ledger stress test [DO NOT MERGE]

[RichardAH]

High Level Overview of Change

Context of Change

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (non-breaking change that only restructures code)
• Tests (you added tests for code that already exists, or your new feature included in this PR)
• Documentation update
• Chore (no impact to binary, e.g. .gitignore, formatting, dropping support for older tooling)
• Release

API Impact

• Public API: New feature (new methods and/or new fields)
• Public API: Breaking change (in general, breaking changes should only impact the next api_version)
• libxrpl change (any change that may affect libxrpl or dependents of libxrpl)
• Peer protocol change (must be backward compatible or bump the peer protocol version)

[RichardAH]

ripple.app.LedgerStress Multithreaded stress test: 10000 txns/ledger for 5 ledgers using 12 threads
Using 12 hardware threads
Creating 5000 accounts
Accounts created: 2500
Starting ledger 0
Metrics - Submit time: 265ms, Close time: 1406ms, Transaction count: 8486, Successful: 9985, Failed: 0, Base fee: 10
Completed ledger 0 in 1671ms with 9985 successful transactions using 12 threads
Starting ledger 1
#29986 failed: LedgerStress_test.cpp(294)
Metrics - Submit time: 242ms, Close time: 1686ms, Transaction count: 11484, Successful: 9985, Failed: 0, Base fee: 10
Completed ledger 1 in 1928ms with 9985 successful transactions using 12 threads
Starting ledger 2
Metrics - Submit time: 276ms, Close time: 1552ms, Transaction count: 9985, Successful: 9985, Failed: 0, Base fee: 10
Completed ledger 2 in 1828ms with 9985 successful transactions using 12 threads
Starting ledger 3
Metrics - Submit time: 241ms, Close time: 1554ms, Transaction count: 9985, Successful: 9985, Failed: 0, Base fee: 10
Completed ledger 3 in 1795ms with 9985 successful transactions using 12 threads
Starting ledger 4
Metrics - Submit time: 276ms, Close time: 1549ms, Transaction count: 9985, Successful: 9985, Failed: 0, Base fee: 10
Completed ledger 4 in 1825ms with 9985 successful transactions using 12 threads

[RichardAH]

After further testing threadlocalqueue did not appear to be faster, so I've changed this PR to just be a stress test. The existing code seems to be able to close 50k txn ledgers with a close time of around 8 seconds on commodity hardware.

Further optimizations should be chased in attempting to parallelize tx application, AOT and partial signature verification