From 9a81b28598fadc44bf506354c9227e41aac786f6 Mon Sep 17 00:00:00 2001 From: Henrik Nord Date: Wed, 13 May 2015 09:40:16 +0200 Subject: Revert "Prepare release" This reverts commit e09dd66dc4d89c62ddfd8c19791f9678d5d787c6. --- erts/doc/src/notes.xml | 502 ------------------------------------------------- 1 file changed, 502 deletions(-) (limited to 'erts') diff --git a/erts/doc/src/notes.xml b/erts/doc/src/notes.xml index c85cbe543d..35e6e55e72 100644 --- a/erts/doc/src/notes.xml +++ b/erts/doc/src/notes.xml @@ -30,508 +30,6 @@

This document describes the changes made to the ERTS application.

-
Erts 7.0 - -
Fixed Bugs and Malfunctions - - -

- Fix issuing with spaces and quoting in the arguments when - using erlang:open_port spawn_executable on windows. The - behavior now mimics how unix works. This change implies a - backwards incompatibility for how spawn_executable works - on windows.

-

- *** POTENTIAL INCOMPATIBILITY ***

-

- Own Id: OTP-11905

- - -

- Fix global call trace when hipe compiled code call beam - compiled functions. Tracing of beam functions should now - alway work regardless who the caller is.

-

- Own Id: OTP-11939

- - -

- Correct cache alignment for ETS write_concurrency - locks to improve performance by reduced false sharing. - May increase memory footprint for tables with - write_concurrency.

-

- Own Id: OTP-11974

- - -

- All possibly blocking operations in the fd/spawn and - terminal driver have been converted to non-blocking - operations. Before this fix it was possible for the VM to - be blocked for a long time if the entity consuming - stdout/stderr did not consume it fast enough.

-

- Own Id: OTP-12239

- - -

- Add missing overhead for offheap binaries created from - external format. This fix can improve the garbage - collection of large binaries originating from - binary_to_term or messages from remote nodes.

-

- Own Id: OTP-12554

- - -

- Ensure hashing of zero is consistent

-

Erlang treats positive and negative zero as - equal:

-

- true = 0.0 =:= 0.0/-1

-

However, Erlangs hash functions: hash, phash and - phash2 did not reflect this behaviour. The hash values - produced by the different hash functions would not be - identical for positive and negative zero.

This - change ensures that hash value of positive zero is always - produced regardless of the signedness of the zero float, - i.e.,

-

- true = erlang:phash2(0.0) =:= - erlang:phash2(0.0/-1)

-

- Own Id: OTP-12641

- - -

- Ensure NIF term creation disallows illegal floating point - values and too long atoms. Such values will cause a NIF - to throw badarg exception when it returns.

-

- Own Id: OTP-12655

- - -

- Fixed building of Map results from match_specs

-

- A faulty "box-value" entered into the heap which could - cause a segmentation fault in the garbage collector if it - was written on a heap fragment.

-

- Own Id: OTP-12656

- - -

- Fix hipe bug when matching a "writable" binary. The bug - has been seen to sometimes cause a failed binary matching - of a correct utf8 character, but other symptoms are also - possible.

-

- Own Id: OTP-12667

- - -

- Keep dirty schedulers from waking other schedulers.

-

- Own Id: OTP-12685

- - -

- Disable floating point exceptions if the VM is compiled - by clang/llvm. This is a known long-standing problem in - clang/llvm.

-

- Own Id: OTP-12717

- - -

- Fix bug in file:sendfile for FreeBSD causing not - the entire file to be sent.

-

- Own Id: OTP-12720

- - -
- - -
Improvements and New Features - - -

- Add md5 and module entries to - ?MODULE:module_info/0/1 and remove obsolete entry - 'import'.

-

- *** POTENTIAL INCOMPATIBILITY ***

-

- Own Id: OTP-11940

- - -

- Debug function erlang:display/1 shows content of - binaries and bitstrings, not only the length.

-

- Own Id: OTP-11941

- - -

The time functionality of Erlang has been extended. - This both includes a new - API for time, as well as time warp - modes which alters the behavior of the system - when system time changes. You are strongly encouraged - to use the new API instead of the old API based on - erlang:now/0. - erlang:now/0 has been deprecated since it is and - forever will be a scalability bottleneck. For more - information see the Time and Time - Correction chapter of the ERTS User's - Guide.

