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Diffstat (limited to 'lib/observer/doc/src/ttb.xml')
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1 files changed, 281 insertions, 235 deletions
diff --git a/lib/observer/doc/src/ttb.xml b/lib/observer/doc/src/ttb.xml index 0b064b51b8..2b637551db 100644 --- a/lib/observer/doc/src/ttb.xml +++ b/lib/observer/doc/src/ttb.xml @@ -4,8 +4,7 @@ <erlref> <header> <copyright> - <year>2002</year> - <year>2013</year> + <year>2002</year><year>2016</year> <holder>Ericsson AB, All Rights Reserved</holder> </copyright> <legalnotice> @@ -25,28 +24,28 @@ </legalnotice> <title>ttb</title> - <prepared>Siri hansen</prepared> - <prepared>Bartlomiej Puzon</prepared> + <prepared>Siri Hansen, Bartlomiej Puzon</prepared> <responsible></responsible> <docno>1</docno> <approved></approved> <checked></checked> <date>2010-08-13</date> <rev>PA1</rev> - <file>ttb.sgml</file> + <file>ttb.xml</file> </header> <module>ttb</module> <modulesummary>A base for building trace tools for distributed systems.</modulesummary> <description> - <p>The Trace Tool Builder <c>ttb</c> is a base for building trace + <p>The Trace Tool Builder, <c>ttb</c>, is a base for building trace tools for distributed systems. </p> - <p>When using <c>ttb</c>, <c>dbg</c> shall not be used in parallel.</p> + <p>When using <c>ttb</c>, do not use module <c>dbg</c> in application + Runtime_Tools in parallel.</p> </description> <funcs> <func> <name>start_trace(Nodes, Patterns, FlagSpec, Opts) -> Result</name> - <fsummary>Start a trace port on each given node.</fsummary> + <fsummary>Start a trace port on each specified node.</fsummary> <type> <v>Result = see p/2</v> <v>Nodes = see tracer/2</v> @@ -58,49 +57,56 @@ </type> <desc> <p>This function is a shortcut allowing to start a trace with one command. Each - tuple in <c>Patterns</c> is converted to list which is in turn passed to - <c>ttb:tpl</c>. - The call:<code type="none"> -ttb:start_trace([Node, OtherNode], -[{mod, foo, []}, {mod, bar, 2}], -{all, call}, -[{file, File}, {handler,{fun myhandler/4, S}}])</code> - is equivalent to <code type="none"> -ttb:start_trace([Node, OtherNode], [{file, File}, {handler,{fun myhandler/4, S}}]), + tuple in <c>Patterns</c> is converted to a list, which in turn is passed to + <c>ttb:tpl/2,3,4</c>.</p> + <p>The call:</p> + <pre> +> <input>ttb:start_trace([Node, OtherNode], + [{mod, foo, []}, {mod, bar, 2}], + {all, call}, + [{file, File}, {handler,{fun myhandler/4, S}}]).</input></pre> + <p> is equivalent to:</p> + <pre> +> <input>ttb:start_trace([Node, OtherNode], + [{file, File}, {handler,{fun myhandler/4, S}}]), ttb:tpl(mod, foo, []), ttb:tpl(mod, bar, 2, []), -ttb:p(all, call)</code> - </p> +ttb:p(all, call).</input></pre> </desc> </func> + <func> <name>tracer() -> Result</name> - <fsummary>This is equivalent to tracer(node()).</fsummary> + <fsummary>Equivalent to tracer(node()).</fsummary> <desc> - <p>This is equivalent to <c>tracer(node())</c>.</p> + <p>Equivalent to <c>tracer(node())</c>.</p> </desc> </func> + <func> <name>tracer(Shortcut) -> Result</name> - <fsummary>Handy shortcuts for common tracing settings</fsummary> + <fsummary>Handy shortcuts for common tracing settings.</fsummary> <type> <v>Shortcut = shell | dbg</v> </type> <desc> + <p>Handy shortcuts for common tracing settings.</p> <p><c>shell</c> is equivalent to <c>tracer(node(),[{file, {local, "ttb"}}, shell])</c>.</p> <p><c>dbg</c> is equivalent to <c>tracer(node(),[{shell, only}])</c>.</p> </desc> </func> + <func> <name>tracer(Nodes) -> Result</name> - <fsummary>This is equivalent to tracer(Nodes,[]).</fsummary> + <fsummary>Equivalent to tracer(Nodes,[]).</fsummary> <desc> - <p>This is equivalent to <c>tracer(Nodes,[])</c>.</p> + <p>Equivalent to <c>tracer(Nodes,[])</c>.</p> </desc> </func> + <func> <name>tracer(Nodes,Opts) -> Result</name> - <fsummary>Start a trace port on each given node.</fsummary> + <fsummary>Start a trace port on each specified node.