Notes Performance comparison of the string assembling mode of Go language

This is a creation in Article, where the information may have evolved or changed.

There are many ways to assemble strings in the go language, so the question is, which is the best performance?

The following code, respectively, compares the FMT. Sprintf,string +,strings. Join,bytes. Buffer, the method is to loop several times the total time of comparison.

The results of the operation under the Ubuntu 14.04 under VMware Show:

• Fmt. Sprintf and strings. Join speed is quite
• String + one times faster than the above
• bytes. And the buffer is about 400-500 times faster than the last person.
• If a bytes is temporarily declared within a loop. Buffer to use, will be 50% slower than persistent, but still very fast

The test code is as follows:

Package Mainimport ("bytes"    "FMT"    "Strings"    " Time") func benchmarkstringfunction (nint, indexint) (d time. Duration) {V:="ni shuo wo shi bu shi tai wu liao le a?"    varSstring    varbuf bytes. Buffer T0:=Time . Now () forI: =0; I < n; i++ {        SwitchIndex { Case 0://FMT. Sprintfs = fmt. Sprintf ("%s[%s]", S, v) Case 1://string +s = s +"["+ V +"]"         Case 2://strings. Joins = strings. Join ([]string{s,"["V"]"},"")         Case 3://Temporary bytes. BufferB: =bytes. buffer{} b.writestring ("[") b.writestring (v) b.writestring ("]") s=b.string () Case 4://Stable bytes. BufferBuf. WriteString ("[") buf. WriteString (v) buf. WriteString ("]")        }        ifi = = N1 {            ifindex = =4{//For stable bytes. Buffers =buf. String ()} FMT. Println (Len (s))//consume s to avoid compiler optimization}} T1:=Time . Now () d=t1. Sub (t0) fmt. Printf ("Time of the (%d) =%v\n", index, D)returnD}func Main () {k:=5D:= [5]time. duration{} forI: =0; I < K; i++{D[i]= Benchmarkstringfunction (10000, I)}  forI: =0; I < K1; i++{fmt. Printf ("The on-the-%6.1f times of the- %d\n", I, float32 (D[i])/float32 (d[k-1]), K-1)    }}

One of the results was as follows:

etworker@ubuntu:~/work/go/test$ Go run testbenchmark.go410000Time of the -0)=1. 199641573s410000Time of the -1)=568. 716669ms410000Time of the -2)=1. 197077483s ATime of the -3)=2. 277063ms410000Time of the -4)=1. 398864msway0  is  857.6Times of the4 the1  is  406.6Times of the4 the2  is  855.7Times of the4 the3  is    1.6Times of the4