cfmcgrady commented on PR #2086:
URL:
https://github.com/apache/incubator-celeborn/pull/2086#issuecomment-1805342745
> I found Objects.hash is even several times faster
this is because `Seq` is an implementation of `List`
```scala
// while
startTime = System.nanoTime()
var whileHash = 1
var i = 0
while (i < 5) {
whileHash = 31 * whileHash + state(i).hashCode()
i = i + 1
}
var endTime = System.nanoTime()
println(endTime - startTime)
// while 2
startTime = System.nanoTime()
whileHash = 1
i = 0
while (i < state.length) {
whileHash = 31 * whileHash + state(i).hashCode()
i = i + 1
}
endTime = System.nanoTime()
println(endTime - startTime)
startTime = System.nanoTime()
val objectHash = java.util.Objects.hash(host, rpcPort, pushPort,
fetchPort, replicatePort)
endTime = System.nanoTime()
println(endTime - startTime)
```
3924 vs 1821 vs 29459
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