</fsummary> <type> <v>Result = {ok, ActivatedNodes} | {error,Reason}</v> <v>Nodes = atom() | [atom()] | all | existing | new</v> @@ -122,99 +128,109 @@ ttb:p(all, call)</code> <v>ShellSpec = true | false | only</v> </type> <desc> - <p>This function starts a file trace port on all given nodes - and also points the system tracer for sequential tracing to + <p>Starts a file trace port on all specified nodes + and points the system tracer for sequential tracing to the same port. </p> - <p>The given <c>Filename</c> will be prefixed with the node - name. Default <c>Filename</c> is "ttb". - </p> - <p><c>File={wrap,Filename,Size,Count}</c> can be used if - the size of the trace logs must be limited. Default values are - <c>Size=128*1024</c> and <c>Count=8</c>. - </p> - <p>When tracing diskless nodes, <c>ttb</c> must be started + <p><em>Options:</em></p> + <taglist> + <tag><c>Filename</c></tag> + <item><p>The specified <c>Filename</c> is prefixed with the node name. + Default <c>Filename</c> is <c>ttb</c>.</p></item> + <tag><c>File={wrap,Filename,Size,Count}</c></tag> + <item><p>Can be used if the size of the trace logs must be limited. + Default values are + <c>Size=128*1024</c> and <c>Count=8</c>.</p></item> + <tag><c>Client</c></tag> + <item><p>When tracing diskless nodes, <c>ttb</c> must be started from an external "trace control node" with disk access, and <c>Client</c> must be <c>{local, File}</c>. All trace information is then sent to the trace control node where - it is written to file. - </p> - <p>The <c>process_info</c> option indicates if process - information should be collected. If <c>PI = true</c> (which is + it is written to file.</p></item> + <tag><c>process_info</c></tag> + <item><p>Indicates if process + information is to be collected. If <c>PI = true</c> (which is default), each process identifier <c>Pid</c> is replaced by a tuple <c>{Pid,ProcessInfo,Node}</c>, where <c>ProcessInfo</c> - is the process' registered name its globally registered name, - or its initial function. It is possible to turn off this - functionality by setting <c>PI = false</c>. - </p> - <p>The <c>{shell, ShellSpec}</c> option indicates that the trace messages should - be printed on the console as they are received by the tracing - process. This implies <c>{local, File}</c> trace client. If the ShellSpec - is <c>only</c> (instead of <c>true</c>), no trace logs are stored. - </p> - <p>The <c>shell</c> option is a shortcut for <c>{shell, true}</c>.</p> - <p>The <c>timer</c> option indicates that the trace should be + is the registered process name, its globally registered name, + or its initial function. To turn off this functionality, + set <c>PI = false</c>.</p></item> + <tag><c>{shell, ShellSpec}</c></tag> + <item><p>Indicates that trace messages are to be printed on the + console as they are received by the tracing process. This implies + trace client <c>{local, File}</c>. If <c>ShellSpec</c> + is <c>only</c> (instead of <c>true</c>), no trace logs are stored.</p></item> + <tag><c>shell</c></tag> + <item><p>Shortcut for <c>{shell, true}</c>.</p></item> + <tag><c>timer</c></tag> + <item><p>Indicates that the trace is to be automatically stopped after <c>MSec</c> milliseconds. <c>StopOpts</c> - are passed to <c>ttb:stop/2</c> command if specified (default is <c>[]</c>). - Note that the timing is approximate, as delays related to + are passed to command <c>ttb:stop/2</c> if specified (default is <c>[]</c>). + Notice that the timing is approximate, as delays related to network communication are always present. The timer starts after - <c>ttb:p/2</c> is issued, so you can set up your trace patterns before. - </p> - <p>The <c>overload_check</c> option allows to enable overload + <c>ttb:p/2</c> is issued, so you can set up your trace patterns before.</p></item> + <tag><c>overload_check</c></tag> + <item><p>Allows to enable overload checking on the nodes under trace. <c>Module:Function(check)</c> - is performed each <c>MSec</c> milliseconds. If the check returns - <c>true</c>, the tracing is disabled on a given node.<br/> - <c>Module:Function</c> should be able to handle at least three - atoms: <c>init</c>, <c>check</c> and <c>stop</c>. <c>init</c> and - <c>stop</c> give the user a possibility to initialize and clean - up the check environment.<br/> - When a node gets overloaded, it is not possible to issue <c>ttb:p</c> - nor any command from the <c>ttb:tp</c> family, as it would lead to + is performed each <c>MSec</c> millisecond. If the check returns + <c>true</c>, the tracing is disabled on a specified node.