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erlang-doc-R13B-04.6.fc13.noarch.rpm

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<img alt="Erlang logo" src="../../../../doc/erlang-logo.png"><br><small><a href="users_guide.html">User's Guide</a><br><a href="index.html">Reference Manual</a><br><a href="release_notes.html">Release Notes</a><br><a href="../pdf/tools-2.6.5.1.pdf">PDF</a><br><a href="../../../../doc/index.html">Top</a></small><p><strong>Tools</strong><br><strong>Reference Manual</strong><br><small>Version 2.6.5.1</small></p>
<br><a href="javascript:openAllFlips()">Expand All</a><br><a href="javascript:closeAllFlips()">Contract All</a><p><small><strong>Table of Contents</strong></small></p>
<ul class="flipMenu">
<li id="no" title="cover " expanded="false">cover<ul>
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<li title="start-0"><a href="cover.html#start-0">start/0</a></li>
<li title="start-1"><a href="cover.html#start-1">start/1</a></li>
<li title="compile-1"><a href="cover.html#compile-1">compile/1</a></li>
<li title="compile-2"><a href="cover.html#compile-2">compile/2</a></li>
<li title="compile_module-1"><a href="cover.html#compile_module-1">compile_module/1</a></li>
<li title="compile_module-2"><a href="cover.html#compile_module-2">compile_module/2</a></li>
<li title="compile_directory-0"><a href="cover.html#compile_directory-0">compile_directory/0</a></li>
<li title="compile_directory-1"><a href="cover.html#compile_directory-1">compile_directory/1</a></li>
<li title="compile_directory-2"><a href="cover.html#compile_directory-2">compile_directory/2</a></li>
<li title="compile_beam-1"><a href="cover.html#compile_beam-1">compile_beam/1</a></li>
<li title="compile_beam_directory-0"><a href="cover.html#compile_beam_directory-0">compile_beam_directory/0</a></li>
<li title="compile_beam_directory-1"><a href="cover.html#compile_beam_directory-1">compile_beam_directory/1</a></li>
<li title="analyse-1"><a href="cover.html#analyse-1">analyse/1</a></li>
<li title="analyse-2"><a href="cover.html#analyse-2">analyse/2</a></li>
<li title="analyse-2"><a href="cover.html#analyse-2">analyse/2</a></li>
<li title="analyse-3"><a href="cover.html#analyse-3">analyse/3</a></li>
<li title="analyse_to_file-1"><a href="cover.html#analyse_to_file-1">analyse_to_file/1</a></li>
<li title="analyse_to_file-2"><a href="cover.html#analyse_to_file-2">analyse_to_file/2</a></li>
<li title="analyse_to_file-2"><a href="cover.html#analyse_to_file-2">analyse_to_file/2</a></li>
<li title="analyse_to_file-3"><a href="cover.html#analyse_to_file-3">analyse_to_file/3</a></li>
<li title="modules-0"><a href="cover.html#modules-0">modules/0</a></li>
<li title="imported_modules-0"><a href="cover.html#imported_modules-0">imported_modules/0</a></li>
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<li title="export-2"><a href="cover.html#export-2">export/2</a></li>
<li title="import-1"><a href="cover.html#import-1">import/1</a></li>
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</ul>
</li>
<li id="no" title="cprof " expanded="false">cprof<ul>
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<li title="analyse-0"><a href="cprof.html#analyse-0">analyse/0</a></li>
<li title="analyse-1"><a href="cprof.html#analyse-1">analyse/1</a></li>
<li title="analyse-1"><a href="cprof.html#analyse-1">analyse/1</a></li>
<li title="analyse-2"><a href="cprof.html#analyse-2">analyse/2</a></li>
<li title="pause-0"><a href="cprof.html#pause-0">pause/0</a></li>
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<li title="restart-0"><a href="cprof.html#restart-0">restart/0</a></li>
<li title="restart-1"><a href="cprof.html#restart-1">restart/1</a></li>
<li title="restart-2"><a href="cprof.html#restart-2">restart/2</a></li>
<li title="restart-3"><a href="cprof.html#restart-3">restart/3</a></li>
<li title="start-0"><a href="cprof.html#start-0">start/0</a></li>
