path: root/doc/man/scons-time.xml

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<!-- lifted from troff+man by doclifter -->
<refentry id='sconstime1'
          xmlns="http://www.scons.org/dbxsd/v1.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://www.scons.org/dbxsd/v1.0 http://www.scons.org/dbxsd/v1.0/scons.xsd">
<refmeta>
<refentrytitle>SCONS-TIME</refentrytitle>
<manvolnum>1</manvolnum>
<refmiscinfo class='source'>SCons 3.1.2</refmiscinfo>
<refmiscinfo class='manual'>SCons 3.1.2</refmiscinfo>
</refmeta>
<refnamediv id='name'>
<refname>scons-time</refname>
<refpurpose>generate and display SCons timing information</refpurpose>
</refnamediv>
<refsynopsisdiv id='synopsis'>
<cmdsynopsis>
  <command>scons-time</command>    
    <arg choice='plain'><replaceable>subcommand</replaceable></arg>
    <arg choice='opt' rep='repeat'><replaceable>options</replaceable></arg>
    <arg choice='opt' rep='repeat'><replaceable>arguments</replaceable></arg>
</cmdsynopsis>
</refsynopsisdiv>

<!-- body begins here -->

<refsect1 id='generating_timing_information'><title>Generating Timing Information</title>
<para><emphasis role="bold">scons-time run</emphasis>
[<option>-hnqv</option>]
[<option>-f </option><emphasis>FILE</emphasis>]
[<option>--number=</option><replaceable>NUMBER</replaceable>]
[<option>--outdir=</option><replaceable>OUTDIR</replaceable>]
[<option>-p </option><emphasis>STRING</emphasis>]
[<option>--python=</option><replaceable>PYTHON</replaceable>]
[<option>-s </option><emphasis>DIR</emphasis>]
[<option>--scons=</option><replaceable>SCONS</replaceable>]
[<option>--svn=</option><replaceable>URL</replaceable>]
[<emphasis>ARGUMENTS</emphasis>]</para>
<!-- '\"\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- -->

<refsect2 id='extracting_function_timings'><title>Extracting Function Timings</title>
<para><emphasis role="bold">scons-time func</emphasis>
[<option>-h</option>]
[<option>--chdir=</option><replaceable>DIR</replaceable>]
[<option>-f </option><emphasis>FILE</emphasis>]
[<option>--fmt=</option><replaceable>FORMAT</replaceable>]
[<option>--func=</option><replaceable>NAME</replaceable>]
[<option>-p </option><emphasis>STRING</emphasis>]
[<option>-t </option><emphasis>NUMBER</emphasis>]
[<option>--title= TITLE</option>]
[<emphasis>ARGUMENTS</emphasis>]</para>
<!-- '\"\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- -->
</refsect2>

<refsect2 id='extracting_memory_statistics'><title>Extracting Memory Statistics</title>
<para><emphasis role="bold">scons-time mem</emphasis>
[<option>-h</option>]
[<option>--chdir=</option><replaceable>DIR</replaceable>]
[<option>-f </option><emphasis>FILE</emphasis>]
[<option>--fmt=</option><replaceable>FORMAT</replaceable>]
[<option>-p </option><emphasis>STRING</emphasis>]
[<option>--stage=</option><replaceable>STAGE</replaceable>]
[<option>-t </option><emphasis>NUMBER</emphasis>]
[<option>--title=</option><replaceable>TITLE</replaceable>]
[<emphasis>ARGUMENTS</emphasis>]</para>
<!-- '\"\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- -->
</refsect2>

<refsect2 id='extracting_object_counts'><title>Extracting Object Counts</title>
<para><emphasis role="bold">scons-time obj</emphasis>
[<option>-h</option>]
[<option>--chdir=</option><replaceable>DIR</replaceable>]
[<option>-f </option><emphasis>FILE</emphasis>]
[<option>--fmt=</option><replaceable>FORMAT</replaceable>]
[<option>-p </option><emphasis>STRING</emphasis>]
[<option>--stage=</option><replaceable>STAGE</replaceable>]
[<option>-t </option><emphasis>NUMBER</emphasis>]
[<option>--title=</option><replaceable>TITLE</replaceable>]
[<emphasis>ARGUMENTS</emphasis>]</para>
<!-- '\"\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- -->
</refsect2>