</p> + <p><c>Module:Function</c> must be able to handle at least three + atoms: <c>init</c>, <c>check</c>, and <c>stop</c>. <c>init</c> and + <c>stop</c> allows you to initialize and clean + up the check environment.</p> + <p>When a node gets overloaded, it is not possible to issue <c>ttb:p/2</c> + or any command from the <c>ttb:tp/2,3,4</c> family, as it would lead to inconsistent tracing state (different trace specifications on - different node). - </p> - <p>The <c>flush</c> option periodically flushes all file trace - port clients (see <c>dbg:flush_trace_port/1</c>). When enabled, - the buffers are freed each <c>MSec</c> milliseconds. This option is - not allowed with <c>{file, {local, File}}</c> tracing. - </p> - <p><c>{resume, FetchTimeout}</c> enables the autoresume feature. - Whenever enabled, remote nodes try to reconnect to the controlling node - in case they were restarted. The feature requires <c>runtime_tools</c> - application to be started (so it has to be present in the <c>.boot</c> - scripts if the traced nodes run with embedded erlang). If this is - not possible, resume may be performed manually by starting - <c>runtime_tools</c> remotely using <c>rpc:call/4</c>.<br/> - <c>ttb</c> tries to fetch all logs from a reconnecting node before - reinitializing the trace. This has to finish within FetchTimeout milliseconds - or is aborted<br/> - By default, autostart information is stored in a file called + different nodes).</p></item> + <tag><c>flush</c></tag> + <item><p>Periodically flushes all file trace + port clients (see + <seealso marker="runtime_tools:dbg#flush_trace_port/1"> + <c>dbg:flush_trace_port/1</c></seealso>). When enabled, + the buffers are freed each <c>MSec</c> millisecond. This option is + not allowed with <c>{file, {local, File}}</c> tracing.</p></item> + <tag><c>{resume, FetchTimeout}</c></tag> + <item><p>Enables the autoresume feature. + When enabled, remote nodes try to reconnect to the controlling node + if they are restarted. The feature requires application Runtime_Tools + to be started (so it has to be present in the <c>.boot</c> + scripts if the traced nodes run with embedded Erlang). If this is + not possible, resume can be performed manually by starting + <c>Runtime_Tools</c> remotely using + <seealso marker="kernel:rpc#call/4"><c>rpc:call/4</c></seealso>.</p> + <p><c>ttb</c> tries to fetch all logs from a reconnecting node before + reinitializing the trace. This must finish within <c>FetchTimeout</c> + milliseconds or is aborted.</p> + <p>By default, autostart information is stored in a file named <c>ttb_autostart.bin</c> on each node. If this is not desired - (i.e. on diskless nodes), a custom module to handle autostart + (for example, on diskless nodes), a custom module handling autostart information storage and retrieval can be provided by specifying - <c>ttb_autostart_module</c> environment variable for the <c>runtime_tools</c> - application. The module has to respond to the following API: - <taglist> + environment variable <c>ttb_autostart_module</c> for the application + Runtime_Tools. The module must respond to the following API:</p> + <taglist> <tag><c>write_config(Data) -> ok</c></tag> - <item>Store the provided data for further retrieval. It is + <item><p>Stores the provided data for further retrieval. It is important to realize that the data storage used must not - be affected by the node crash.</item> + be affected by the node crash.</p></item> <tag><c>read_config() -> {ok, Data} | {error, Error}</c></tag> - <item>Retrieve configuration stored with <c>write_config(Data)</c>.</item> + <item><p>Retrieves configuration stored with <c>write_config(Data)</c>.</p></item> <tag><c>delete_config() -> ok</c></tag> - <item>Delete configuration stored with <c>write_config(Data)</c>. - Note that after this call any subsequent calls to <c>read_config</c> - must return <c>{error, Error}</c>. + <item><p>Deletes configuration stored with <c>write_config(Data)</c>. + Notice that after this call any subsequent calls to <c>read_config</c> + must return <c>{error, Error}</c>.</p> </item> - </taglist> - </p> - <p>The <c>resume</c> option implies the default <c>FetchTimeout</c>, which is + </taglist> + <p><c>resume</c> implies the default <c>FetchTimeout</c>, which is 10 seconds</p> + </item> + </taglist> + </desc> </func> + <func> <name>p(Procs,Flags) -> Return</name> - <fsummary>Sets the given trace flags on the given processes.