Github user caneGuy commented on the issue:
https://github.com/apache/spark/pull/18730
Update with
[Benchmark](https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/util/Benchmark.scala)
@kiszk
```
Running benchmark: Benchmark writeWithSlice() and writeFully()
Running case: Test writeFully() chunks each with 30m for 10 loop
Stopped after 10 iterations, 2365 ms
Running case: Test writeWithSlice() chunks each with 30m for 10 loop
Stopped after 10 iterations, 1440 ms
Running case: Test writeFully() chunks each with 100m for 50 loop
Stopped after 50 iterations, 2860 ms
Running case: Test writeWithSlice() chunks each with 100m for 50 loop
Stopped after 50 iterations, 2834 ms
Java HotSpot(TM) 64-Bit Server VM 1.8.0_25-b17 on Linux 4.4.0-64-generic
Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz
Benchmark writeWithSlice() and writeFully(): Best/Avg Time(ms) Rate(M/s)
Per Row(ns) Relative
------------------------------------------------------------------------------------------------
Test writeFully() chunks each with 30m for 10 loop 98 / 237
160.8 6.2 1.0X
Test writeWithSlice() chunks each with 30m for 10 loop 55 / 144
287.6 3.5 1.8X
Test writeFully() chunks each with 100m for 50 loop 54 / 57
290.3 3.4 1.8X
Test writeWithSlice() chunks each with 100m for 50 loop 54 / 57
288.9 3.5 1.8X
```
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