ucsd cns talk, focused on networking

R=r CC=golang-dev https://golang.org/cl/186230
author: Russ Cox <rsc@golang.org> 2010-01-27 15:50:29 -0800
committer: Russ Cox <rsc@golang.org> 2010-01-27 15:50:29 -0800
commit: 9f48f7e67db568c1c2e6e4c03a19281987eb89a2 (patch)
tree: 63559c238ebd9585e1701ccb0cf97a8d4aaf4376
parent: 2ce13ba4b028d96573ff35b56d17bf6c8fe4e60a (diff)
download: go-9f48f7e67db568c1c2e6e4c03a19281987eb89a2.tar.gz
go-9f48f7e67db568c1c2e6e4c03a19281987eb89a2.zip
2 files changed, 458 insertions, 5 deletions
diff --git a/doc/talks/go_talk-20100112.html b/doc/talks/go_talk-20100112.html
index ca8e68ae3c..2e36435122 100644
--- a/doc/talks/go_talk-20100112.html
+++ b/doc/talks/go_talk-20100112.html
@@ -255,15 +255,15 @@ func main() {
 	<h2>Use explicit messages to communicate and synchronize.</h2>
 	
 <pre>
-func computeAndSend(c chan int, x, y, z int) {
-	c <- expensiveComputation(x, y, z)
+func computeAndSend(ch chan int, x, y, z int) {
+	ch <- expensiveComputation(x, y, z)
 }
 
 func main() {
-	c := make(chan int)
-	go computeAndSend(c, x, y, z)
+	ch := make(chan int)
+	go computeAndSend(ch, x, y, z)
 	v2 := anotherExpensiveComputation(a, b, c)
-	v1 := <-c
+	v1 := <-ch
 	fmt.Println(v1, v2)
 }
 </pre>
diff --git a/doc/talks/go_talk-20100121.html b/doc/talks/go_talk-20100121.html
new file mode 100644
index 0000000000..d5e4bc66f6
--- /dev/null
+++ b/doc/talks/go_talk-20100121.html
@@ -0,0 +1,453 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
+    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
+<head>
+<title>Go, Networked (January 21, 2010)</title>
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+<meta name="font-size-adjustment" content="-1" />
+<link rel="stylesheet" href="slidy.css"
+  type="text/css" media="screen, projection, print" />
+<script src="slidy.js" type="text/javascript">
+</script>
+</head>
+<body>
+<!-- this defines the slide background -->
+
+<div class="background">
+
+  <div class="header">
+  <!-- sized and colored via CSS -->
+  </div>
+
+  <div class="footer"></div>
+  </div>
+
+<div class="slide titlepage">
+<div style="height: 135px; width: 480px; overflow: hidden; position: fixed; top: auto; bottom: 10px; left: auto; right: 0;  ">
+<img src="../gordon/bumper480x270.png" style="margin: -135px 0 0 0;"/>
+</div>
+<!-- <img src="../google.png" style="position: fixed; top: auto; bottom: 30px; left: 20px; right: auto;"/> -->
+<br/>
+<img src="../go-logo-white.png">
+<br/>
+<br/>
+<h1 style="padding-right: 0pt; margin-right: 0pt; color: #0066cc; font-size: 250%; border-bottom: 0px;">The Go Programming Language</h1>
+<div style="color: #ffcc00;">
+<h2>Russ Cox</h2>
+<!-- <h3><i>rsc@google.com</i></h3> -->
+<br/>
+<h3>CNS Winter Research Review<br/><br/>January 21, 2010</h3>
+<br/>
+<br/>
+<!--
+<h4><i>click to start; then left/right arrow to change slides</i></h4> -->
+</div>
+</div>
+
+<div class="slide">
+	<h1>Go</h1>
+
+	<h2>New</h2>
+	<h2>Experimental</h2>
+	<h2>Concurrent</h2>
+	<h2>Garbage-collected</h2>
+	<h2>Systems</h2>
+	<h2>Language</h2>
+</div>
+
+<div class="slide">
+	<h1>Hello, world</h1>
+<pre>
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Printf("Hello, 世界\n")
+}
+</pre>
+</div>
+
+<div class="slide">
+	<h1>History</h1>
+	
+	<h2>Design started in late 2007.</h2>
+	<h2>Implementation starting to work mid-2008.</h2>
+	<h2>Released as an open source project in November 2009.</h2>
+	<h2>Work continues.<h2>
+	<h2>Robert&nbsp;Griesemer, Ken&nbsp;Thompson, Rob&nbsp;Pike, Ian&nbsp;Lance&nbsp;Taylor, Russ&nbsp;Cox, many others</h2>
+</div>
