Github user Lewuathe commented on the pull request:
https://github.com/apache/spark/pull/3900#issuecomment-69015470
I have done simple investigation between nio channel map and `ByteBuffer`
copy
with this
[JavaNIOTest](https://gist.github.com/Lewuathe/33a3e582cdd268169d40).
```
# 650B
650B file time taken with byte buffer: 2969000 ns
650B file time taken with channel map: 878000 ns
# 6.5KB
6500B file time taken with byte buffer: 3026000 ns
6500B file time taken with channel map: 808000 ns
65000B file time taken with byte buffer: 3048000 ns
65000B file time taken with channel map: 861000 ns
650000B file time taken with byte buffer: 3198000 ns
650000B file time taken with channel map: 818000 ns
6500000B file time taken with byte buffer: 4610000 ns
6500000B file time taken with channel map: 884000 ns
```
This test has been done my Mac Pro. Page size is configured as 4096.
```
% getconf PAGESIZE
(master)
4096
```
Of course this is the only simple test,
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