Mastering Go - Second Edition

Comparing the performance of the presented techniques

As all four programs are using huge data structures, they are consuming large amounts of memory. Programs that consume lots of memory space trigger the Go garbage collector more often. So, in this subsection, we are going to compare the performance of each one of these four implementations using the time(1) command.

What will be important in the presented output is not the exact numbers but the time difference between the four different approaches. Here we go:

$ time go run sliceGC.go
    
real  1.50s
user  1.72s
sys   0.71s
$ time go run mapStar.go
    
real  13.62s
user  23.74s
sys   1.89s
$ time go run mapNoStar.go
    
real  11.41s
user  10.35s
sys   1.15s
$ time go run mapSplit.go
    
real  10.60s
user  10.01s