<refsect2 id='extracting_execution_times'><title>Extracting Execution Times</title>
<para><emphasis role="bold">scons-time time</emphasis>
[<option>-h</option>]
[<option>--chdir=</option><replaceable>DIR</replaceable>]
[<option>-f </option><emphasis>FILE</emphasis>]
[<option>--fmt=</option><replaceable>FORMAT</replaceable>]
[<option>-p </option><emphasis>STRING</emphasis>]
[<option>-t </option><emphasis>NUMBER</emphasis>]
[<option>--title=</option><replaceable>TITLE</replaceable>]
[<option>--which=</option><replaceable>WHICH</replaceable>]
[<emphasis>ARGUMENTS</emphasis>]</para>
<!-- '\"\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- -->
</refsect2>

<refsect2 id='help_text'><title>Help Text</title>
<para><emphasis role="bold">scons-time help</emphasis>
<emphasis>SUBCOMMAND</emphasis>
[...]</para>
<!-- '\"========================================================================== -->
</refsect2>
</refsect1>

<refsect1 id='description'><title>DESCRIPTION</title>
<para>The 
<command>scons-time</command>
command runs an SCons configuration
through a standard set of profiled timings
and can extract and graph information from the
resulting profiles and log files of those timings.
The action to be performed by the
<command>scons-time</command>
script is specified
by a subcommand, the first argument on the command line.
See the
<link linkend="subcommands">SUBCOMMANDS</link>
section below for information about the operation
of specific subcommands.</para>

<para>The basic way to use
<command>scons-time</command>
is to run the
<emphasis role="bold">scons-time run</emphasis>
subcommand
(possibly multiple times)
to generate profile and log file output,
and then use one of the other
subcommands to display the results
captured in the profiles and log files
for a particular kind of information:
function timings
(the
<emphasis role="bold">scons-time func</emphasis>
subcommand),
total memory used
(the
<emphasis role="bold">scons-time mem</emphasis>
subcommand),
object counts
(the
<emphasis role="bold">scons-time obj</emphasis>
subcommand)
and overall execution time
(the
<emphasis role="bold">scons-time time</emphasis>
subcommand).
Options exist to place and find the
profiles and log files in separate directories,
to generate the output in a format suitable
for graphing with the
<citerefentry><refentrytitle>gnuplot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
program,
and so on.</para>

<para>There are two basic ways the
<emphasis role="bold">scons-time run</emphasis>
subcommand
is intended to be used
to gather timing statistics
for a configuration.
One is to use the
<option>--svn=</option>
option to test a configuration against
a list of revisions from the SCons Subversion repository.
This will generate a profile and timing log file
for every revision listed with the
<option>--number=</option>
option,
and can be used to look at the
impact of committed changes to the
SCons code base on a particular
configuration over time.</para>

<para>The other way is to profile incremental changes to a
local SCons code base during a development cycle--that is,
to look at the performance impact of changes
you're making in the local tree.
In this mode,
you run the
<emphasis role="bold">scons-time run</emphasis>
subcommand
<emphasis>without</emphasis>
the
<option>--svn=</option>
option,
in which case it simply looks in the profile/log file output directory
(the current directory by default)
and automatically figures out the
<emphasis>next</emphasis>
run number for the output profile and log file.
Used in this way,
the development cycle goes something like:
make a change to SCons;
run
<emphasis role="bold">scons-time run</emphasis>
to profile it against a specific configuration;
make another change to SCons;
run
<emphasis role="bold">scons-time run</emphasis>
again to profile it;
etc.</para>
<!-- '\"========================================================================== -->
</refsect1>

<refsect1 id='options'><title>OPTIONS</title>
<para>The
<command>scons-time</command>
command only supports a few global options:</para>
<variablelist>
  <varlistentry>
  <term>-h, --help</term>
  <listitem>
<para>Displays the global help text and exits,
identical to the
<emphasis role="bold">scons-time help</emphasis>
subcommand.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>-V, --version</term>
  <listitem>
<para>Displays the
<command>scons-time</command>
version and exits.</para>
  </listitem>
  </varlistentry>
</variablelist>

<para>Most functionality is controlled by options
to the individual subcommands.
See the next section for information
about individual subcommand options.</para>
<!-- '\"========================================================================== -->
</refsect1>

<refsect1 id='subcommands'><title>SUBCOMMANDS</title>
<para>The
<command>scons-time</command>
command supports the following
individual subcommands.</para>
<!-- '\"\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- -->

