we can't make the startup slower.

Comments:

Jaroslav Tulach reports a new STANDUP for yesterday (2022-04-28):

Progress: Performance investigations ~ 10% of memory saved by not allocating Truffle nodes. Can we use native-image? Dmitry's profile the language server work: #3389 - we need to eliminate the amount of dependencies - also adjust them in the upstream project as well; Review of Marcin's static drop-downs implementation. It should be finished by 2022-04-29.

Next Day: Performance investigation and improvements. (Enso Bot - Apr 29, 2022)

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**Jaroslav Tulach** reports a new **🔴 DELAY** for yesterday (2022-04-29):

Summary: There is 7 days delay in implementation of the Delay creation of Truffle nodes for function bodies (#182024911) task.
It will cause 7 days delay for the delivery of this weekly plan.

Mistakenly entered wrong end date on Thursday

Delay Cause: Wrong initial end date

Possible solutions: A week deadline is certainly more appropriate than a day (Enso Bot - Apr 30, 2022)

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**Jaroslav Tulach** reports a new **STANDUP** for yesterday (2022-04-29):

Progress: ./run --no-backend PR: #3426; ess dependencies of sampler: 3fd211c; Requires another upstream update: apache/netbeans#4052 - shall be part of NetBeans 14 in a month or so It should be finished by 2022-05-06.

Next Day: More of performance investigation and improvements. (Enso Bot - Apr 30, 2022)

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**Jaroslav Tulach** reports a new **STANDUP** for yesterday (2022-05-02):

Progress: Investigating suggestions.db format. logging "actions" next to .npss file for easy analysis: d882dc8 Talking about statics. Talking about compiler passes. Talking about performance. It should be finished by 2022-05-06.

Next Day: More detailed performance measurements. Focus on compiler passes. (Enso Bot - May 3, 2022)

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**Jaroslav Tulach** reports a new **STANDUP** for yesterday (2022-05-03):

Progress: MFF UK lecture. Display content of of .npss file: https://docs.google.com/document/d/1vRcM12m3tS1pagnCMOypaWFT6Zra7P6SnX46qSo7dLU/edit + few ideas discussed with Michael for #3389; Analyzing 7s of startup sequence: 431 ms org.enso.syntax.text.Parser - caches are in use, but one(?) file still needs to be parsed; 500ms + 545 ms org.enso.compiler.codegen.IrToTruffle (especially ExpressionProcessor); 1000 ms + 513 ms + 312 ms in org.enso.compiler.context.SuggestionBuilder - composing & sending the message to the IDE

• the rest is mostly spent in deserializing caches and resolving imports; re-measure with fix to delay creation of TruffleNodes: 1,5s faster It should be finished by 2022-05-06.

Next Day: Delaying TruffleNode creation results in few failing tests. Gonna analyze them now. (Enso Bot - May 4, 2022)

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**Jaroslav Tulach** reports a new **STANDUP** for yesterday (2022-05-04):

Progress: Polishing TruffleNodes PR: #3429; reporting SuggestionBuilder&Rope user story: https://www.pivotaltracker.com/n/projects/2539304/stories/182072427; 1:1s; Demos It should be finished by 2022-05-06.

Next Day: Delaying TruffleNode creation. (Enso Bot - May 5, 2022)

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**Jaroslav Tulach** reports a new **STANDUP** for yesterday (2022-05-05):

Progress: 1.5s out of 7s speedup: #3429; writing unit test in Java 18; Enso language debugger: #3432 It should be finished by 2022-05-06.

Next Day: Infrastructure to profile the engine language server: #3389 (Enso Bot - May 6, 2022)

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Regressions seem to be fixed: https://github.com//pull/3441 - we can mark this accepted again, I believe. (jaroslavtulach - May 11, 2022)

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