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error_logger implements a simple handler which is used when no other
handler is active. This handler is used during system startup, when
there is no guarantee that all modules are loaded and must therefore
not use any other modules for the formatting.
Commit 41b856a2cb270ef807beaa84afe1bb890de5f237 introduced a call to
io_lib:printable_list/1, which is now removed.
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If printable range is set to 'unicode', the simple error logger will now
recognize code points > 255 and print lists containing these as strings.
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Calling error_logger:limit_term/1 before sending terms as events to
the error_logger can be used for limiting the size of the messages.
Doing so will not change the output, but potentially save memory.
The Kernel variable error_logger_format_depth is used when limiting
the size of terms.
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Performance for processes that receive huge amounts of
messages can be increased by storing the incoming messages
outside the heap (that avoids copying the message in a
garbage collection).
Two OTP processes that are known to receive many messages
are 'rex' (used by 'rpc') and 'error_logger'.
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* legoscia/prettier-default-error-logger/OTP-13325:
Prettify default error_logger output somewhat
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The default error logger, the one in use before a more sophisticated
error logger can be installed, has rather terse output, in part because
it cannot rely on io:format. This patch attempts to improve the error
logger within that constraint:
- Print timestamps as YYYY-MM-DD HH:MM:SS
- For error reports with format strings, just print the format string
and the format arguments on separate lines
- For error reports with tuple lists, print each pair on a separate line
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If the file given by the Kernel application variable 'error_logger'
cannot be opened a crash will occur.
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