go1.8.slide

Go 1.8 Features
16 Feb 2016

Dinesh Kumar
https://github.com/devdinu

Rajeev BharShetty
https://github.com/rShetty

* GOPATH

- $HOME/go Unix,MAC 
- %USERPROFILE%\go Windows

    go env GOPATH

* GC Pause

*** Gopher

.code src/trace1.part

* GC Pause
*** 2 GoRoutines
.code src/trace2.part

* STW why?

- Tricolor GC (Black, Grey, White)
- Write Barriers
- STW (To Ensure that No White Nodes is referred)
- Free nodes which are White

.link https://blog.pusher.com/golangs-real-time-gc-in-theory-and-practice/ Tricolor Gc

* Verify

- Trace Tool

    go install
    GODEBUG=gctrace=1 GOGC=10 $GOBIN/trace
    go tool trace -http=':1234' dumps/go1.8.trace

* HTTP ShutDown

- Listen on Signal (Interrupt) to gracefully shutdown server
  
    server.Shutdown(context.Background())

.code src/graceful/graceful_shutdown.go /START OMIT/,/END OMIT/

* Slice Sort

.code src/slicesort/sort_gophers.go

* Encoding/base64

- Encoding.Strict returns error when trailing padding are not zero

   data, err := base64.StdEncoding.Strict().DecodeString("WvLTlMrX9NpYDQlEIFlnDB==")


* Digging deeper to Encoding/base64

- Guess
    "WvLTlMrX9NpYDQlEIFlnDB==" same as "WvLTlMrX9NpYDQlEIFlnDA==" ???

.play -edit ./src/encoding/encoding.go /START OMIT/,/END OMIT/

* References
.link https://beta.golang.org/doc/go1.8 go1.8 doc
.link https://tools.ietf.org/html/rfc4648#section-3.5 rfc46468 Canonical Encoding
.link https://github.com/golang/go/issues/16721#issuecomment-241085266 Making Sort Easier
.link https://blog.golang.org/go15gc go15gc
.link https://github.com/golang/proposal/blob/master/design/17503-eliminate-rescan.md Eliminate Rescan Proposal

* Questions

.image images/gopher_party1.8.png _ 500

* License

.image ./images/by-sa.png