<refsect2 id='the_func_subcommand'><title>The func Subcommand</title>
<para><emphasis role="bold">scons-time func</emphasis>
[<option>-h</option>]
[<option>--chdir=</option><replaceable>DIR</replaceable>]
[<option>-f </option><emphasis>FILE</emphasis>]
[<option>--fmt=</option><replaceable>FORMAT</replaceable>]
[<option>--func=</option><replaceable>NAME</replaceable>]
[<option>-p </option><emphasis>STRING</emphasis>]
[<option>-t </option><emphasis>NUMBER</emphasis>]
[<option>--title= TITLE</option>]
[<emphasis>ARGUMENTS</emphasis>]</para>

<para>The
<emphasis role="bold">scons-time func</emphasis>
subcommand displays timing information
for a specific Python function within SCons.
By default, it extracts information about the
<emphasis role="bold">_main</emphasis>()
function,
which includes the Python profiler timing
for all of SCons.</para>

<para>The
<emphasis role="bold">scons-time func</emphasis>
subcommand extracts function timing information
from all the specified file arguments,
which should be Python profiler output files.
(Normally, these would be
<emphasis role="bold">*.prof</emphasis>
files generated by the
<emphasis role="bold">scons-time run</emphasis>
subcommand,
but they can actually be generated
by any Python profiler invocation.)
All file name arguments will be
globbed for on-disk files.</para>

<para>If no arguments are specified,
then function timing information
will be extracted from all
<emphasis role="bold">*.prof</emphasis>
files,
or the subset of them
with a prefix specified by the
<option>-p</option>
option.</para>

<para>Options include:</para>
<variablelist>
  <varlistentry>
  <term>-C DIRECTORY, --chdir=DIRECTORY</term>
  <listitem>
<para>Changes to the specified
<emphasis>DIRECTORY</emphasis>
before looking for the specified files
(or files that match the specified patterns).</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>-f FILE, --file=FILE</term>
  <listitem>
<para>Reads configuration information from the specified
<emphasis>FILE</emphasis>.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>-fmt=FORMAT, --format=FORMAT</term>
  <listitem>
<para>Reports the output in the specified
<emphasis>FORMAT</emphasis>.
The formats currently supported are
<emphasis role="bold">ascii</emphasis>
(the default)
and
<emphasis role="bold">gnuplot</emphasis>.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>--func=NAME</term>
  <listitem>
<para>Extracts timings for the specified function
<emphasis>NAME</emphasis>.
The default is to report cumulative timings for the
<emphasis role="bold">_main</emphasis>()
function,
which contains the entire SCons run.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>-h, --help</term>
  <listitem>
<para>Displays help text for the
<emphasis role="bold">scons-time func</emphasis>
subcommand.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>-p STRING, --prefix=STRING</term>
  <listitem>
<para>Specifies the prefix string for profiles
from which to extract function timing information.
This will be used to search for profiles
if no arguments are specified on the command line.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>-t NUMBER, --tail=NUMBER</term>
  <listitem>
<para>Only extracts function timings from the last
<emphasis>NUMBER</emphasis>
files.</para>
<!-- '\"\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- -->
  </listitem>
  </varlistentry>
</variablelist>
</refsect2>

<refsect2 id='the_help_subcommand'><title>The help Subcommand</title>
<para><emphasis role="bold">scons-time help</emphasis>
<emphasis>SUBCOMMAND</emphasis>
[...]
The
<emphasis role="bold">help</emphasis>
subcommand prints help text for any
other subcommands listed as later arguments on the command line.</para>
<!-- '\"\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- -->
</refsect2>

<refsect2 id='the_mem_subcommand'><title>The mem Subcommand</title>
<para><emphasis role="bold">scons-time mem</emphasis>
[<option>-h</option>]
[<option>--chdir=</option><replaceable>DIR</replaceable>]
[<option>-f </option><emphasis>FILE</emphasis>]
[<option>--fmt=</option><replaceable>FORMAT</replaceable>]
[<option>-p </option><emphasis>STRING</emphasis>]
[<option>--stage=</option><replaceable>STAGE</replaceable>]
[<option>-t </option><emphasis>NUMBER</emphasis>]
[<option>--title=</option><replaceable>TITLE</replaceable>]
[<emphasis>ARGUMENTS</emphasis>]</para>

<para>The
<emphasis role="bold">scons-time mem</emphasis>
subcommand displays how much memory SCons uses.</para>

