Torrent repository with parking_lot crate locks

[josecelano]

Relates to: #774

A new torrent repository implementation with a different lock implementation for the torrent entry.

The crate is: parking_lot

It's supposed to be faster than the standard implementation of Mutex and RwLock.

This PR adds two implementations with Mutex and RwLock.

Subtasks

• With parking_lot::RwLock
• With parking_lot::Mutex

Performance

With parking_lot::RwLock:

Requests out: 420183.87/second
Responses in: 356799.49/second
  - Connect responses:  176636.38
  - Announce responses: 176603.09
  - Scrape responses:   3560.02
  - Error responses:    0.00
Peers per announce response: 0.00
Announce responses per info hash:
  - p10: 1
  - p25: 1
  - p50: 1
  - p75: 1
  - p90: 2
  - p95: 3
  - p99: 104
  - p99.9: 287
  - p100: 359

With parking_lot::RwLock::Mutex

Requests out: 405157.91/second
Responses in: 363773.19/second
  - Connect responses:  180009.24
  - Announce responses: 180202.03
  - Scrape responses:   3561.92
  - Error responses:    0.00
Peers per announce response: 0.00
Announce responses per info hash:
  - p10: 1
  - p25: 1
  - p50: 1
  - p75: 1
  - p90: 2
  - p95: 3
  - p99: 105
  - p99.9: 293
  - p100: 367

With current implementation (SkipMap and Std Mutex):

Requests out: 415067.21/second
Responses in: 369397.08/second
  - Connect responses:  183049.81
  - Announce responses: 182717.15
  - Scrape responses:   3630.12
  - Error responses:    0.00
Peers per announce response: 0.00
Announce responses per info hash:
  - p10: 1
  - p25: 1
  - p50: 1
  - p75: 1
  - p90: 2
  - p95: 3
  - p99: 104
  - p99.9: 297
  - p100: 375

Conclusion

Performance looks similar (the current version is slightly better), so I would keep the current version with the standard Mutex.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.93%. Comparing base (7664ec6) to head (0058e72).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #800      +/-   ##
===========================================
+ Coverage    78.55%   78.93%   +0.37%     
===========================================
  Files          160      162       +2     
  Lines         9024     9186     +162     
===========================================
+ Hits          7089     7251     +162     
  Misses        1935     1935              

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[josecelano]

ACK 0058e72