GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/bill/Library/Caches/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/bill/code/go"
GOPROXY=""
GORACE=""
GOROOT="/usr/local/go"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/p6/l5y36lvx3zvdc3gtfh0g_43w0000gn/T/go-build393058492=/tmp/go-build -gno-record-gcc-switches -fno-common"

$ go test -gcflags "-m -m" -run none -bench . -benchtime 3s -benchmem -memprofile p.out  
$ go tool pprof p.out  
(pprof) weblist algOne  

Type: alloc_space
Time: Sep 3, 2018 at 10:39am (PDT)
Total: 325.53MB
github.com/ardanlabs/gotraining/topics/go/profiling/memcpu.algOne
/Users/bill/code/go/src/github.com/ardanlabs/gotraining/topics/go/profiling/memcpu/stream.go

  Total:    325.53MB   325.53MB (flat, cum)   100%
     78            .          .            
     79            .          .           // algOne is one way to solve the problem. 
     80            .          .           func algOne(data []byte, find []byte, repl []byte, output *bytes.Buffer) { 
     81            .          .            
     82            .          .           	// Use a bytes Buffer to provide a stream to process. 
     83     311.03MB   311.03MB           	input := bytes.NewBuffer(data) 
     84            .          .            
     85            .          .           	// The number of bytes we are looking for. 
     86            .          .           	size := len(find) 
     87            .          .            
     88            .          .           	// Declare the buffers we need to process the stream. 
     89      14.50MB    14.50MB           	buf := make([]byte, size) 
     90            .          .           	end := size - 1 
     91            .          .            
     92            .          .           	// Read in an initial number of bytes we need to get started. 
     93            .          .           	if n, err := io.ReadFull(input, buf[:end]); err != nil { 
     94            .          .           		output.Write(buf[:n]) 

ROUTINE ======================== github.com/ardanlabs/gotraining/topics/go/profiling/memcpu.algOne in /Users/bill/code/go/src/github.com/ardanlabs/gotraining/topics/go/profiling/memcpu/stream.go
   14.50MB   325.53MB (flat, cum)   100% of Total
         .          .     78:
         .          .     79:// algOne is one way to solve the problem.
         .          .     80:func algOne(data []byte, find []byte, repl []byte, output *bytes.Buffer) {
         .          .     81:
         .          .     82:	// Use a bytes Buffer to provide a stream to process.
         .   311.03MB     83:	input := bytes.NewBuffer(data)
         .          .     84:
         .          .     85:	// The number of bytes we are looking for.
         .          .     86:	size := len(find)
         .          .     87:
         .          .     88:	// Declare the buffers we need to process the stream.
   14.50MB    14.50MB     89:	buf := make([]byte, size)
         .          .     90:	end := size - 1