avantgardnerio commented on PR #2204:
URL:
https://github.com/apache/datafusion-ballista/pull/2204#issuecomment-5209167496
@andygrove @phillipleblanc we now have our first real (EKS) benchmark
results for halo-based parallel windows. h2o is kind of a worst case, because
as the data keeps getting bigger, the value range stays the same, so the cost
of duplicated halos starts to dominate:
```
┌─────┬─────────────┬──────────────────────────┬─────────────────────────────────────┐
│ K │ Theoretical │ With #2204 range-pruning │ Without (today)
│
├─────┼─────────────┼──────────────────────────┼─────────────────────────────────────┤
│ 8 │ 6.5× │ 6.5× │ ~4.7× observed
│
├─────┼─────────────┼──────────────────────────┼─────────────────────────────────────┤
│ 16 │ 10.8× │ ~10× │ probably ~6× (I/O amp
bites harder) │
├─────┼─────────────┼──────────────────────────┼─────────────────────────────────────┤
│ 32 │ 16.3× │ ~14× │ probably ~7× (I/O amp
dominates) │
├─────┼─────────────┼──────────────────────────┼─────────────────────────────────────┤
│ 100 │ ~25× │ ~20× │ collapses (300% halo)
│
└─────┴─────────────┴──────────────────────────┴─────────────────────────────────────┘
```
but even if we cap it at 8 or 32 cores, 5-15x wins seem worthwhile? (not to
mention OOM reduction). I promised "this time" I was just going to deliver a PR
with e2e abilities, but TBH it's grown too big again. Given that it now proves
it works, you guys cool with me splitting off lots of little supporting PRs
from this?
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