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<li title="analyse-0"><a href="eprof.html#analyse-0">analyse/0</a></li>
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<li title="log-1"><a href="eprof.html#log-1">log/1</a></li>
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</ul>
</li>
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<li id="no" title="fprof " expanded="false">fprof<ul>
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<li title="start-0"><a href="fprof.html#start-0">start/0</a></li>
<li title="stop-0"><a href="fprof.html#stop-0">stop/0</a></li>
<li title="stop-1"><a href="fprof.html#stop-1">stop/1</a></li>
<li title="apply-2"><a href="fprof.html#apply-2">apply/2</a></li>
<li title="apply-3"><a href="fprof.html#apply-3">apply/3</a></li>
<li title="apply-3"><a href="fprof.html#apply-3">apply/3</a></li>
<li title="apply-4"><a href="fprof.html#apply-4">apply/4</a></li>
<li title="trace-2"><a href="fprof.html#trace-2">trace/2</a></li>
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<li title="trace-1"><a href="fprof.html#trace-1">trace/1</a></li>
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<li title="trace-1"><a href="fprof.html#trace-1">trace/1</a></li>
<li title="profile-0"><a href="fprof.html#profile-0">profile/0</a></li>
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<li title="profile-1"><a href="fprof.html#profile-1">profile/1</a></li>
<li title="profile-1"><a href="fprof.html#profile-1">profile/1</a></li>
<li title="profile-1"><a href="fprof.html#profile-1">profile/1</a></li>
<li title="analyse-0"><a href="fprof.html#analyse-0">analyse/0</a></li>
<li title="analyse-2"><a href="fprof.html#analyse-2">analyse/2</a></li>
<li title="analyse-1"><a href="fprof.html#analyse-1">analyse/1</a></li>
<li title="analyse-1"><a href="fprof.html#analyse-1">analyse/1</a></li>
<li title="analyse-1"><a href="fprof.html#analyse-1">analyse/1</a></li>
</ul>
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<li id="no" title="instrument " expanded="false">instrument<ul>
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<li title="allocator_descr-2"><a href="instrument.html#allocator_descr-2">allocator_descr/2</a></li>
<li title="block_header_size-1"><a href="instrument.html#block_header_size-1">block_header_size/1</a></li>
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<li title="holes-1"><a href="instrument.html#holes-1">holes/1</a></li>
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<li title="memory_data-0"><a href="instrument.html#memory_data-0">memory_data/0</a></li>
<li title="memory_status-1"><a href="instrument.html#memory_status-1">memory_status/1</a></li>
<li title="read_memory_data-1"><a href="instrument.html#read_memory_data-1">read_memory_data/1</a></li>
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<li title="sort-1"><a href="instrument.html#sort-1">sort/1</a></li>
<li title="store_memory_data-1"><a href="instrument.html#store_memory_data-1">store_memory_data/1</a></li>
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<li title="type_no_range-1"><a href="instrument.html#type_no_range-1">type_no_range/1</a></li>
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<li id="no" title="lcnt " expanded="false">lcnt<ul>
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<li title="collect-0"><a href="lcnt.html#collect-0">collect/0</a></li>
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<li title="clear-0"><a href="lcnt.html#clear-0">clear/0</a></li>
<li title="clear-1"><a href="lcnt.html#clear-1">clear/1</a></li>
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<li title="information-0"><a href="lcnt.html#information-0">information/0</a></li>
<li title="swap_pid_keys-0"><a href="lcnt.html#swap_pid_keys-0">swap_pid_keys/0</a></li>
<li title="load-1"><a href="lcnt.html#load-1">load/1</a></li>
<li title="save-1"><a href="lcnt.html#save-1">save/1</a></li>
<li title="apply-1"><a href="lcnt.html#apply-1">apply/1</a></li>
