581c9be0d8bff46cd68bd6a3bf72f22d11c09aea test: speedup wallet_backup by whitelisting peers (immediate tx relay) (Sebastian Falbesoner)
Pull request description:
approaches part of #16613 ("Functional test suite bottlenecks")
The majority of the test time is spent in `sync_mempools()` after sending to
addresses, i.e. the bottleneck is in relaying transactions. By whitelisting the
peers via `-whitelist`, the inventory is transmissioned immediately rather than
on average every 5 seconds, speeding up the test by at least a factor of two:
before:
```
$ time ./wallet_backup.py
real 2m2.523s
user 0m6.093s
sys 0m2.454s
```
with this PR:
```
$ time ./wallet_backup_with_whitelist.py
real 0m36.570s
user 0m5.365s
sys 0m1.696s
```
Note that the test is not deterministic (the `sendtoaddress` RPC in function
`one_send()` is executed with a probability of 50%), hence the times could vary
between individual runs.ACKs for top commit:
MarcoFalke: ACK 581c9be0d8bff46cd68bd6a3bf72f22d11c09aea, this test is testing the backup behaviour, not the tx relay behaviour fanquake: ACK 581c9be0d8bff46cd68bd6a3bf72f22d11c09aea
Tree-SHA512: d016f39cdb85501e17a74a4c4db5a9f7404baa76fbcc3675a34d3cd7bf03d7a4cb4fd3e5f17cb0597248120bb5ac8b15d3db7663007b76b010902be72954bde0
Backport of Core PR17121
May be related to this flakiness as well: https://build.bitcoinabc.org/viewLog.html?buildId=35712&buildTypeId=BitcoinABCMasterLinux&tab=buildLog&_focus=1865