如何在压缩之前和之后测量字节大小和时间

Question

I want to gzip a string (it is actually a JSON response)

var b bytes.Buffer
gz := gzip.NewWriter(&b)
if _, err := gz.Write([]byte("YourDataHere")); err != nil {
    panic(err)
}

How can I easily output the size of bytes before and after compression and more importantly how can I time it takes to compress and decompress back to a string?

Answer 1

You can calculate the size as per Nipun Talukdar's comment.

len([]byte("YourDataHere")) b.Len()

And use time.Now() and time.Since() to get the time taken.

var b bytes.Buffer
input := []byte("YourDataHere")

fmt.Println("Input size : ", len(input))

gz := gzip.NewWriter(&b)


start := time.Now() 

gz.Write(input)
if _, err := gz.Flush(); err != nil {
        panic(err)
}


totalTime := time.Since(start) 

fmt.Println("Compressed size : ", b.Len(), "
Time taken : ", totalTime)
gz.Close()

Same method can be applied with unzipping. You can also create a support function that can do the timing.

func timer(startTime time.Time) {

totalTime := time.Since(startTime)
log.Println("Time taken : ",totalTime)

}

Usage : defer timer(time.Now()) at the start of the function.