diff options
Diffstat (limited to 'erts/doc/src/erlang.xml')
| -rw-r--r-- | erts/doc/src/erlang.xml | 55 |
1 files changed, 47 insertions, 8 deletions
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml index 7ff52c5b50..3c64fe2bef 100644 --- a/erts/doc/src/erlang.xml +++ b/erts/doc/src/erlang.xml @@ -407,7 +407,7 @@ iolist() = [char() | binary() | iolist()] </desc> </func> <func> - <name>erlang:binary_to_term(Binary, Opts) -> term()</name> + <name>binary_to_term(Binary, Opts) -> term()</name> <fsummary>Decode an Erlang external term format binary</fsummary> <type> <v>Opts = [safe]</v> @@ -5187,10 +5187,21 @@ true</pre> For more information on how to define the CPU topology, see <seealso marker="#system_flag_cpu_topology">erlang:system_flag(cpu_topology, CpuTopology)</seealso>. </p> - <p><em>NOTE:</em> If other programs on the system have bound - to processors, e.g. another Erlang runtime system, you - may lose performance when binding schedulers. Therefore, - schedulers are by default not bound.</p> + <p>The runtime system will by default bind schedulers to logical + processors using the <c>default_bind</c> bind type if the amount + of schedulers are at least equal to the amount of logical + processors configured, binding of schedulers is supported, + and a CPU topology is available at startup. + </p> + <p><em>NOTE:</em> If the Erlang runtime system is the only + operating system process that binds threads to logical processors, + this improves the performance of the runtime system. However, + if other operating system processes (as for example another Erlang + runtime system) also bind threads to logical processors, there + might be a performance penalty instead. If this is the case you, + are are advised to unbind the schedulers using the + <seealso marker="erl#+sbt">+sbtu</seealso> command line argument, + or <c>erlang:system_flag(scheduler_bind_type, unbound)</c>.</p> <p>Schedulers can be bound in different ways. The <c>How</c> argument determines how schedulers are bound. <c>How</c> can currently be one of:</p> @@ -6743,6 +6754,17 @@ true</pre> See also <seealso marker="#trace_pattern/3">erlang:trace_pattern/3</seealso>.</p> </item> + <tag><c>call_time</c></tag> + <item> + <p>Return the call time values for this function or + <c>true</c> for the pseudo function <c>on_load</c> if call + time tracing is active. Returns <c>false</c> otherwise. + The call time values returned, <c>[{Pid, Count, S, Us}]</c>, + is a list of each process that has executed the function and its specific counters. + See also + <seealso marker="#trace_pattern/3">erlang:trace_pattern/3</seealso>.</p> + </item> + <tag><c>all</c></tag> <item> <p>Return a list containing the <c>{Item, Value}</c> tuples @@ -6845,13 +6867,13 @@ true</pre> </item> <tag><c>restart</c></tag> <item> - <p>For the <c>FlagList</c> option <c>call_count</c>: + <p>For the <c>FlagList</c> option <c>call_count</c> and <c>call_time</c>: restart the existing counters. The behaviour is undefined for other <c>FlagList</c> options.</p> </item> <tag><c>pause</c></tag> <item> - <p>For the <c>FlagList</c> option <c>call_count</c>: pause + <p>For the <c>FlagList</c> option <c>call_count</c> and <c>call_time</c>: pause the existing counters. The behaviour is undefined for other <c>FlagList</c> options.</p> </item> @@ -6906,6 +6928,23 @@ true</pre> <p>The counter value can be read with <seealso marker="#trace_info/2">erlang:trace_info/2</seealso>.</p> </item> + <tag><c>call_time</c></tag> + <item> + <p>Starts (<c>MatchSpec == true</c>) or stops + (<c>MatchSpec == false</c>) call time tracing for all + types of function calls. For every function a counter is + incremented when the function is called. Time spent in the function + is accumulated in two other counters, seconds and micro-seconds. + The counters are stored for each call traced process.</p> + <p>If call time tracing is started while already running, + the count and time is restarted from zero. Running counters can be + paused with <c>MatchSpec == pause</c>. Paused and running + counters can be restarted from zero with + <c>MatchSpec == restart</c>.</p> + <p>The counter value can be read with + <seealso marker="#trace_info/2">erlang:trace_info/2</seealso>.</p> + </item> + </taglist> <p>The <c>global</c> and <c>local</c> options are mutually exclusive and <c>global</c> is the default (if no options are @@ -6913,7 +6952,7 @@ true</pre> perform a kind of local tracing, and can also not be combined with <c>global</c>. A function can be either globally or locally traced. If global tracing is specified for a - specified set of functions; local, meta and call count + specified set of functions; local, meta, call time and call count tracing for the matching set of local functions will be disabled, and vice versa.</p> <p>When disabling trace, the option must match the type of trace |