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<li title="apply-3"><a href="lcnt.html#apply-3">apply/3</a></li>
<li title="pid-2"><a href="lcnt.html#pid-2">pid/2</a></li>
<li title="pid-3"><a href="lcnt.html#pid-3">pid/3</a></li>
<li title="port-1"><a href="lcnt.html#port-1">port/1</a></li>
<li title="port-2"><a href="lcnt.html#port-2">port/2</a></li>
<li title="rt_collect-0"><a href="lcnt.html#rt_collect-0">rt_collect/0</a></li>
<li title="rt_collect-1"><a href="lcnt.html#rt_collect-1">rt_collect/1</a></li>
<li title="rt_clear-0"><a href="lcnt.html#rt_clear-0">rt_clear/0</a></li>
<li title="rt_clear-1"><a href="lcnt.html#rt_clear-1">rt_clear/1</a></li>
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<li title="rt_opt-2"><a href="lcnt.html#rt_opt-2">rt_opt/2</a></li>
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<li title="files-1"><a href="make.html#files-1">files/1</a></li>
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<li title="add_application-2"><a href="xref.html#add_application-2">add_application/2</a></li>
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<li title="add_module-2"><a href="xref.html#add_module-2">add_module/2</a></li>
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<li title="analyze-2"><a href="xref.html#analyze-2">analyze/2</a></li>
<li title="d-1"><a href="xref.html#d-1">d/1</a></li>
<li title="forget-1"><a href="xref.html#forget-1">forget/1</a></li>
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<li title="get_default-2"><a href="xref.html#get_default-2">get_default/2</a></li>
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<div id="content">
<div class="innertube">
<!-- refpage --><center><h1>eprof</h1></center>
  
  <h3>MODULE</h3>
<div class="REFBODY">eprof</div>
  <h3>MODULE SUMMARY</h3>
<div class="REFBODY">A Time Profiling Tool for Erlang</div>
  <h3>DESCRIPTION</h3>
<div class="REFBODY"><p>
    <p>The module <span class="code">eprof</span> provides a set of functions for time
      profiling of Erlang programs to find out how the execution time is
      used. The profiling is done using the Erlang trace BIFs. Tracing of
      local function calls for a specified set of processes is enabled when
      profiling is begun, and disabled when profiling is stopped.</p>
    <p>When using Eprof, expect a significant slowdown in program execution,
      in most cases at least 100 percent.</p>
  </p></div>
  <h3>EXPORTS</h3>
    <p><a name="start-0"><span class="bold_code">start() -&gt; {ok,Pid} | {error,Reason}</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
        <div class="REFTYPES">
<span class="bold_code">Pid = pid()</span><br>
</div>
        <div class="REFTYPES">
<span class="bold_code">Reason = {already_started,Pid}</span><br>
</div>
      </div>
<div class="REFBODY"><p>
        <p>Starts the Eprof server which owns the Eprof internal database.</p>
      </p></div>
    <p><a name="start_profiling-1"><span class="bold_code">start_profiling(Rootset) -&gt; profiling | error</span></a><br><a name="profile-1"><span class="bold_code">profile(Rootset) -&gt; profiling | error</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
        <div class="REFTYPES">
<span class="bold_code">Rootset = [atom() | pid()]</span><br>
</div>
      </div>
<div class="REFBODY"><p>
        <p>Starts profiling for the processes in <span class="code">Rootset</span> (and any new
          processes spawned from them). Information about activity in any
          profiled process is stored in the Eprof database.</p>
        <p><span class="code">Rootset</span> is a list of pids and registered names.</p>
        <p>The function returns <span class="code">profiling</span> if tracing could be enabled
          for all processes in <span class="code">Rootset</span>, or <span class="code">error</span> otherwise.</p>
      </p></div>
    <p><a name="stop_profiling-0"><span class="bold_code">stop_profiling() -&gt; profiling_stopped | profiling_already_stopped</span></a><br></p>
<div class="REFBODY"><p>
