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Merge bitcoin/bitcoin#29608: optimization: Preallocate addresses in GetAddr based on nNodes

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66082ca3488e7ad78149e05631dccd09be03c961 Preallocate addresses in GetAddr based on nNodes (Lőrinc)

Pull request description:

  The reserve method optimizes memory allocation by preallocating space for the expected number of elements (nNodes), reducing reallocations and improving performance. The upper bound ensures efficient memory usage based on the input constraints.

  before:
  ```
  |               ns/op |                op/s |    err% |     total | benchmark
  |--------------------:|--------------------:|--------:|----------:|:----------
  |           76,852.79 |           13,011.89 |    0.4% |      1.07 | `AddrManGetAddr`
  |           76,598.21 |           13,055.14 |    0.2% |      1.07 | `AddrManGetAddr`
  |           76,296.32 |           13,106.79 |    0.1% |      1.07 | `AddrManGetAddr`
  ```

  after:
  ```
  |               ns/op |                op/s |    err% |     total | benchmark
  |--------------------:|--------------------:|--------:|----------:|:----------
  |           65,966.97 |           15,159.10 |    0.3% |      1.07 | `AddrManGetAddr`
  |           66,075.40 |           15,134.23 |    0.2% |      1.06 | `AddrManGetAddr`
  |           66,306.34 |           15,081.51 |    0.3% |      1.06 | `AddrManGetAddr`
  ```

ACKs for top commit:
  stickies-v:
    ACK 66082ca3488e7ad78149e05631dccd09be03c961
  vasild:
    ACK 66082ca3488e7ad78149e05631dccd09be03c961

Tree-SHA512: 1175cff250d9c52ed042e8807ddc2afd64a806e6f2195b5c648752869ff3beec0be8a8cbd7ab6ba35cd7077d79b88a380da6c6e244f5549f98cdd472808b6d8f
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merge-script 2024-10-25 14:45:42 +01:00
commit d4abaf8c9d
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src/addrman.cpp
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@ -824,6 +824,7 @@ std::vector<CAddress> AddrManImpl::GetAddr_(size_t max_addresses, size_t max_pct
// gather a list of random nodes, skipping those of low quality
const auto now{Now<NodeSeconds>()};
std::vector<CAddress> addresses;
addresses.reserve(nNodes);
for (unsigned int n = 0; n < vRandom.size(); n++) {
if (addresses.size() >= nNodes)
break;