Expose RPC request concurrency as a flag

[radeksimko]

Current Version

0.16.1

Use-cases

Generally the language server should work well within the resource constraints of the machine that it is running on. i.e. it shouldn't use excessive amount of CPU.

The most common way of achieving this in Go is to cap number of concurrent operations to the number of available CPUs, i.e. runtime.NumCPU().

This should provide balance (between speed and CPU usage) for most users, but in some cases the user may wish to trade speed for CPU or vice versa - for example when they're actually more constrained and multiple other processes are competing for the same CPUs.

Proposal

Introduce -req-concurrency flag to terraform-ls serve which will control the concurrency of the underlying jrpc2 library. That way users have an escape hatch they can utilize in described (hopefully rare) cases.

[github-actions]

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