bbufer -- an alternative of standard library bytes.Buffer.
bytes.Buffer frequently allots space and copies slice when the buffer size grows.
However bbufer just stores the data from method Writes() into slice of byte slice ([][]byte), and only copies once when we need all the data by calling
method Bytes(), which could reduce memory allocation.
If writing a large number of times, it will bring high load to GC. system will cost a lot of time scanning objects.
This package is "go-gettable", just:
go get -u github.com/shenwei356/bbuffer
Just like bytes.Buffer
import "github.com/shenwei356/bbuffer"
var b bbufer.Buffer // or b := bbufer.NewBuffer()
b.Write(data) // write []byte to it
b.Bytes() // return the data
b.Reset() // reset
Time
$ go test -bench=. -memprofile mem.out -cpuprofile cpu.out
generate test data for test. scale 1/3: 1000
generate test data for test. scale 2/3: 1000000
generate test data for test. scale 3/3: 100000000
PASS
BenchmarkBBufer-4 2000000000 0.08 ns/op
BenchmarkBytesBufer-4 2000000000 0.16 ns/op
CPU profile
$ go tool pprof ./bbuffer.test cpu.out
Allocated memory
$ go tool pprof --alloc_space ./bbuffer.test mem.out
Copyright (c) 2016, Wei Shen (shenwei356@gmail.com)