+
+<div class="slide">
+	<h1>Goals and Motivation</h1>
+	
+	<h2>Go fast!</h2>
+	<h2>Make programming fun again.</h2>
+	<h2>Targeted at systems software, broadly.</h2>
+</div>
+
+<div class="slide">
+	<h1>Why isn't programming fun?</h1>
+	
+	<div class="incremental">
+	<h2>Compiled, statically-typed languages (C, C++, Java) require too much typing and too much typing:</h2>
+	
+	<ul>
+		<li>verbose, lots of repetition</li>
+		<li>too much focus on type hierarchy</li>
+		<li>types get in the way as much as they help</li>
+		<li>compiles take far too long</li>
+	</ul>
+	</div>
+	
+	<div class="incremental">
+	<h2>Dynamic languages (Python, JavaScript) fix these problems (no more types, no more compiler) but introduce others:</h2>
+	
+	<ul>
+		<li>errors at run time that should be caught statically</li>
+		<li>no compilation means slow code</li>
+	</ul>
+	</div>
+	
+	<h2 class="incremental">Can we combine the best of both?</h2>
+</div>
+
+<div class="slide">
+	<h1>Why a new language?</h1>
+	
+	<div class="incremental">
+	<h2>No new systems language in 10+ years.</h2>
+	<h2>Current languages designed before ...</h2>
+	<h3>... rise of large-scale, networked and multicore computing</h3>
+	<h3>... rise of Internet-scale distributed development (many libraries)</h3>
+	</div>
+</div>
+	
+<div class="slide">
+	<h1>Go</h1>
+	
+	<h2>Make the language fast.</h2>
+	<h2>Make the tools fast.</h2>
+</div>
+
+<div class="slide">
+	<h1>Compilation Demo</h1>
+	
+	<h2>Build all standard Go packages: ~120,000 lines of code.</h2>
+</div>
+
+<div class="slide">
+	<h1>Go in one slide</h1>
+	
+	<h2 class="incremental">Lightweight syntax.</h2>
+	
+	<h2 class="incremental">Static types: enough to compile well, but inferred much of the time.</h2>
+	
+	<h2 class="incremental">Methods: on any type, orthogonal to type system.</h2>
+	
+	<h2 class="incremental">Abstract types: interface values, relations inferred statically.</h2>
+	
+	<h2 class="incremental">Visibility: inferred from case of name.</h2>
+
+	<h2 class="incremental">First-class functions.</h2>
+	
+	<h2 class="incremental">Garbage collection.</h2>
+
+	<br/>
+	
+	<h2 class="incremental">Lightweight feel of a scripting language but compiled.</h2>
+</div>
+
+<div class="slide">
+	<h1>Go, concurrently</h1>
+	
+	<h2>Cheap to create a new flow of control (goroutine):</h2>
+	
+<pre>
+func main() {
+	go expensiveComputation(x, y, z)
+	anotherExpensiveComputation(a, b, c)
+}
+</pre>
+
+	<h2>Two expensive computations in parallel.</h2>
+</div>
+
+<div class="slide">
+	<h1>Go, concurrently</h1>
+	
+	<h2>Cheap to create a new flow of control (goroutine):</h2>
+	
+<pre>
+	for {
+		rw := l.Accept()
+		conn := newConn(rw, handler)
+		go conn.serve()
+	}
+</pre>
+
+	<h2>Concurrent web server.</h2>
+	<h2>Network connections multiplexed onto epoll.</h2>
+		<ul>
+		<li>many blocked Read calls != many blocked OS threads</li>
+		</ul>
+
+</div>
+
+<div class="slide">
+	<h1>Go, synchronized</h1>
+	
+	<h2>Use explicit messages to communicate and synchronize.</h2>
+	
+<pre>
+func computeAndSend(ch chan int, x, y, z int) {
+	ch <- expensiveComputation(x, y, z)
+}
+
+func main() {
+	ch := make(chan int)
+	go computeAndSend(ch, x, y, z)
+	v2 := anotherExpensiveComputation(a, b, c)
+	v1 := <-ch
+	fmt.Println(v1, v2)
+}
+</pre>
+	<h2>Notice communication of result in addition to synchronization.</h2>
+</div>
+
+<div class="slide">
+	<h1>Go, synchronized</h1>
+	
+	<h2>RPC client</h2>
+
+<pre>
+func (client *Client) Call(method string, args, reply interface{}) os.Error {
+    // Send RPC message.
