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Persistent terms are useful for storing Erlang terms that are never
or infrequently updated. They have the following advantages:
* Constant time access. A persistent term is not copied when it is
looked up. The constant factor is lower than for ETS, and no locks
are taken when looking up a term.
* Persistent terms are not copied in garbage collections.
* There is only ever one copy of a persistent term (until it is
deleted). That makes them useful for storing configuration data
that needs to be easily accessible by all processes.
Persistent terms have the following drawbacks:
* Updates are expensive. The hash table holding the keys for the
persistent terms are updated whenever a persistent term is added,
updated or deleted.
* Updating or deleting a persistent term triggers a "global GC", which
will schedule a heap scan of all processes to search the heap of all
processes for the deleted term. If a process still holds a reference
to the deleted term, the process will be garbage collected and the
term copied to the heap of the process. This global GC can make the
system less responsive for some time.
Three BIFs (implemented in C in the emulator) is the entire
interface to the persistent term functionality:
* put(Key, Value) to store a persistent term.
* get(Key) to look up a persistent term.
* erase(Key) to delete a persistent term.
There are also two additional BIFs to obtain information about
persistent terms:
* info() to return a map with information about persistent terms.
* get() to return a list of a {Key,Value} tuples for all persistent
terms. (The values are not copied.)
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Log events issued via error_logger:info_msg or
error_logger:info_report are now forwarded to Logger with level
'notice' instead of 'info'.
Log events issued by gen_* behaviours are also changed from level
'info' to level 'notice'.
Progress reports are still 'info', and can therefore easily be
included/excluded by changing the primary log level. By default, they
are not logged.
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And add field 'module' in handler config.
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Also, change HandlerId from logger_simple to simple.
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This configuration option has been removed. logger_formatter will read
the utc_log configuration parameter and format the timestamp
accordingly.
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* siri/kernel/logger/OTP-13295:
Add documentation of the built-in logger handlers
Catch badarg in logger:get_format_depth/0
Add chars_limit option to logger_formatter
Don't kill logger process until all other processes are dead
Set call timeout for logger_server to infinity
Update primary bootstrap
Test cuddle for logger
Update cth_log_redirect to a logger handler
Start using logger internally in kernel and stdlib
Remove error_logger process and add logger process
Add logger
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* maint:
Updated OTP version
Prepare release
Update appup file for sasl
Fix bug in hybrid boot file used for restart_new_emulator
Conflicts:
OTP_VERSION
lib/sasl/src/sasl.appup.src
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The old hybrid did not update preloaded and mandatory module lists and
kernel processes.
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Communication between Erlang processes has conceptually always been
performed through asynchronous signaling. The runtime system
implementation has however previously preformed most operation
synchronously. In a system with only one true thread of execution, this
is not problematic (often the opposite). In a system with multiple threads
of execution (as current runtime system implementation with SMP support)
it becomes problematic. This since it often involves locking of structures
when updating them which in turn cause resource contention. Utilizing
true asynchronous communication often avoids these resource contention
issues.
The case that triggered this change was contention on the link lock due
to frequent updates of the monitor trees during communication with a
frequently used server. The signal order delivery guarantees of the
language makes it hard to change the implementation of only some signals
to use true asynchronous signaling. Therefore the implementations
of (almost) all signals have been changed.
Currently the following signals have been implemented as true
asynchronous signals:
- Message signals
- Exit signals
- Monitor signals
- Demonitor signals
- Monitor triggered signals (DOWN, CHANGE, etc)
- Link signals
- Unlink signals
- Group leader signals
All of the above already defined as asynchronous signals in the
language. The implementation of messages signals was quite
asynchronous to begin with, but had quite strict delivery constraints
due to the ordering guarantees of signals between a pair of processes.
The previously used message queue partitioned into two halves has been
replaced by a more general signal queue partitioned into three parts
that service all kinds of signals. More details regarding the signal
queue can be found in comments in the erl_proc_sig_queue.h file.
