andygrove commented on issue #2904:
URL:
https://github.com/apache/datafusion-comet/issues/2904#issuecomment-3726259278
performance degrades as partitions increase
```
OpenJDK 64-Bit Server VM 17.0.17+10-Ubuntu-122.04 on Linux 6.8.0-90-generic
AMD Ryzen 9 7950X3D 16-Core Processor
Shuffle with nested schema (maxDepth=2, partitionNum=5): Best Time(ms)
Avg Time(ms) Stdev(ms) Rate(M/s) Per Row(ns) Relative
---------------------------------------------------------------------------------------------------------------------------------------
Spark 72
103 36 0.0 72458.8 1.0X
Comet (Spark Shuffle) 64
69 4 0.0 63977.1 1.1X
Comet (jvm Shuffle) 86
91 5 0.0 86170.0 0.8X
Comet (native Shuffle) 60
65 6 0.0 60448.2 1.2X
OpenJDK 64-Bit Server VM 17.0.17+10-Ubuntu-122.04 on Linux 6.8.0-90-generic
AMD Ryzen 9 7950X3D 16-Core Processor
Shuffle with nested schema (maxDepth=2, partitionNum=201): Best Time(ms)
Avg Time(ms) Stdev(ms) Rate(M/s) Per Row(ns) Relative
-----------------------------------------------------------------------------------------------------------------------------------------
Spark 87
95 6 0.0 86502.3 1.0X
Comet (Spark Shuffle) 85
89 3 0.0 84949.9 1.0X
Comet (jvm Shuffle) 875
890 22 0.0 874661.3 0.1X
Comet (native Shuffle) 85
92 12 0.0 84685.0 1.0X
```
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