<para>The
<emphasis role="bold">scons-time mem</emphasis>
subcommand extracts memory use information
from all the specified file arguments,
which should be files containing output from
running SCons with the
<option>--debug=memory</option>
option.
(Normally, these would be
<emphasis role="bold">*.log</emphasis>
files generated by the
<emphasis role="bold">scons-time run</emphasis>
subcommand.)
All file name arguments will be
globbed for on-disk files.</para>

<para>If no arguments are specified,
then memory information
will be extracted from all
<emphasis role="bold">*.log</emphasis>
files,
or the subset of them
with a prefix specified by the
<option>-p</option>
option.</para>

<variablelist>
  <varlistentry>
  <term>-C DIR, --chdir=DIR</term>
  <listitem>
<para>Changes to the specified
<emphasis>DIRECTORY</emphasis>
before looking for the specified files
(or files that match the specified patterns).</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>-f FILE, --file=FILE</term>
  <listitem>
<para>Reads configuration information from the specified
<emphasis>FILE</emphasis>.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>-fmt=FORMAT, --format=FORMAT</term>
  <listitem>
<para>Reports the output in the specified
<emphasis>FORMAT</emphasis>.
The formats currently supported are
<emphasis role="bold">ascii</emphasis>
(the default)
and
<emphasis role="bold">gnuplot</emphasis>.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>-h, --help</term>
  <listitem>
<para>Displays help text for the
<emphasis role="bold">scons-time mem</emphasis>
subcommand.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>-p STRING, --prefix=STRING</term>
  <listitem>
<para>Specifies the prefix string for log files
from which to extract memory usage information.
This will be used to search for log files
if no arguments are specified on the command line.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>--stage=STAGE</term>
  <listitem>
<para>Prints the memory used at the end of the specified
<emphasis>STAGE</emphasis>:
<emphasis role="bold">pre-read</emphasis>
(before the SConscript files are read),
<emphasis role="bold">post-read ,</emphasis>
(after the SConscript files are read),
<emphasis role="bold">pre-build</emphasis>
(before any targets are built)
or
<emphasis role="bold">post-build</emphasis>
(after any targets are built).
If no
<option>--stage</option>
option is specified,
the default behavior is
<emphasis role="bold">post-build</emphasis>,
which reports the final amount of memory
used by SCons during each run.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>-t NUMBER, --tail=NUMBER</term>
  <listitem>
<para>Only reports memory statistics from the last
<emphasis>NUMBER</emphasis>
files.</para>
<!-- '\"\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- -->
  </listitem>
  </varlistentry>
</variablelist>
</refsect2>

<refsect2 id='the_obj_subcommand'><title>The obj Subcommand</title>
<para><emphasis role="bold">scons-time obj</emphasis>
[<option>-h</option>]
[<option>--chdir=</option><replaceable>DIR</replaceable>]
[<option>-f </option><emphasis>FILE</emphasis>]
[<option>--fmt=</option><replaceable>FORMAT</replaceable>]
[<option>-p </option><emphasis>STRING</emphasis>]
[<option>--stage=</option><replaceable>STAGE</replaceable>]
[<option>-t </option><emphasis>NUMBER</emphasis>]
[<option>--title=</option><replaceable>TITLE</replaceable>]
[<emphasis>ARGUMENTS</emphasis>]</para>

<para>The
<emphasis role="bold">scons-time obj</emphasis>
subcommand displays how many objects of a specific named type
are created by SCons.</para>

<para>The
<emphasis role="bold">scons-time obj</emphasis>
subcommand extracts object counts
from all the specified file arguments,
which should be files containing output from
running SCons with the
<option>--debug=count</option>
option.
(Normally, these would be
<emphasis role="bold">*.log</emphasis>
files generated by the
<emphasis role="bold">scons-time run</emphasis>
subcommand.)
All file name arguments will be
globbed for on-disk files.</para>

