31 lines
1.5 KiB
ReStructuredText
31 lines
1.5 KiB
ReStructuredText
Diagnostic Log and Trace
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========================
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Diagnostic Log and Trace (DLT) is a logging mechanism defined and
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implemented by GENIVI: http://projects.genivi.org/diagnostic-log-trace/
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SyncEvolution optionally supports DLT as follows:
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* syncevo-dbus-server, syncevo-dbus-helper and syncevo-local-sync can
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log to DLT. Operations with "syncevolution --daemon=no" never use
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DLT.
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* Each of the three processes uses a different application ID. By
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default, these IDs are "SYNS", "SYNH", "SYNL". These default can be
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changed via configure options. All processes use just one context,
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with the fixed ID "SYNC".
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* syncevo-dbus-helper and syncevo-local-sync only run occasionally.
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This makes is hard to adjust their log levels, for example via the
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dlt-viewer, because the processes and their contexts are only shown
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(known?) while the processes run. To work around this, the initial
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log level of these two helpers are inherited from the
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log level of the "SYNC" context in syncevo-dbus-helper.
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* That log level defaults to "WARN", which ensures that normal runs
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produce no output.
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* To enable DLT support during compilation, use
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"--enable-dlt" and "--with-dlt-syncevolution=SYNS,SYNH,SYNL" where SYNS/H/L
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are the actual application IDs.
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* To enable DLT support at runtime, run syncevo-dbus-server with
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"--dlt". Logging to syslog should be disabled with "--no-syslog".
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* The hierarchical log from libsynthesis gets flattened into a flat
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stream of messages and no syncevolution-log.html files are written.
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