gistfile1.txt

$ go test -cpu 1,4 -bench Pipe -benchmem .
PASS
BenchmarkPipeline  	      50	  25605141 ns/op	  45.76 MB/s	 3263675 B/op	   32618 allocs/op
BenchmarkPipeline-4	    2000	   1311399 ns/op	  30.85 MB/s	  163586 B/op	    1582 allocs/op

$ git checkout remove_front_buff
Switched to branch 'remove_front_buff'
$ go test -cpu 1,4 -bench Pipe -benchmem .
PASS
BenchmarkPipeline  	     100	  13675065 ns/op	 110.69 MB/s	 3564797 B/op	   36274 allocs/op
BenchmarkPipeline-4	    2000	    501283 ns/op	  57.37 MB/s	   96341 B/op	     952 allocs/op
ok  	github.com/heroku/log-shuttle	5.028s