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<div class="moz-cite-prefix">On 3/26/19 8:47 AM, Kenneth Lundin
wrote:<br>
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cite="mid:CAOzgw90_2t0t_h8=ZFK+YmJdpqBxmfBwMpwhn4fihfN+XDTZ8w@mail.gmail.com">
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<h1>OTP 22 Release Candidate 2</h1>
<p>This is the second of three planned release candidates
before the OTP 22 release.</p>
<p>The intention with this release is to get feedback from our
users. All feedback is welcome, even if it is only to say
that it works for you, as it lets us know that the release
candidate got some testing.</p>
<p>Erlang/OTP 22 is a new major release with new features
and improvements as well as incompatibilities.</p>
<h2>Potential Incompatibilities</h2>
<ul>
<li>gen_* behaviours: If logging of the last N messages
through <span style="font-family:courier
new,courier,monospace">sys:log/2,3</span> is active for
the server, this log is included in the terminate report.</li>
<li>reltool: A new element, Opts, can now be included in a
rel tuple in the reltool release specific configuration
format: <span style="font-family:courier
new,courier,monospace">{rel, Name, Vsn, RelApps, Opts}</span>.</li>
<li>All external pids/ports/refs created by <span
style="font-family:courier new,courier,monospace">erlang:list_to_pid</span>
and similar functions now compare equal to any other
pid/port/ref with same number from that node.</li>
<li>The old legacy <span style="font-family:courier
new,courier,monospace">erl_interface</span> library is
deprecated as of OTP 22, and will be removed in OTP 23.
This does not apply to the <span
style="font-family:courier new,courier,monospace">ei</span>
library.</li>
<li>VxWorks is deprecated as of OTP 22 and will be removed
in OTP 23.</li>
</ul>
<h2>Additional highlights in release candidate 2</h2>
<ul>
<li>A simple socket API is provided through the <span
style="font-family:courier new,courier,monospace">socket</span>
module. This is a low level API that does *not* replace <span
style="font-family:courier new,courier,monospace">gen_[tcp|udp|sctp]</span>.
It is intended to *eventually* replace the inet driver. It
also provides a basic API that facilitates the
implementation of other protocols than TCP, UDP and SCTP.
Known issues are; No support for the Windows OS
(currently), a small term leakage. This feature will be
classed as experimental in OTP 22.</li>
<li>ssl: Basic support for TLS 1.3 Server for experimental
use.</li>
<li>In OTP 22, HiPE (the native code compiler) is not fully
functional. The reasons for this are new BEAM instructions
for binary matching that the HiPE native code compiler
does not support. If <span style="font-family:courier
new,courier,monospace">erlc</span> is invoked with the <span
style="font-family:courier new,courier,monospace">+native</span>
option, and if any of the new binary matching instructions
are used, the compiler will issue a warning and produce a
BEAM file without native code.</li>
<li>erts: Added the NIF function <span
style="font-family:courier new,courier,monospace">enif_term_type</span>,
which helps avoid long sequences of <span
style="font-family:courier new,courier,monospace">enif_is_xyz</span>
by returning the type of the given term. This is
especially helpful for NIFs that serialize terms, such as
JSON encoders, where it can improve both performance and
readability.</li>
<li>crypto: The new <span style="font-family:courier
new,courier,monospace">hash_info/1</span> and <span
style="font-family:courier new,courier,monospace">cipher_info/1</span>
functions returns maps with information about the hash or
cipher in the argument.</li>
</ul>
<h2>Highlights in release candidate 1</h2>
<h3>Erts:</h3>
<ul>
<li>Support for Erlang Distribution protocol to split the
payload of large signals into several fragments.</li>
<li>ETS option write_concurrency now also effects and
improves scalability of ordered_set tables.</li>
<li>The <span style="font-family:monospace,monospace">length/1</span>
BIF used to calculate the length of the list in one go
without yielding, even if the list was very long. Now it
yields when called with long lists.</li>
<li>A new (still experimental) module <span
style="font-family:courier new,courier,monospace">socket</span>
is introduced. It is implemented as a NIF and the idea is
that it shall be as "close as possible" to the OS level
socket interface.</li>
</ul>
<h3>Compiler:</h3>
<ul>
<li>The compiler has been rewritten to internally use an
intermediate representation based on Static Single
Assignment (SSA). The new intermediate representation
makes more optimizations possible.
<ul>
<li>The binary matching optimizations are now applicable
in many more circumstances than before.</li>
<li>Type optimizations are now applied across local
function calls, and will remove a lot more redundant
type tests than before.</li>
</ul>
</li>
<li>All compiler options that can be given in the source
file can now be given in the option list on the command
line for <span style="font-family:monospace,monospace">erlc</span>.</li>
</ul>
<h3>Standard libraries:</h3>
<ul>
<li>Cover now uses the counters module instead of <span
style="font-family:monospace,monospace">ets</span> for
updating counters. The new function <span
style="font-family:monospace,monospace">cover:local_only/0
</span>allows running Cover in a restricted but faster
local-only mode. The increase in speed will vary depending
on the type of code being cover-compiled, as an
example the compiler test suite runs more than twice as
fast with the new Cover.</li>
<li>SSL now uses the new logger API, including log levels
and verbose debug logging.</li>
</ul>
<p>For more details see<br>
<a href="http://erlang.org/download/otp_src_22.0-rc2.readme"
moz-do-not-send="true">http://erlang.org/download/otp_src_22.0-rc2.readme</a></p>
<p>Pre built versions for Windows can be fetched here:<br>
<a href="http://erlang.org/download/otp_win32_22.0-rc2.exe"
moz-do-not-send="true">http://erlang.org/download/otp_win32_22.0-rc2.exe</a><br>
<a href="http://erlang.org/download/otp_win64_22.0-rc2.exe"
moz-do-not-send="true">http://erlang.org/download/otp_win64_22.0-rc2.exe</a></p>
<p>Online documentation can be browsed here:<br>
<a href="http://erlang.org/documentation/doc-11.0-rc2/doc"
moz-do-not-send="true">http://erlang.org/documentation/doc-11.0-rc2/doc</a></p>
<p>The Erlang/OTP source can also be found at GitHub on the
official Erlang repository:</p>
<p><a href="https://github.com/erlang/otp"
moz-do-not-send="true">https://github.com/erlang/otp</a></p>
<p><a
href="https://github.com/erlang/otp/releases/tag/OTP-22.0-rc2"
moz-do-not-send="true">OTP-22.0-rc2</a></p>
Thank you for all your contributions!</div>
</div>
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</blockquote>
<tt>Hi Kenneth,</tt><br>
<tt></tt><br>
<tt>It looks like the Erlang Binary Term Format change previously
added in 19.0rc-1 was never documented (to cause the creation
integer to be 32bits for pids, ports and refs) though the new
format is being forced with a recent commit for 22.0rc-2
(<a class="moz-txt-link-freetext" href="https://github.com/erlang/otp/commit/78ea501bcc84bd8bd49da97e514c1c3b20682d86">https://github.com/erlang/otp/commit/78ea501bcc84bd8bd49da97e514c1c3b20682d86</a>).
The change wasn't announced in your email, nor the necessity of
the switch to NEW_PID_EXT/NEW_PORT_EXT/NEWER_REFERENCE_EXT for all
future Erlang integration.</tt><tt><br>
</tt><br>
<tt>Best Regards,</tt><br>
<tt>Michael</tt><br>
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