Here are proposed semantics for the tracefile-size/tracefile-count
enable-channel options (are they still planned for later inclusion in
lttng-tools?):
-C, --tracefile-size SIZE
This is a recent proposal (2013-Mar-08) that has yet to be added to the
command. Maximum size of each stored trace file (local or remote). Default is
zero, which means no limitation. When set, each trace file is chopped into
sequentially numbered segments of at most SIZE bytes each (e.g. "channel0_0"
becomes "channel0_0_0", "channel0_0_1", etc.). SIZE must be at least as large
as the sub-buffer size. The option is most useful if -W, --tracefile-count is
also set.
-W, --tracefile-count NUM
This is a recent proposal (2013-Mar-08) that has yet to be added to the
command. Maximum number of stored trace file chunks (local or remote).
Default is zero, which means no limitation. When set, once the number of trace
file segments reaches NUM the first segments are re-used (overwritten),
creating an on-disc circular buffer of sorts. The option has no effect unless
the -C, --tracefile-size option is also set.
Note that when -C is set but -W is not (or if -W is set to 1), this means
the single trace file gets overwritten after each SIZE bytes.
Daniel U. Thibault
R & D pour la défense Canada - Valcartier (RDDC Valcartier) / Defence R&D
Canada - Valcartier (DRDC Valcartier)
Cyber sécurité pour les missions essentielles (CME) / Mission Critical Cyber
Security (MCCS)
Protection des systèmes et contremesures (PSC) / Systems Protection &
Countermeasures (SPC)
2459 route de la Bravoure
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Gouvernement du Canada / Government of Canada
<http://www.valcartier.drdc-rddc.gc.ca/>
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