<para>If no arguments are specified,
then object counts
will be extracted from all
<emphasis role="bold">*.log</emphasis>
files,
or the subset of them
with a prefix specified by the
<option>-p</option>
option.</para>
<variablelist>
  <varlistentry>
  <term>-C DIR, --chdir=DIR</term>
  <listitem>
<para>Changes to the specified
<emphasis>DIRECTORY</emphasis>
before looking for the specified files
(or files that match the specified patterns).</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>-f FILE, --file=FILE</term>
  <listitem>
<para>Reads configuration information from the specified
<emphasis>FILE</emphasis>.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>-fmt=FORMAT, --format=FORMAT</term>
  <listitem>
<para>Reports the output in the specified
<emphasis>FORMAT</emphasis>.
The formats currently supported are
<emphasis role="bold">ascii</emphasis>
(the default)
and
<emphasis role="bold">gnuplot</emphasis>.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>-h, --help</term>
  <listitem>
<para>Displays help text for the
<emphasis role="bold">scons-time obj</emphasis>
subcommand.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>-p STRING, --prefix=STRING</term>
  <listitem>
<para>Specifies the prefix string for log files
from which to extract object counts.
This will be used to search for log files
if no arguments are specified on the command line.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>--stage=STAGE</term>
  <listitem>
<para>Prints the object count at the end of the specified
<emphasis>STAGE</emphasis>:
<emphasis role="bold">pre-read</emphasis>
(before the SConscript files are read),
<emphasis role="bold">post-read ,</emphasis>
(after the SConscript files are read),
<emphasis role="bold">pre-build</emphasis>
(before any targets are built)
or
<emphasis role="bold">post-build</emphasis>
(after any targets are built).
If no
<option>--stage</option>
option is specified,
the default behavior is
<emphasis role="bold">post-build</emphasis>,
which reports the final object count during each run.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>-t NUMBER, --tail=NUMBER</term>
  <listitem>
<para>Only reports object counts from the last
<emphasis>NUMBER</emphasis>
files.</para>
<!-- '\"\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- -->
  </listitem>
  </varlistentry>
</variablelist>
</refsect2>

<refsect2 id='the_run_subcommand'><title>The run Subcommand</title>
<para><emphasis role="bold">scons-time run</emphasis>
[<option>-hnqv</option>]
[<option>-f </option><emphasis>FILE</emphasis>]
[<option>--number=</option><replaceable>NUMBER</replaceable>]
[<option>--outdir=</option><replaceable>OUTDIR</replaceable>]
[<option>-p </option><emphasis>STRING</emphasis>]
[<option>--python=</option><replaceable>PYTHON</replaceable>]
[<option>-s </option><emphasis>DIR</emphasis>]
[<option>--scons=</option><replaceable>SCONS</replaceable>]
[<option>--svn=</option><replaceable>URL</replaceable>]
[<emphasis>ARGUMENTS</emphasis>]
The
<emphasis role="bold">scons-time run</emphasis>
subcommand is the basic subcommand
for profiling a specific configuration
against a version of SCons.</para>

<para>The configuration to be tested
is specified as a list of files
or directories that will be unpacked or copied
into a temporary directory
in which SCons will be invoked.
The
<emphasis role="bold">scons-time run</emphasis>
subcommand understands file suffixes like
<markup>.tar</markup>,
<markup>.tar.gz</markup>,
<markup>.tgz</markup>
and
<markup>.zip</markup>
and will unpack their contents into a temporary directory.
If more than one argument is specified,
each one will be unpacked or copied
into the temporary directory "on top of"
the previous archives or directories,
so the expectation is that multiple
specified archives share the same directory layout.</para>

<para>Once the file or directory arguments are unpacked or
copied to the temporary directory,
the
<emphasis role="bold">scons-time run</emphasis>
subcommand runs the
requested version of SCons
against the configuration
three times:</para>
<variablelist>
  <varlistentry>
  <term>Startup</term>
  <listitem>
<para>SCons is run with the
<option>--help</option>
option so that just the SConscript files are read,
and then the default help text is printed.
This profiles just the perceived "overhead" of starting up SCons
and processing the SConscript files.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>Full build</term>
  <listitem>
<para>SCons is run to build everything specified in the configuration.
Specific targets to be passed in on the command l ine
may be specified by the
<emphasis role="bold">targets</emphasis>
keyword in a configuration file; see below for details.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>Rebuild</term>
  <listitem>
<para>SCons is run again on the same just-built directory.
If the dependencies in the SCons configuration are correct,
this should be an up-to-date, "do nothing" rebuild.</para>
  </listitem>
  </varlistentry>
</variablelist>