+    call := client.Go(method, args, reply, nil)
+	
+    // Read reply from Done channel.
+    <-call.Done
+
+    return call.Error
+}
+</pre>	
+</div>
+
+<div class="slide">
+	<h1>Go, synchronized</h1>
+	
+	<h2>RPC client demux</h2>
+
+<pre>
+func (client *Client) input() {
+	for {
+		resp := client.readResponse()
+		client.mutex.Lock()
+		c := client.pending[resp.Seq]
+		client.pending[resp.Seq] = c, false
+		client.mutex.Unlock()
+		if resp.Error != "" {
+			c.Error = os.ErrorString(resp.error)
+		}
+		resp.Decode(c.Reply)
+		c.Done <- c
+	}
+}
+</pre>
+</div>
+
+<div class="slide">
+	<h1>Go, synchronized</h1>
+	
+	<h2>RPC client demux</h2>
+
+<pre>
+func (client *Client) input() {
+	for {
+		<font style="color: black;">resp := client.readResponse()</font>
+		client.mutex.Lock()
+		c := client.pending[resp.Seq]
+		client.pending[resp.Seq] = c, false
+		client.mutex.Unlock()
+		if resp.Error != "" {
+			c.Error = os.ErrorString(resp.error)
+		}
+		resp.Decode(c.Reply)
+		c.Done <- c
+	}
+}
+</pre>
+<h2>Read response from network.</h2
+</div>
+
+<div class="slide">
+	<h1>Go, synchronized</h1>
+	
+	<h2>RPC client demux</h2>
+
+<pre>
+func (client *Client) input() {
+	for {
+		resp := client.readResponse()
+		<font style="color: black;">client.mutex.Lock()
+		c := client.pending[resp.Seq]
+		client.pending[resp.Seq] = c, false
+		client.mutex.Unlock()</font>
+		if resp.Error != "" {
+			c.Error = os.ErrorString(resp.error)
+		}
+		resp.Decode(c.Reply)
+		c.Done <- c
+	}
+}
+</pre>
+<h2>Look up request by sequence number.</h2
+</div>
+
+<div class="slide">
+	<h1>Go, synchronized</h1>
+	
+	<h2>RPC client demux</h2>
+
+<pre>
+func (client *Client) input() {
+	for {
+		resp := client.readResponse()
+		client.mutex.Lock()
+		c := client.pending[resp.Seq]
+		client.pending[resp.Seq] = c, false
+		client.mutex.Unlock()
+		<font style="color: black;">if resp.Error != "" {
+			c.Error = os.ErrorString(resp.error)
+		}
+		resp.Decode(c.Reply)</font>
+		c.Done <- c
+	}
+}
+</pre>
+<h2>Decode response fields from payload.</h2
+</div>
+
+<div class="slide">
+	<h1>Go, synchronized</h1>
+	
+	<h2>RPC client demux</h2>
+
+<pre>
+func (client *Client) input() {
+	for {
+		resp := client.readResponse()
+		client.mutex.Lock()
+		c := client.pending[resp.Seq]
+		client.pending[resp.Seq] = c, false
+		client.mutex.Unlock()
+		if resp.Error != "" {
+			c.Error = os.ErrorString(resp.error)
+		}
+		resp.Decode(c.Reply)
+		<font style="color: black;">c.Done <- c</font>
