go build ./...

go test ./...

cd cmd/largesort
./test.sh

• using 32 bit binary for intermediate files
• using unsafe casts to read and write files directly into []int64 without going through binary.LittleEndian
• run merges in parralel
• initially we waited for the initial leafSort pass to complete before starting merging the chunks. We now start merging as soon as the first two chunks have been written.
• use int32 rather than int64, halving the amnount of disk io.

This speeds up sort time by a factor of 3.

generating 10000000 random numbers
running largesort
real	0m17.807s
user	0m14.183s
sys	0m2.845s

generating 10000000 random numbers
running largesort
real	0m4.840s
user	0m4.469s
sys	0m0.675s

We should probably limit the number of active goroutines to the number of cores on the machine.