        <p>Stops profiling started with <span class="code">start_profiling/1</span> or
          <span class="code">profile/1</span>.</p>
      </p></div>
    <p><a name="profile-2"><span class="bold_code">profile(Rootset,Fun) -&gt; {ok,Value} | {error,Reason} | error</span></a><br><a name="profile-4"><span class="bold_code">profile(Rootset,Module,Function,Args) -&gt; {ok,Value} | {error,Reason} | error</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
        <div class="REFTYPES">
<span class="bold_code">Rootset = [atom() | pid()]</span><br>
</div>
        <div class="REFTYPES">
<span class="bold_code">Fun = fun() -&gt; term()</span><br>
</div>
        <div class="REFTYPES">
<span class="bold_code">Module = Function = atom()</span><br>
</div>
        <div class="REFTYPES">
<span class="bold_code">Args = [term()]</span><br>
</div>
        <div class="REFTYPES">
<span class="bold_code">Value = Reason = term()</span><br>
</div>
      </div>
<div class="REFBODY"><p>
        <p>This function first spawns a process <span class="code">P</span> which evaluates
          <span class="code">Fun()</span> or <span class="code">apply(Module,Function,Args)</span>. Then, it
          starts profiling for <span class="code">P</span> and the processes in <span class="code">Rootset</span>
          (and any new processes spawned from them). Information about
          activity in any profiled process is stored in the Eprof database.</p>
        <p><span class="code">Rootset</span> is a list of pids and registered names.</p>
        <p>If tracing could be enabled for <span class="code">P</span> and all processes in
          <span class="code">Rootset</span>, the function returns <span class="code">{ok,Value}</span> when
          <span class="code">Fun()</span>/<span class="code">apply</span> returns with the value <span class="code">Value</span>, or
          <span class="code">{error,Reason}</span> if <span class="code">Fun()</span>/<span class="code">apply</span> fails with
          exit reason <span class="code">Reason</span>. Otherwise it returns <span class="code">error</span>
          immediately.</p>
        <p>The programmer must ensure that the function given as argument
          is truly synchronous and that no work continues after
          the function has returned a value.</p>
      </p></div>
    <p><a name="analyse-0"><span class="bold_code">analyse()</span></a><br></p>
<div class="REFBODY"><p>
        <p>Call this function when profiling has been stopped to display
          the results per process, that is:</p>
        <ul>
          <li>how much time has been used by each process, and</li>
          <li>in which function calls this time has been spent.</li>
        </ul>
        <p>Time is shown as percentage of total time, not as absolute time.</p>
      </p></div>
    <p><a name="total_analyse-0"><span class="bold_code">total_analyse()</span></a><br></p>
<div class="REFBODY"><p>
        <p>Call this function when profiling has been stopped to display
          the results per function call, that is in which function calls
          the time has been spent.</p>
        <p>Time is shown as percentage of total time, not as absolute time.</p>
      </p></div>
    <p><a name="log-1"><span class="bold_code">log(File) -&gt; ok</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
        <div class="REFTYPES">
<span class="bold_code">File = atom() | string()</span><br>
</div>
      </div>
<div class="REFBODY"><p>
        <p>This function ensures that the results displayed by
          <span class="code">analyse/0</span> and <span class="code">total_analyse/0</span> are printed both to
          the file <span class="code">File</span> and the screen.</p>
      </p></div>
    <p><a name="stop-0"><span class="bold_code">stop() -&gt; stopped</span></a><br></p>
<div class="REFBODY"><p>
        <p>Stops the Eprof server.</p>
      </p></div>
  
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