</fsummary> + <fsummary>Set the specified trace flags on the specified processes.</fsummary> <type> <v>Return = {ok,[{Procs,MatchDesc}]}</v> <v>Procs = Process | [Process] | all | new | existing</v> @@ -222,58 +238,64 @@ ttb:p(all, call)</code> <v>Flags = Flag | [Flag]</v> </type> <desc> - <p>This function sets the given trace flags on the given - processes. The <c>timestamp</c> flag is always turned on. + <p>Sets the specified trace flags on the specified + processes. Flag <c>timestamp</c> is always turned on. </p> - <p>Please turn to the Reference manual for module <c>dbg</c> - for details about the possible trace flags. The parameter - <c>MatchDesc</c> is the same as returned from <c>dbg:p/2</c></p> - <p>Processes can be given as registered names, globally - registered names or process identifiers. If a registered name - is given, the flags are set on processes with this name on all + <p>See the Reference Manual for module + <seealso marker="runtime_tools:dbg"><c>dbg</c></seealso> + and the possible trace flags. Parameter + <c>MatchDesc</c> is the same as returned from + <c>dbg:p/2</c>.</p> + <p>Processes can be specified as registered names, globally + registered names, or process identifiers. If a registered name + is specified, the flags are set on processes with this name on all active nodes.</p> - <p>Issuing this command starts the timer for this trace if - <c>timer</c> option was specified with <c>tracer/2</c>. + <p>Issuing this command starts the timer for this trace if option + <c>timer</c> is specified with <c>tracer/2</c>. </p> </desc> </func> + <func> <name>tp, tpl, ctp, ctpl, ctpg</name> <fsummary>Set and clear trace patterns.</fsummary> <desc> - <p>These functions should be used in combination with the - <c>call</c> trace flag for setting and clearing trace - patterns. When the <c>call</c> trace flag is set on a process, - function calls will be traced on that process if a trace - pattern has been set for the called function. Trace patterns - specifies how to trace a function by using match + <p>These functions are to be used with + trace flag <c>call</c> for setting and clearing trace + patterns. When trace flag <c>call</c> is set on a process, + function calls are traced on that process if a trace + pattern is set for the called function. Trace patterns + specify how to trace a function by using match specifications. Match specifications are described in the - User's Guide for the erlang runtime system <c>erts</c>. + <seealso marker="erts:users_guide"><c>ERTS User's Guide</c></seealso>. </p> <p>These functions are equivalent to the corresponding - functions in <c>dbg</c>, but all calls are stored in the - history. The history buffer makes it easy to create config - files so that the same trace environment can be setup several - times, e.g. if you want to compare two test runs. It also + functions in module + <seealso marker="runtime_tools:dbg">dbg</seealso>, + but all calls are stored in the + history. The history buffer makes it easy to create configuration + files; the same trace environment can be set up many + times, for example, to compare two test runs. It also reduces the amount of typing when using <c>ttb</c> from the - erlang shell. + Erlang shell. </p> <taglist> <tag><c>tp</c></tag> - <item>Set trace pattern on global function calls</item> + <item><p>Sets trace patterns on global function calls.</p></item> <tag><c>tpl</c></tag> - <item>Set trace pattern on local and global function calls</item> + <item><p>Sets trace patterns on local and global function calls.</p></item> <tag><c>ctp</c></tag> - <item>Clear trace pattern on local and global function - calls</item> + <item><p>Clears trace patterns on local and global function + calls.</p></item> <tag><c>ctpl</c></tag> - <item>Clear trace pattern on local function calls</item> + <item><p>Clears trace patterns on local function calls.</p></item> <tag><c>ctpg</c></tag> - <item>Clear trace pattern on global function calls</item> + <item><p>Clears trace patterns on global function calls.