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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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* lukas/clean_doc_xmldir/OTP-15190:
docs: make clean all XMLDIR
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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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Added:
* logger:get_config() - replaces i(), returns all Logger
configuration, i.e. primary and handler config, and module levels
* logger:get_handler_ids() -> [HandlerId]
* logger:get_handler_config() -> [{HandlerId,Module,Config}]
Removed:
* logger:i/1, will probably be replaced in a later release.
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This reverts commit fd8e49b5bddceaae803670121b603b5eee8c5c08.
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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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Most logger configuration that was possible through
kernel application variables have been moved into a
common 'logger' application environment in kernel.
Now all the configuration possible through the logger
API can be done as sys config.
The handler started by kernel has been renamed to 'default'
instead of logger_std_h.
There is a new logger:setup_handlers/1 function that given an
application name can be used to setup handlers in other applications.
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This reverts commit 202bb737e3deabfebee683266f4b7c42781eb521.
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This reverts commit 345f7f527a4c26ef49cef0d81e2c8b71bf01ebc3.
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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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It is now explicitly stated that if the application type is `load`, the
application will not actually be restarted by the `restart_application`
instruction in relup, even if it is currently running. It will only be stopped
and re-loaded.
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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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* dgud/kernel/refc_sched_wall_time/OTP-11694:
test: spawn scheduler_wall_time flag holder
Turn on scheduler_wall_time in an alive process
Redirect system_flag(scheduler_wall_time,_) to kernel_refc
kernel: add a resource reference counter
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Can not start via rpc any more without spawning a keep alive process,
since it will stop collecting when process dies.
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