[erlang-questions] Erlang/OTP 20.1 has been released,

Henrik Nord X henrik.x.nord@REDACTED
Wed Sep 27 11:01:19 CEST 2017

Erlang/OTP 20.1 is the first service release for the 20 major release.
The service release contains mostly bug fixes and characteristics
improvements but also some new features.

Some highlights for 20.1

    crypto, public_key: Extend crypto and public_key functions sign and
verify with:
        support for RSASSA-PS padding for signatures and for
        saltlength setting
        X9.31 RSA padding.
        sha, sha224, sha256, sha384, and sha512 for dss
        signatures as mentioned in NIST SP 800-57 Part 1.
        ripemd160 to be used for rsa signatures.

    A new tuple in crypto:supports/0 reports supported MAC

        Add service option decode_format to allow incoming messages to
be decoded into maps
        instead of records.
        Decode performance has been improved.
        Add service/transport option avp_dictionaries to give better
support for dictionaries only defining AVPs.

    erts: Upgraded the ERTS internal PCRE library from version 8.40 to
version 8.41.

    erts, kernel, tools: Profiling with lock counting can now be fully
toggled at runtime in
    the lock counting emulator (-emu_type lcnt). Everything
    is enabled by default to match the old behavior, but
    specific categories can be toggled at will with minimal
    runtime overhead when disabled. Refer to the
    documentation on lcnt:rt_mask/1 for details.

    lcnt:collect and lcnt:clear will no longer block all
    other threads in the runtime system. This makes it possible to run
the lock counting
    under heavier load.

    erts: The zlib module has been refactored and all its operations
will now yield appropriately,
    allowing them to be used freely in concurrent applications.

    erts, tools: Add erlang:iolist_to_iovec/1, which converts an
    iolist() to an erlang:iovec(), which is suitable for use
    with enif_inspect_iovec().

    erts: Add new nif API functions for managing an I/O Queue.
    The added functions are: enif_ioq_create(), enif_ioq_destroy(),
    enif_ioq_enqv(), enif_ioq_deq(), enif_ioq_peek(),
enif_inspect_iovec(), enif_free_iovec()

        Reading of crash dumps with many binaries is optimized.
        A progress bar is shown when the detail view for a process is
        The cdv script now sets ERL_CRASH_DUMP_SECONDS=0 to
        avoid generating a new crash dump from the node running the
Crashdump Viewer.

    Add system statistics and limits to frontpage in

    public_key, ssl**:
    Improved error propagation and reports

    ssh: A new option modify_algorithms is implemented. It
    enables specifying changes on the default algorithms
    list. See the reference manual and the SSH User's Guide
    chapter "Configuring algorithms in SSH".

    tools/xref: The predefined Xref analysis locals_not_used now
    the -on_load() attribute and does not report unused functions.

    tools/fprof: When sampling multiple processes and analyzing
    with totals set to true, the output now sums together
    all caller and callee entries which concerns the same
    function. Previous behaviour was to report each
    contributing entry separately.

You can find the README and the full listing of changes for this
service release at


The source distribution and binary distributions for Windows can be
downloaded from


Note: To unpack the TAR archive you need a GNU TAR compatible program.

For installation instructions please consult the README file that is
of the distribution.

The Erlang/OTP source can also be found at GitHub on the official
repository, https://github.com/erlang/otp with tag OTP-20.1

The on-line documentation can be found at: http://www.erlang.org/doc/
You can also download the complete HTML documentation or the Unix
manual files


Please report any new issues via Erlang/OTPs public issue tracker


We want to thank all of those who sent us patches, suggestions and bug

Thank you!

The Erlang/OTP Team at Ericsson

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