</p></item> </taglist> - <p>With <c>tp</c> and <c>tpl</c> one of match specification shortcuts - may be used (example: <c>ttb:tp(foo_module, caller)</c>). The shortcuts are: - <taglist> + <p>With <c>tp</c> and <c>tpl</c>, one of the match specification shortcuts + can be used (for example, <c>ttb:tp(foo_module, caller)</c>).</p> + <p>The shortcuts are as follows:</p> + <list type="bulleted"> <item><c>return</c> - for <c>[{'_',[],[{return_trace}]}]</c> (report the return value)</item> <item><c>caller</c> - for <c>[{'_',[],[{message,{caller}}]}]</c> @@ -281,34 +303,36 @@ ttb:p(all, call)</code> <item><c>{codestr, Str}</c> - for <c>dbg:fun2ms/1</c> arguments passed as strings (example: <c>"fun(_) -> return_trace() end"</c>) </item> - </taglist> - </p> + </list> </desc> </func> + <func> <name>list_history() -> History</name> - <fsummary>Returns all calls stored in history</fsummary> + <fsummary>Return all calls stored in history.</fsummary> <type> <v>History = [{N,Func,Args}]</v> </type> <desc> <p>All calls to <c>ttb</c> is stored in the history. This function returns the current content of the history. Any entry - can be re-executed with <c>run_history/1</c> or stored in a - config file with <c>write_config/2/3</c>.</p> + can be reexecuted with <c>run_history/1</c> or stored in a + configuration file with <c>write_config/2,3</c>.</p> </desc> </func> + <func> <name>run_history(N) -> ok | {error, Reason}</name> - <fsummary>Executes one entry of the history</fsummary> + <fsummary>Execute one entry of the history.</fsummary> <type> <v>N = integer() | [integer()]</v> </type> <desc> - <p>Executes the given entry or entries from the history - list. History can be listed with <c>list_history/0</c>.</p> + <p>Executes the specified entry or entries from the history + list. To list history, use <c>list_history/0</c>.</p> </desc> </func> + <func> <name>write_config(ConfigFile,Config)</name> <fsummary>Equivalent to write_config(ConfigFile,Config,[]).</fsummary> @@ -316,9 +340,10 @@ ttb:p(all, call)</code> <p>Equivalent to <c>write_config(ConfigFile,Config,[])</c>.</p> </desc> </func> + <func> <name>write_config(ConfigFile,Config,Opts) -> ok | {error,Reason}</name> - <fsummary>Creates a config file.</fsummary> + <fsummary>Create a configuration file.</fsummary> <type> <v>ConfigFile = string()</v> <v>Config = all | [integer()] | [{Mod,Func,Args}]</v> @@ -329,92 +354,97 @@ ttb:p(all, call)</code> <v>Opt = append</v> </type> <desc> - <p>This function creates or extends a config file which can be + <p>Creates or extends a configuration file, which can be used for restoring a specific configuration later. </p> - <p>The content of the config file can either be fetched from - the history or given directly as a list of + <p>The contents of the configuration file can either be fetched from + the history or specified directly as a list of <c>{Mod,Func,Args}</c>. </p> - <p>If the complete history is to be stored in the config file - <c>Config</c> should be <c>all</c>. If only a selected number - of entries from the history should be stored, <c>Config</c> - should be a list of integers pointing out the entries to be + <p>If the complete history is to be stored in the configuration file, + <c>Config</c> must be <c>all</c>. If only a selected number + of entries from the history are to be stored, <c>Config</c> + must be a list of integers pointing out the entries to be stored. </p> - <p>If <c>Opts</c> is not given or if it is <c>[]</c>, + <p>If <c>Opts</c> is not specified or if it is <c>[]</c>, <c>ConfigFile</c> is deleted and a new file is created. If - <c>Opts = [append]</c>, <c>ConfigFile</c> will not be deleted. - The new information will be appended at the end of the file.</p> + <c>Opts = [append]</c>, <c>ConfigFile</c> is not deleted. + The new information is appended at the end of the file.</p> </desc> </func> + <func> <name>run_config(ConfigFile) -> ok | {error,Reason}</name> - <fsummary>Executes all entries in a config file.</fsummary> + <fsummary>Execute all entries in a configuration file.</fsummary> <type> <v>ConfigFile = string()</v> </type> <desc> - <p>Executes all entries in the given config file. Note that the history - of the last trace is always available in the file named - <c>ttb_last_config</c>.</p> + <p>Executes all entries in the specified configuration file. + Notice that the history of the last trace is always available + in file <c>ttb_last_config</c>.