+	}
+}
+</pre>
+<h2>Tell client that it finished.</h2
+</div>
+
+<div class="slide">
+	<h1>Go, synchronized</h1>
+	
+	<h2>RPC client demux</h2>
+
+<pre>
+func (client *Client) input() {
+	for {
+		resp := client.readResponse()
+		client.mutex.Lock()
+		c := client.pending[resp.Seq]
+		client.pending[resp.Seq] = c, false
+		client.mutex.Unlock()
+		if resp.Error != "" {
+			c.Error = os.ErrorString(resp.error)
+		}
+		resp.Decode(c.Reply)
+		c.Done <- c
+	}
+}
+</pre>
+
+<h2>Can create multiple Calls with same Done channel
+and distinguish which finished by inspecting value sent on channel.
+</h2>
+
+</div>
+
+<div class="slide">
+	<h1>Goroutine demo</h1>
+	
+	<h2>Chain together 100,000 goroutines connected by 100,001 channels.</h2>
+	
+	<h2>Send a value to one end of the chain.</h2>
+	
+	<h2>Each passes it along, increments.</h2>
+	
+	<h2>Receive value out the other end of the chain.</h2>
+</div>
+	
+
+<div class="slide">
+	<h1>Go Status</h1>
+</div>
+
+<div class="slide">
+	<h1>Go Status</h1>
+	
+	<h2>Open source:</h2>
+	<ul>
+	<li>released on November 10, 2009
+	<li>regular releases (~ weekly)
+	<li>all development done in public Mercurial repository
+	<li>outside contributions welcome
+	<li>two independent compiler implementations
+	<li>XML, JSON, HTTP, TLS/SSL, native RPC, (network channels,) ...
+	</ul>
+</div>
+
+<div class="slide">
+	<h1>Go Status</h1>
+	
+	<h2>Open source</h2>
+
+	<h2>Portable:</h2>
+	<ul>
+	<li>FreeBSD, Linux, OS X (x86, x86-64)
+	<li>(in progress) Linux arm, Native Client x86, Windows x86.
+	</ul>
+</div>
+
+<div class="slide">
+	<h1>Go Status</h1>
+	
+	<h2>Open source</h2>
+	<h2>Portable</h2>
+
+	<h2>Still in progress, experimental.  Yet to come:</h2>
+	<ul>
+	<li>production garbage collector
+	<li>generics?
+	<li>exceptions?
+	<li>unions or sum types?
+	</ul>
+</div>
+
+<div class="slide titlepage">
+	<h1>Questions?</h1>
+	<br><br>
+	<center>
+	<img src="../gordon/bumper640x360.png">
+	</center>
+	<br><br>
+	<div style="color: #ffcc00;">
+	<!-- <h3><i>rsc@google.com</i></h3> -->
+	</div>
+</div>
+
+</body></html>
author	Russ Cox <rsc@golang.org>	2010-01-27 15:50:29 -0800
committer	Russ Cox <rsc@golang.org>	2010-01-27 15:50:29 -0800
commit	9f48f7e67db568c1c2e6e4c03a19281987eb89a2 (patch)
tree	63559c238ebd9585e1701ccb0cf97a8d4aaf4376
parent	2ce13ba4b028d96573ff35b56d17bf6c8fe4e60a (diff)
download	go-9f48f7e67db568c1c2e6e4c03a19281987eb89a2.tar.gz go-9f48f7e67db568c1c2e6e4c03a19281987eb89a2.zip