The monitor and link implementations have also been completely replaced
in order to fit the new asynchronous signaling implementation as good
as possible. More details regarding the new monitor and link
implementations can be found in the erl_monitor_link.h file.
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Include sys.config.src in release tar file
OTP-14950
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rb would fail to show an error_logger report which was not a
list. This is now corrected and any term is allowed (as specified in
the error_logger reference manual).
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* maint:
erts, stdlib: Fix xmllint warning
Update runtime deps to depend on new stdlib functionality
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* dgud/update-runtime-deps:
Update runtime deps to depend on new stdlib functionality
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~tw and new string functions are new since OTP-20 (stdlib-3.4)
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* siri/string-new-api: (28 commits)
hipe (test): Do not use deprecated functions in string(3)
dialyzer (test): Do not use deprecated functions in string(3)
eunit (test): Do not use deprecated functions in string(3)
system (test): Do not use deprecated functions in string(3)
system (test): Do not use deprecated functions in string(3)
mnesia (test): Do not use deprecated functions in string(3)
Deprecate old string functions
observer: Do not use deprecated functions in string(3)
common_test: Do not use deprecated functions in string(3)
eldap: Do not use deprecated functions in string(3)
et: Do not use deprecated functions in string(3)
os_mon: Do not use deprecated functions in string(3)
debugger: Do not use deprecated functions in string(3)
runtime_tools: Do not use deprecated functions in string(3)
asn1: Do not use deprecated functions in string(3)
compiler: Do not use deprecated functions in string(3)
sasl: Do not use deprecated functions in string(3)
reltool: Do not use deprecated functions in string(3)
kernel: Do not use deprecated functions in string(3)
hipe: Do not use deprecated functions in string(3)
...
Conflicts:
lib/eunit/src/eunit_lib.erl
lib/observer/src/crashdump_viewer.erl
lib/reltool/src/reltool_target.erl
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This can now be explicitly set by the 'sasl_error_logger'
configuration parameter, but if not set, the default encoding is now
utf8. When printing to this log, the Unicode translation modifier, t,
might be used in the format string.
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There is more to do.
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* siri/appups-21:
Update sasl/test/test_lib.hrl with recent versions of kernel and stdlib
Update appups in kernel, stdlib, and sasl for OTP-21.0
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Update erl_tar to support PAX format (redux)
OTP-14226
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This commit introduces the following key changes:
- Support for reading tar archives in formats currently in common use,
such as v7, STAR, USTAR, PAX, and GNU tar's extensions to the
STAR/USTAR format.
- Support for writing PAX archives, only when necessary, using USTAR
when possible for greater portability.
These changes result in lifting of some prior restrictions:
- Support for reading archives produced by modern tar implementations
when other restrictions described below are present.
- Support for filenames which exceed 100 bytes in length, or paths which
exceed 255 bytes (see USTAR format specification for more details on
this restriction).
- Support for filenames of arbitrary length
- Support for unicode metadata (the previous behaviour of erl_tar was
actually violating the spec, by writing unicode-encoded data to fields
which are defined to be 7-bit ASCII, even though this technically
worked when using erl_tar at source and destination, it may not have
worked with other tar utilities, and this implementation now conforms
to the spec).
- Support for uid/gid values which cannot be converted to octal
integers.
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Conflicts:
lib/sasl/test/systools_SUITE.erl
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When both options 'warnings_as_errors' and 'silent' were given to
systools:make_script or systools:make_relup, no error reason would be
returned if warnings occured. Instead only the atom 'error' was
returned. This is now corrected.
Options 'warnings_as_errors' and 'no_warn_sasl' are now also allowed
for systools:make_tar.
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* siri/appups-20.0:
Update sasl/test/test_lib.hrl with recent versions of kernel and stdlib
Update appups in kernel, stdlib and sasl for OTP-20
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The default value of 'mod' is '[]' and 'start_phases' is 'undefined'
in .app, but this value was not accepted if given in
the .app file. This is now corrected.
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