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doc/go1.3.html: Performance, plus some library details
LGTM=dvyukov, iant, rsc R=golang-codereviews, dvyukov, iant, rsc CC=golang-codereviews https://golang.org/cl/85250043
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doc/go1.3.html
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doc/go1.3.html
@ -92,6 +92,8 @@ liveness (TODO what to say)
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<p>
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TODO compiler/linker boundary moved
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TODO: liblink: pull linker i/o into separate liblink C library (CL 35790044)
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</p>
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<p>
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@ -124,36 +126,68 @@ cmd/go: cover -atomic for -race (CL 76370043)
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<h2 id="performance">Performance</h2>
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<p>
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TODO
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The performance of Go binaries for this release has improved in many cases due to changes
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in the runtime and garbage collection, plus some changes to libraries.
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Significant instances include:
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</p>
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<ul>
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<li>
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TODO
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As mentioned above, the default stack size has been reduced from 8 kilobytes to 4 kilobytes.
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</li>
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<li>
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The runtime handles defers more efficiently, reducing the memory footprint by about two kilobytes
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per goroutine that calls defer.
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</li>
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<li>
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The garbage collector has been sped up, using a concurrent sweep algorithm,
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better parallelization, and larger pages.
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The cumulative effect can be a 50-70% reduction in collector pause time.
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</li>
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<li>
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The race detector (see <a href="http://golang.org/doc/articles/race_detector.html">this guide</a>)
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is now about 40% faster.
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</li>
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<li>
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The regular expression package <a href="/pkg/regexp/"><code>regexp</code></a>
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is now significantly faster for certain simple expressions due to the implemenation of
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a second, one-pass execution engine. The choice of which engine to use is automatic;
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the details are hidden from the user.
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</li>
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</ul>
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<p>
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Also, the runtime now includes in stack dumps how long a goroutine has been blocked,
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which can be useful information when debugging deadlocks or performance issues.
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</p>
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<h2 id="library">Changes to the standard library</h2>
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<p>
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TODO: Which should be called out?
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</p>
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<p>
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There is an important new type added to the standard library: <a href="/pkg/sync/pool/"><code>sync/pool</code></a>.
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TODO: sync: add Pool (CL 41860043, 46010043)
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</p>
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<h3 id="new_packages">New packages</h3>
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<p>
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No new packages appear in the core libraries in Go 1.3.
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</p>
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<h3 id="major_library_changes">Major changes to the library</h3>
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<p>
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There is an important new type added to the standard library: <a href="/pkg/sync/#Pool"><code>sync.Pool</code></a>.
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It provides an efficient mechanism for implementing certain types of caches whose memory
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can be reclaimed automatically by the system.
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</p>
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<p>
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TODO: crypto/tls: ServerName or InsecureSkipVerify (CL 67010043)
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possible breaking change
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</p>
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<h3 id="minor_library_changes">Minor changes to the library</h3>
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<p>
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@ -163,34 +197,72 @@ See the relevant package documentation for more information about each change.
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<ul>
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<li> TODO: cmplx.Pow(0, x): https://codereview.appspot.com/76940044</li>
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<li> TODO: crypto/tls: ServerName or InsecureSkipVerify (CL 67010043)</li>
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<li>
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The complex power function, <a href="/pkg/math/cmplx/#Pow"><code>Pow</code></a>,
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now specifies the behavior when the first argument is zero. It was undefined before.
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The details are in the <a href="/pkg/math/cmplx/#Pow">documentation for the function</a>.
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</li>
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<li> TODO: crypto/tls: add DialWithDialer (CL 68920045)</li>
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<li> TODO: crypto/tls: report TLS version in ConnectionState (CL 68250043)</li>
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<li> TODO: crypto/x509: support CSRs (CL 49830048)</li>
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<li> TODO: fmt %F: 77580044</li>
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<li> TODO: liblink: pull linker i/o into separate liblink C library (CL 35790044)</li>
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<li>
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The formatted print functions of the <code>fmt</code> package now define <code>%F</code>
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as a synonym for <code>%f</code> when printing floating-point values.
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</li>
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<li> TODO: net/http: add Request.TLS (CL 52660047)</li>
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<li> TODO: net/http: add Server.ErrorLog; log and test TLS handshake errors (CL 70250044)</li>
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<li> TODO: net/http: add Server.SetKeepAlivesEnabled (CL 69670043)</li>
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<li> TODO: net/http: add Transport.TLSHandshakeTimeout; set it by default (CL 68150045)</li>
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<li> TODO: net/http: add optional Server.ConnState callback (CL 69260044)</li>
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<li> TODO: net/http: use TCP Keep-Alives on DefaultTransport's connections (CL 68330046)</li>
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<li> TODO: net/http: use TCP keep-alives for ListenAndServe and ListenAndServeTLS (CL 48300043)</li>
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<li> TODO: net: add Dialer.KeepAlive option (CL 68380043)</li>
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<li> TODO: net: enable fast socket creation using SOCK_CLOEXEC and Accept4 on FreeBSD 10 (69100043)</li>
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<li> TODO: os/exec: fix Command with relative paths (CL 59580044)</li>
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<li> TODO: regexp: add one-pass optimization from RE2 (CL 13345046)</li>
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<li> TODO: runtime/debug: add SetPanicOnFault (CL 66590044)</li>
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<li> TODO: runtime: output how long goroutines are blocked (CL 50420043)</li>
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<li> TODO: runtime: better handling of defers, reduces goroutine memory footprint by 2K (CL 42750044)</li>
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<li> TODO: runtime: faster GC: concurrent sweep, better parallelization, 8K pages (up to 50-70% pause reduction) (CL 46430043, 46860043, 58230043)</li>
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<li> TODO: runtime/race: faster by ~40% (CL 55100044)</li>
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<li> TODO: strconv.CanBackquote rejects U+007F CL 77300043</li>
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<li>
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The <a href="/pkg/os/exec/"><code>os/exec</code></a> package now implements
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what the documentation has always said with regard to relative paths for the binary.
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In particular, it only calls <a href="/pkg/os/exec/#LookPath"><code>LookPath</code></a>
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when the binary's file name contains no path separators.
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</li>
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<li>
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The <a href="/pkg/strconv/#CanBackquote"><code>CanBackquote</code></a>
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function in the <a href="/pkg/strconv/"><code>strconv</code></a> package
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now considers the <code>DEL</code> character, <code>U+007F</code>, to be
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non-printing.
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</li>
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<li> TODO: syscall: add Accept4 for freebsd (CL 68880043)</li>
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<li> TODO: syscall: add NewCallbackCDecl to use for windows callbacks (CL 36180044)</li>
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<li> TODO: syscall: add support for FreeBSD 10 (CL 56770044, 56980043)</li>
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<li> TODO: testing: add b.RunParallel function (CL 57270043)</li>
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<li> TODO: testing: diagnose buggy tests that panic(nil) (CL 55780043)</li>
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<li> TODO: unicode: upgrade from Unicode 6.2.0 to 6.3.0 (CL 65400044)</li>
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<li>
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The <a href="/pkg/testing/"><code>testing</code></a> package now
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diagnoses tests that call <code>panic(nil)</code>, which is almost always erroneous.
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</li>
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<li>
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The <a href="/pkg/unicode/"><code>unicode</code></a> package and associated
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support throughout the system has been upgraded from
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Unicode 6.2.0 to <a href="http://www.unicode.org/versions/Unicode6.3.0/">Unicode 6.3.0</a>.
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</li>
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</ul>
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