The State of Go - Andrew Gerrand
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Transcript of The State of Go - Andrew Gerrand
The State of GoWhere we are in June 2014
Andrew Gerrand
Yesterday
Initial reception
Looking back on the first months.
Complaints
The complaints started right away…
Familiar complaints
Familiar complaints
The first HN thread about Go was mostly an argument about braces and indentation.
Historic moments
The first public language change (Dec 10, 2009):
The gopher
The gopher
The gopher
A keen observation
Signs of hope
Today
Growth
User groups
Today there are 48 active user groups in 15 countries across 5 continents.
GopherCon
Community-driven. 3 days. 700 attendees. 24 talks. 1 panel. 4 hours of lightning talks!
The gopher
The gopher
The gopher
Go 1.3
Released last Wednesday, 18 June 2014.
Highlights:
Native Client support (amd64, 386)
DragonFly BSD, Plan 9, and Solaris support
Improved performance (GC, contiguous stacks, race detector, regexp)
Faster incremental builds (linker overhaul)
Precise GC of stacks
Static analysis in godoc
Tomorrow
Upcoming conferences
Go 1.4
Due December 1st, 2014.
What might be in it? (Speculative list follows.)
New language features
Nope.
Canonical import paths
A means for a repository to specify its canonical import path.
Goal: stop people from checking out repos from the wrong path.
Applications:
Stable vanity import paths.
"camlistore.org" -> "camlistore.googlesource.com/camlistore"
Make GitHub's fork model less painful.
(Proposal forthcoming.)
Internal packages
Current proposal:
"An import of a path containing the element “internal” is disallowed if the importingcode is outside the tree rooted at the parent of the “internal” directory."
Code in /a/b/c/internal/d/e/f can be imported only by code in the directorytree rooted at /a/b/c.
$GOROOT/src/pkg/internal/xxx can be imported only by other code in thestandard library ($GOROOT/src/).
And, later:
$GOPATH/src/mypkg/internal/foo can be imported only by code in$GOPATH/src/mypkg.
golang.org/s/go14internal (http://golang.org/s/go14internal)
src/pkg → src
Move the standard library from $GOROOT/src/pkg to $GOROOT/src.
Basically makes $GOROOT work just like $GOPATH.
(Not a big deal for most, but a nice clean up for the core.)
golang.org/s/go14nopkg (http://golang.org/s/go14nopkg)
File system access throttling
Throttling of access to the file system at the os package level.
Goal:
Launch a million goroutines that do file system stuff.
Don't launch a million operating system threads to block on the syscalls.
Make it work just as nicely as it does with the network.
(Proposal forthcoming.)
"go generate"
A convenience for generating Go source code. Example uses:
yacc: generating .go files from yacc grammar (.y) files
protobufs: generating .pb.go files from protocol buffer definition (.proto) files
HTML: embedding .html files into Go source code
Other ideas abound…
Proposed mechanism:
Add generator directive in Go source files:
//go:generate yacc -o gopher.go gopher.y
Use the Go tool to execute the directives:
% go generate [packagepath]
(Proposal forthcoming.)
More tool chain work
cmd/go support for gccgo
cmd/go support for embedded data files
Race detector improvements
The transition from C to Go continues:
Linker rewritten in Go (cmd/link)
Assembler rewritten in Go (cmd/asm)
Possibly: cmd/gc translated to Go
Better GC and malloc
The existing allocator is based on TCMalloc (designed for C/C++). It can be re-designed to better suit Go.
Lighter representation and colocation of GC metadata.
Various strategies for reducing GC pause time (concurrent sweep, etc).
Rough estimate: 10-20% overall speedup, 20-50% GC pause reduction, 5-10% RSSreduction.
Details:
golang.org/s/go14mallocgc (http://golang.org/s/go14mallocgc)
Other runtime changes
Concurrency improvements:
Lock-free fast path for non-blocking receive from empty channel.
Rewrite select to hold only one channel lock at a time.
C to Go:
G-stack runtime converted to Go.
Package changes
Easier structuring features in text/template
Bring reflect.Value back to 3 words
Fix embedded field visibility (reflect)
Safe version of encoding/gob
Unicode 7 support
Ports
Native Client arm
PowerPC 64
ARM64
Go support for Android
Go support for the NDK. (Like C/C++ today, but better!)
Goal: enough support for writing games.
Based on the work of Elias Naur and others in the community.
golang.org/s/go14android (http://golang.org/s/go14android)
Questions?
Thank you
Andrew Gerrand