Add benchmark for different data sizes

[gkowal]

This benchmark tests the speed of the chunker for different data sizes. The assumed average chunk size is 1MiB.

Example output is

BenchmarkFastCDCSize/1k                      818           1416360 ns/op           0.72 MB/s             1.00 chunks     8388720 B/op          2 allocs/op
BenchmarkFastCDCSize/4k                      830           1414823 ns/op           2.90 MB/s             1.00 chunks     8388720 B/op          2 allocs/op
BenchmarkFastCDCSize/16k                     829           1426192 ns/op          11.49 MB/s             1.00 chunks     8388720 B/op          2 allocs/op
BenchmarkFastCDCSize/32k                     813           1422427 ns/op          23.04 MB/s             1.00 chunks     8388720 B/op          2 allocs/op
BenchmarkFastCDCSize/64k                     835           1423337 ns/op          46.04 MB/s             1.00 chunks     8388720 B/op          2 allocs/op
BenchmarkFastCDCSize/128k                    825           1431522 ns/op          91.56 MB/s             1.00 chunks     8388720 B/op          2 allocs/op
BenchmarkFastCDCSize/256k                    805           1475553 ns/op         177.66 MB/s             1.00 chunks     8388720 B/op          2 allocs/op
BenchmarkFastCDCSize/512k                    609           1993781 ns/op         262.96 MB/s             1.00 chunks     8388720 B/op          2 allocs/op
BenchmarkFastCDCSize/1M                      424           2836833 ns/op         369.63 MB/s             1.00 chunks     8388720 B/op          2 allocs/op
BenchmarkFastCDCSize/4M                      146           8297601 ns/op         505.48 MB/s             4.00 chunks     8388720 B/op          2 allocs/op
BenchmarkFastCDCSize/16M                      43          27008988 ns/op         621.17 MB/s            15.0 chunks      8388720 B/op          2 allocs/op
BenchmarkFastCDCSize/32M                      21          53433832 ns/op         627.96 MB/s            28.0 chunks      8388720 B/op          2 allocs/op
BenchmarkFastCDCSize/64M                      10         107862732 ns/op         622.17 MB/s            56.0 chunks      8388720 B/op          2 allocs/op
BenchmarkFastCDCSize/128M                      5         209478770 ns/op         640.72 MB/s           116 chunks        8388720 B/op          2 allocs/op
BenchmarkFastCDCSize/512M                      2         846476085 ns/op         634.24 MB/s           454 chunks        8388720 B/op          2 allocs/op
BenchmarkFastCDCSize/1G                        1        1679996392 ns/op         639.13 MB/s           902 chunks        8388720 B/op          2 allocs/op

Signed-off-by: Grzegorz Kowal [email protected]

[codecov-commenter]

Codecov Report

Merging #1 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #1   +/-   ##
=======================================
  Coverage   95.83%   95.83%           
=======================================
  Files           1        1           
  Lines          96       96           
=======================================
  Hits           92       92           
  Misses          2        2           
  Partials        2        2           

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