</p> </desc> </func> + <func> <name>run_config(ConfigFile,NumList) -> ok | {error,Reason}</name> - <fsummary>Executes selected entries from a config file.</fsummary> + <fsummary>Execute selected entries from a configuration file.</fsummary> <type> <v>ConfigFile = string()</v> <v>NumList = [integer()]</v> </type> <desc> - <p>Executes selected entries from the given config + <p>Executes selected entries from the specified configuration file. <c>NumList</c> is a list of integers pointing out the entries to be executed. </p> - <p>The content of a config file can be listed with + <p>To list the contents of a configuration file, use <c>list_config/1</c>.</p> - <p> Note that the history - of the last trace is always available in the file named - <c>ttb_last_config</c>.</p> + <p>Notice that the history of the last trace is always available + in file <c>ttb_last_config</c>.</p> </desc> </func> + <func> <name>list_config(ConfigFile) -> Config | {error,Reason}</name> - <fsummary>Lists all entries in a config file.</fsummary> + <fsummary>List all entries in a configuration file.</fsummary> <type> <v>ConfigFile = string()</v> <v>Config = [{N,Func,Args}]</v> </type> <desc> - <p>Lists all entries in the given config file.</p> + <p>Lists all entries in the specified configuration file.</p> </desc> </func> + <func> <name>write_trace_info(Key,Info) -> ok</name> - <fsummary>Writes any information to the <c>.ti</c>file.</fsummary> + <fsummary>Write any information to file <c>.ti</c>.</fsummary> <type> <v>Key = term()</v> <v>Info = Data | fun() -> Data</v> <v>Data = term()</v> </type> <desc> - <p>The <c>.ti</c> file contains <c>{Key,ValueList}</c> - tuples. This function adds <c>Data</c> to the ValueList + <p>File <c>.ti</c> contains <c>{Key,ValueList}</c> + tuples. This function adds <c>Data</c> to the <c>ValueList</c> associated with <c>Key</c>. All information written with this - function will be included in the call to the format handler.</p> + function is included in the call to the format handler.</p> </desc> </func> + <func> <name>seq_trigger_ms() -> MatchSpec</name> - <fsummary>Equivalent to seq_trigger_ms(all)</fsummary> + <fsummary>Equivalent to seq_trigger_ms(all).</fsummary> <desc> - <p>Equivalent to <c>seq_trigger_ms(all)</c></p> + <p>Equivalent to <c>seq_trigger_ms(all)</c>.</p> </desc> </func> + <func> <name>seq_trigger_ms(Flags) -> MatchSpec</name> - <fsummary>Returns a match_spec() which starts sequential tracing</fsummary> + <fsummary>Return a match_spec() which starts sequential tracing.</fsummary> <type> <v>MatchSpec = match_spec()</v> <v>Flags = all | SeqTraceFlag | [SeqTraceFlag]</v> @@ -422,54 +452,55 @@ ttb:p(all, call)</code> </type> <desc> <p>A match specification can turn on or off sequential - tracing. This function returns a match specification which - turns on sequential tracing with the given <c>Flags</c>. + tracing. This function returns a match specification, which + turns on sequential tracing with the specified <c>Flags</c>. </p> - <p>This match specification can be given as the last argument - to <c>tp</c> or <c>tpl</c>. The activated <c>Item</c> will - then become a <em>trigger</em> for sequential tracing. This - means that if the item is called on a process with the - <c>call</c> trace flag set, the process will be "contaminated" - with the seq_trace token. + <p>This match specification can be specified as the last argument + to <c>tp</c> or <c>tpl</c>. The activated <c>Item</c> + then becomes a <em>trigger</em> for sequential tracing. This + means that if the item is called on a process with trace flag + <c>call</c> set, the process is "contaminated" + with token <c>seq_trace</c>. </p> <p>If <c>Flags = all</c>, all possible flags are set. </p> - <p>Please turn to the reference manual for the - <em><c>seq_trace</c></em> module in the <em><c>kernel</c></em> - application to see the possible values for - <c>SeqTraceFlag</c>. For a description of the match_spec() - syntax, please turn to the <em>User's guide</em> for the - runtime system (<em>erts</em>). The chapter <em>Match Specification in Erlang</em> explains the general match - specification "language". + <p>The possible values for <c>SeqTraceFlag</c> are available in + <seealso marker="kernel:seq_trace"><c>seq_trace</c></seealso>.