feat: Make number of worker threads in relayer equal to CPU requested

[ameten]

Description

Make number of worker threads in relayer equal to CPU requested.

We request 14 CPUs for Relayer pod. This change makes the number of threads in the tokio runtime equal to the number of CPUs we request for Relayer pod so that threads do not compete for CPU resources.

Related issues

• Contributes into https://github.com/hyperlane-xyz/issues/issues/1420

Backward compatibility

Yes

Testing

Will be tested in RC

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[daniel-savu]

I think we can just remove worker_threads as it will default to the number of cores for the architecture it's run on
https://docs.rs/tokio/latest/tokio/runtime/struct.Builder.html#default

Suggested change

	#[tokio::main(flavor = "multi_thread", worker_threads = 14)]
	#[tokio::main(flavor = "multi_thread")]

[ameten]

Discussed in person.

Unfortunately, Relayer pod is not isolated in this manner. Currently, Relayer pod sees 32 CPUs while we limit to 14 CPUs. So, tokio will create 32 threads with the default setting.

from lscpu

CPU(s):                   32
  On-line CPU(s) list:    0-31

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.53%. Comparing base (ebb80f5) to head (99dd3d8).

Additional details and impacted files

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##             main    #5499   +/-   ##
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  Coverage   77.53%   77.53%           
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  Files         103      103           
  Lines        2110     2110           
  Branches      190      190           
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  Hits         1636     1636           
  Misses        453      453           
  Partials       21       21           

Components	Coverage Δ
core	87.80% <ø> (ø)
hooks	79.39% <ø> (ø)
isms	83.68% <ø> (ø)
token	91.27% <ø> (ø)
middlewares	79.80% <ø> (ø)