-

Besides the API changes and time warp modes a lot of - scalability and performance improvements regarding time - management has been made internally in the runtime - system. Examples of such improvements are scheduler - specific timer wheels, scheduler specific BIF timer - management, parallel retrieval of monotonic time and - system time on systems with primitives that are not - buggy.

-

- Own Id: OTP-11997

- - -

erlang:function_exported(M, F, A) will now - return true if M:F/A refers to a BIF.

-

- *** POTENTIAL INCOMPATIBILITY ***

-

- Own Id: OTP-12099

- - -

- New BIF: erlang:get_keys/0, lists all keys - associated with the process dictionary. Note: - erlang:get_keys/0 is auto-imported.

-

- *** POTENTIAL INCOMPATIBILITY ***

-

- Own Id: OTP-12151 Aux Id: seq12521

- - -

- Make distributed send of large messages yield to improve - real-time characteristics.

-

- Own Id: OTP-12232

- - -

- Use high accuracy poll timeouts

-

- Where available, use poll/select API's that can handle - time resolutions less than 1ms. In the cases where such - API's are not available the timeout is rounded up to the - nearest ms.

-

- Own Id: OTP-12236

- - -

- The internal group to user_drv protocol has been changed - to be synchronous in order to guarantee that output sent - to a process implementing the user_drv protocol is - printed before replying. This protocol is used by the - standard_output device and the ssh application when - acting as a client.

-

- This change changes the previous unlimited buffer when - printing to standard_io and other devices that end up in - user_drv to 1KB.

-

- *** POTENTIAL INCOMPATIBILITY ***

-

- Own Id: OTP-12240

- - -

The previously introduced "eager check I/O" feature is - now enabled by default.

-

Eager check I/O can be disabled using the erl - command line argument: +secio false

-

Characteristics impact compared to previous - default:

Lower latency and smoother - management of externally triggered I/O operations. - A slightly reduced priority of externally triggered - I/O operations. -

- Own Id: OTP-12254 Aux Id: OTP-12117

- - -

- Properly support maps in match_specs

-

- Own Id: OTP-12270

- - -

- The notice that a crashdump has been written has been - moved to be printed before the crashdump is generated - instead of afterwords. The wording of the notice has also - been changed.

-

- *** POTENTIAL INCOMPATIBILITY ***

-

- Own Id: OTP-12292

- - -

- New function ets:take/2. Works the same as - ets:delete/2 but also returns the deleted - object(s).

-

- Own Id: OTP-12309

- - -

- Tracing with cpu_timestamp option has been enabled on - Linux.

-

- Own Id: OTP-12366

- - -

- ets:info/1,2 now contains information about whether - write_concurrency or read_concurrency is enabled.

-

- Own Id: OTP-12376

- - -

- Improved usage of gcc's builtins for atomic memory - access. These are used when no other implementation of - atomic memory operations is available. For example, when - compiling for ARM when libatomic_ops is not - available.

-

- The largest improvement will be seen when compiling with - a gcc with support for the __atomic_* - builtins (using a gcc of at least version 4.7), - but also when only the legacy __sync_* builtins - are available (using a gcc of at least version - 4.1) an improvement can be seen.

-

- For more information see the "Atomic - Memory Operations and the VM" section of - $ERL_TOP/HOWTO/INSTALL.md.

-

- Own Id: OTP-12383

- - -

- Introduce math:log2/1 function to math module.

-

- Own Id: OTP-12411

- - -

- Remove perfctr support

-

- Development of perfctr in the linux kernel ceased in - 2010. The perfctr support code in the Erlang VM is thus - effectively dead code and therefor removed.

-

- Own Id: OTP-12508

- - -

zlib:inflateChunk/2 has been added. It works - like zlib:inflate/2, but decompresses no more data - than will fit in the buffer configured by - zlib:setBufSize/2.

-

- Own Id: OTP-12548

- - -

- Use linear search for small select_val arrays

-

- Own Id: OTP-12555

- - -

- New BIF ets:update_counter/4 with a default object as - argument, which will be inserted in the table if the key - was not found.