</p> + <p>For a description of the <c>match_spec()</c> syntax, + see section + <seealso marker="erts:match_spec"><c>Match Specifications in Erlang</c></seealso> + in <c>ERTS</c>, which explains the general match specification "language". </p> <note> <p>The <em>system tracer</em> for sequential tracing is automatically initiated by <c>ttb</c> when a trace port is - started with <c>ttb:tracer/0/1/2</c>.</p> + started with <c>ttb:tracer/0,1,2</c>.</p> </note> - <p>Example of how to use the <c>seq_trigger_ms/0/1</c> function:</p> - <code type="none"> -(tiger@durin)5> ttb:tracer(). + <p>An example of how to use function <c>seq_trigger_ms/0,1</c> follows:</p> + <pre> +(tiger@durin)5> <input>ttb:tracer().</input> {ok,[tiger@durin]} -(tiger@durin)6> ttb:p(all,call). +(tiger@durin)6> <input>ttb:p(all,call).</input> {ok,{[all],[call]}} -(tiger@durin)7> ttb:tp(mod,func,ttb:seq_trigger_ms()). +(tiger@durin)7> <input>ttb:tp(mod,func,ttb:seq_trigger_ms()).</input> {ok,[{matched,1},{saved,1}]} -(tiger@durin)8> </code> - <p>Whenever <c>mod:func(...)</c> is called after this, the - seq_trace token will be set on the executing process.</p> +(tiger@durin)8></pre> + <p>Whenever <c>mod:func(...)</c> is called after this, + token <c>seq_trace</c> is set on the executing process.</p> </desc> </func> + <func> <name>stop()</name> - <fsummary>Equivalent to stop([])</fsummary> + <fsummary>Equivalent to stop([]).</fsummary> <desc> <p>Equivalent to <c>stop([])</c>.</p> </desc> </func> + <func> <name>stop(Opts) -> stopped | {stopped, Dir}</name> - <fsummary>Stop tracing and fetch/format logs from all nodes</fsummary> + <fsummary>Stop tracing and fetch/format logs from all nodes.</fsummary> <type> <v>Opts = Opt | [Opt]</v> <v>Opt = nofetch | {fetch_dir, Dir} | format | {format, FormatOpts} | return_fetch_dir</v> @@ -486,88 +517,103 @@ ttb:p(all, call)</code> form <c>yyyymmdd-hhmmss</c>. Even logs from nodes on the same machine as the trace control node are moved to this directory. The history list is saved to a file named <c>ttb_last_config</c> - for further reference (as it will be not longer accessible - through history and configuration management functions (like + for further reference (as it is no longer accessible + through history and configuration management functions, like <c>ttb:list_history/0</c>). </p> - <p>The <c>nofetch</c> option indicates that trace logs shall not be - collected after tracing is stopped. - </p> - <p>The <c>{fetch, Dir}</c> option allows to specify the directory + <p><em>Options:</em></p> + <taglist> + <tag><c>nofetch</c></tag> + <item><p>Indicates that trace logs are not to be + collected after tracing is stopped.</p></item> + <tag><c>{fetch, Dir}</c></tag> + <item><p>Allows specification of the directory to fetch the data to. If the directory already exists, an - error is thrown. - </p> - <p>The <c>format</c> option indicates that the trace logs - shall be formatted after tracing is stopped. All logs in the fetch directory will be merged. - You may use <c>{format, FormatOpts}</c> to pass additional - arguments to <c>format/2</c>.</p> - <p>The <c>return_fetch_dir</c> option indicates that the return value - should be <c>{stopped, Dir}</c> and not just <c>stopped</c>. - This implies <c>fetch</c>. - </p> + error is thrown.</p></item> + <tag><c>format</c></tag> + <item><p>Indicates the trace logs to be formatted after tracing + is stopped. All logs in the fetch directory are merged.</p></item> + <tag><c>return_fetch_dir</c></tag> + <item><p>Indicates the return value + to be <c>{stopped, Dir}</c> and not just <c>stopped</c>. + This implies <c>fetch</c>.</p></item> + </taglist> + </desc> </func> + <func> <name>get_et_handler()</name> - <fsummary>Returns <c>et</c> handler.</fsummary> + <fsummary>Return the <c>et</c> handler.</fsummary> <desc> - <p>The <c>et</c> handler returned by the function may be used with <c>format/2</c> - or <c>tracer/2</c>. Example: <c>ttb:format(Dir, [{handler, ttb:get_et_handler()}])</c>.</p> + <p>Returns the <c>et</c> handler, which can be used with <c>format/2</c> + or <c>tracer/2</c>.</p> + <p>Example: <c>ttb:format(Dir, [{handler, ttb:get_et_handler()}])</c>.</p> </desc> </func> + <func> <name>format(File)</name> - <fsummary>Same as <c>format(File,[])</c>.</fsummary> + <fsummary>Equivalent to <c>format(File,[])</c>.