cpuprofile and memprofile in golang testing

I tried the command go test -cpuprofile cpu.out on a GO test file and it resulted in a file cpu.out which is full of many 64 bit numbers. It doesn't make any sense to me. What did the command do and what information can get I extract from cpu.out file?

Similarly go test -memprofile mem.out generated a mem.out file which also seems to make no sense to me. Help me out.

I have attached both the files.

cpu.out and mem.out