-

- Own Id: OTP-12563

- - -

- Export missing types from zlib module

-

- Own Id: OTP-12584

- - -

- Use persistent hashmaps for large Maps

Maps will use a - persistent hashmap implementation when the number of - pairs in a Map becomes sufficiently large. The change - will occur when a Map reaches 33 pairs in size but this - limit might change in the future.

-

The most significant impact for the user by this - change is speed, and to a lesser degree memory - consumption and introspection of Maps. Memory consumption - size is probalistic but lesser than gb_trees or - dict for instance. Any other impacts will be - transparent for the user except for the following - changes.

-

Semantics of Maps have changed in two incompatible - ways compared to the experimental implementation in OTP - 17:

Hashing of maps is done different by - erlang:phash2/1,2, erlang:phash/1 and - erlang:hash/2. Comparing two maps - with ==, /=, =<, <, >= and >, is done - different if the keys contain floating point - numbers. -

- *** POTENTIAL INCOMPATIBILITY ***

-

- Own Id: OTP-12585

- - -

- Scalability improvement for erlang:make_ref/0, - and other functionality that create references. Each - scheduler now manage its own set of references. By this - no communication at all is needed when creating - references.

-

- Previous implementation generated a strictly - monotonically increasing sequence of references - corresponding to creation time on the runtime system - instance. This is not the case with current - implementation. You can only expect reference to be - unique. The Erlang/OTP documentation has never mentioned - anything else but the uniqueness property, so this change - is fully compatible. The only reason we've - marked this as a potential incompatibility is since an - early draft for an Erlang specification mentions strict - monotonicity as a property.

-

- If you need to create data with a strict monotonicity - property use erlang:unique_integer([monotonic]). - Do not use the deprecated erlang:now().

-

- *** POTENTIAL INCOMPATIBILITY ***

-

- Own Id: OTP-12610

- - -

- Enable different abort signal from heart

-

By using environment variable HEART_KILL_SIGNAL, heart - can now use a different signal to kill the old running - Erlang.

-

By default the signal is SIGKILL but SIGABRT may also - be used by setting environment variable: - HEART_KILL_SIGNAL=SIGABRT

-

- Own Id: OTP-12613 Aux Id: seq12826

- - -

- Update autconf to latest version 2015-03-04

-

- Own Id: OTP-12646

- - -

- Optimization of timers internally in the VM. This include - process timers (receive ... after), port timers - (driver_set_timer()) as well as BIF timers - (erlang:send_after()/erlang:start_timer()).

-

- Each scheduler thread now has its own lock-free timer - service instead of one locked central service. This - dramatically improves performance of timer management on - systems with a large amount of schedulers and timers.

-

- The timer service internal data structure has also been - optimized to be able to handle more timers than before. - That is, each timer service is by its self able to handle - more timers without dramatic performance loss than the - old centralized timer service.

-

- The API of BIF timers has also been extended. Timeout - values are for example no longer limited to 32-bit - integers. For more information see the documentation of - erlang:start_timer/4, - erlang:send_after/4, - erlang:cancel_timer/2, - and erlang:read_timer/2.

-

- Own Id: OTP-12650 Aux Id: OTP-11997

- - -

- Specialize instructions from common assembler patterns

-

Specialize common instructions of rem, - band, minus and plus in the beam - loader. This will reduce the number of fetches and thus - lessen the instruction dispatch pressure during runtime - and speed up those operations in some common cases.

-

Specialize move patterns from x-registers to the stack - with a new move_window instruction. This change - will reduce instruction dispatch pressure.

-

- Own Id: OTP-12690

- - -

- Fix cross compilation for Android.

-

- Own Id: OTP-12693

- - -

- Fix incorrect use of autoconf macro AC_EGREP_CPP, which - could cause faulty configuration if run from a path - containing the string 'yes'.

-

- Own Id: OTP-12706

- - -

- Minimal Java version is now 1.6

-

- Own Id: OTP-12718

- - -

- Send format and args on process exit to error_logger

-

- Previously, the emulator would generate a whole string - with values and call the error_logger passing - "~s~n". This changes it to a format string - containing ~p with the respective values as - arguments.

-

- Own Id: OTP-12735

- - -
- -
-
Erts 6.4.1
Fixed Bugs and Malfunctions -- cgit v1.2.3