</fsummary> <desc> - <p>Same as <c>format(File,[])</c>.</p> + <p>Equivalent to <c>format(File,[])</c>.</p> </desc> </func> + <func> <name>format(File,Options) -> ok | {error, Reason}</name> - <fsummary>Format a binary trace log</fsummary> + <fsummary>Format a binary trace log.</fsummary> <type> <v>File = string() | [string()]</v> - <d>This can be the name of a binary log, a list of such logs or the name of a directory containing one or more binary logs.</d> + <d>This can be the name of a binary log, a list of such logs, + or the name of a directory containing one or more binary logs.</d> <v>Options = Opt | [Opt]</v> <v>Opt = {out,Out} | {handler,FormatHandler} | disable_sort</v> <v>Out = standard_io | string()</v> <v>FormatHandler = {Function, InitialState}</v> <v>Function = fun(Fd,Trace,TraceInfo,State) -> State</v> <v>Fd = standard_io | FileDescriptor</v> - <d>This is the file descriptor of the destination file <c>Out</c></d> + <d>File descriptor of the destination file <c>Out</c>.</d> <v>Trace = tuple()</v> - <d>This is the trace message. Please turn to the Reference manual for the <c>erlang</c>module for details.</d> + <d>The trace message. For details, see the Reference Manual for + module <c>erlang</c>.</d> <v>TraceInfo = [{Key,ValueList}]</v> - <d>This includes the keys <c>flags</c>, <c>client</c> and <c>node</c>, and if <c>handler</c> is given as option to the tracer function, this is also included. In addition all information written with the <c>write_trace_info/2</c>function is included. </d> + <d>Includes the keys <c>flags</c>, <c>client</c>, and <c>node</c>. + If <c>handler</c> is specified as option to the tracer function, this + is also included. Also, all information written with function + <c>write_trace_info/2</c> is included.</d> </type> <desc> - <p>Reads the given binary trace log(s). The logs are processed - in the order of their timestamp as long as <c>disable_sort</c> - option is not given. + <p>Reads the specified binary trace log(s). The logs are processed + in the order of their time stamps as long as option <c>disable_sort</c> + is not specified. </p> <p>If <c>FormatHandler = {Function,InitialState}</c>, - <c>Function</c> will be called for each trace message. If - <c>FormatHandler = get_et_handler()</c>, <c>et_viewer</c> in - the <em>Event Tracer</em> application (<c>et</c>) is used for presenting + <c>Function</c> is called for each trace message.</p> + <p>If <c>FormatHandler = get_et_handler()</c>, <c>et_viewer</c> in + application ET is used for presenting the trace log graphically. <c>ttb</c> provides a few different - filters which can be selected from the Filter menu in the - <c>et_viewer</c>. If <c>FormatHandler</c> is not given, a - default handler is used which presents each trace message as a - line of text. + filters that can be selected from menu <em>Filters and scaling</em> + in the <c>et_viewer</c>.</p> + <p>If <c>FormatHandler</c> is not specified, a + default handler is used presenting each trace message as a + text line. </p> - <p>The state returned from each call of <c>Function</c> is passed to the next call, - even if next call is to format a message from another log file. + <p>The state returned from each call of <c>Function</c> is passed to + the next call, even if the next call is to format a message from another + log file. </p> - <p>If <c>Out</c> is given, <c>FormatHandler</c> gets the + <p>If <c>Out</c> is specified, <c>FormatHandler</c> gets the file descriptor to <c>Out</c> as the first parameter. </p> - <p><c>Out</c> is ignored if <c>et</c> format handler is used. + <p><c>Out</c> is ignored if the <c>et</c> format handler is used. </p> - <p>Wrap logs can be formatted one by one or all in one go. To - format one of the wrap logs in a set, give the exact name of - the file. To format the whole set of wrap logs, give the name - with '*' instead of the wrap count. See examples in the - <c>ttb</c> User's Guide.</p> + <p>Wrap logs can be formatted one by one or all at once. To + format one of the wrap logs in a set, specify the exact file name. + To format the whole set of wrap logs, specify the name + with <c>*</c> instead of the wrap count. For examples, see the + <seealso marker="ttb_ug#format"><c>User's Guide</c></seealso>. + </p> </desc> </func> </funcs> |