<para>Each invocation captures the output log file and a profile.</para>

<para>The
<emphasis role="bold">scons-time run</emphasis>
subcommand supports the following options:</para>
<variablelist>
  <varlistentry>
  <term>-f FILE, --file=FILE</term>
  <listitem>
<para>Reads configuration information from the specified
<emphasis>FILE</emphasis>.
This often provides a more convenient way to specify and
collect parameters associated with a specific timing configuration
than specifying them on the command line.
See the
<link linkend="configuration_file">CONFIGURATION FILE</link>
section below
for information about the configuration file parameters.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>-h, --help</term>
  <listitem>
<para>Displays help text for the
<emphasis role="bold">scons-time run</emphasis>
subcommand.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>-n, --no-exec</term>
  <listitem>
<para>Do not execute commands,
just printing the command-line equivalents of what would be executed.
Note that the
<command>scons-time</command>
script actually executes its actions in Python,
where possible,
for portability.
The commands displayed are UNIX
<emphasis>equivalents</emphasis>
of what it's doing.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>--number=NUMBER</term>
  <listitem>
<para>Specifies the run number to be used in the names of
the log files and profile outputs generated by this run.</para>
  </listitem>
  </varlistentry>
</variablelist>

<para>When used in conjunction with the
<option>--svn=</option><replaceable>URL</replaceable>
option,
<emphasis>NUMBER</emphasis>
specifies one or more comma-separated Subversion revision numbers
that will be retrieved automatically from the Subversion
repository at the specified
<emphasis>URL</emphasis>.
Ranges of delta or revision numbers
may be specified be separating two numbers
with a hyphen
(<emphasis role="bold">-</emphasis>).</para>

<para>Example:</para>
<literallayout class="monospaced">
% scons-time run --svn=<ulink url='http://scons.tigris.org/svn/trunk'>http://scons.tigris.org/svn/trunk</ulink> --num=1247,1249-1252 .
</literallayout> <!-- .fi -->
<variablelist>
  <varlistentry>
  <term>-p STRING, --prefix=STRING</term>
  <listitem>
<para>Specifies the prefix string to be used for all of the log files
and profiles generated by this run.
The default is derived from the first
specified argument:
if the first argument is a directory,
the default prefix is the name of the directory;
if the first argument is an archive
(tar or zip file),
the default prefix is the the base name of the archive,
that is, what remains after stripping the archive suffix
(<markup>.tgz</markup>, <markup>.tar.gz</markup> or <markup>.zip</markup>).</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>--python=PYTHON</term>
  <listitem>
<para>Specifies a path to the Python executable to be used
for the timing runs.
The default is to use the same Python executable that
is running the
<command>scons-time</command>
command itself.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>-q, --quiet</term>
  <listitem>
<para>Suppresses display of the command lines being executed.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>-s DIR, --subdir=DIR</term>
  <listitem>
<para>Specifies the name of directory or subdirectory
from which the commands should be executed.
The default is XXX</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>--scons=SCONS</term>
  <listitem>
<para>Specifies a path to the SCons script to be used
for the timing runs.
The default is XXX</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>--svn=URL, --subversion=URL</term>
  <listitem>
<para>Specifies the
<emphasis>URL</emphasis>
of the Subversion repository from which the
version(s) of
<emphasis role="bold">scons</emphasis>
being timed will be extracted.
When
<option>--svn</option>
is specified, the
<option>--number=</option><replaceable>NUMBER</replaceable>
option specifies revision numbers
that will be tested.
Output from each invocation run will be placed in file
names that match the Subversion revision numbers.
If the
<option>--number=</option>
option is not specified,
then the default behavior is to time the
<emphasis role="bold">HEAD</emphasis>
of the specified
<emphasis>URL</emphasis>.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>-v, --verbose</term>
  <listitem>
<para>Displays the output from individual commands to the screen
(in addition to capturing the output in log files).</para>
<!-- '\"\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- -->
  </listitem>
  </varlistentry>
</variablelist>
</refsect2>

<refsect2 id='the_time_subcommand'><title>The time Subcommand</title>
<para><emphasis role="bold">scons-time time</emphasis>
[<option>-h</option>]
[<option>--chdir=</option><replaceable>DIR</replaceable>]
[<option>-f </option><emphasis>FILE</emphasis>]
[<option>--fmt=</option><replaceable>FORMAT</replaceable>]
[<option>-p </option><emphasis>STRING</emphasis>]
[<option>-t </option><emphasis>NUMBER</emphasis>]
[<option>--title=</option><replaceable>TITLE</replaceable>]
[<option>--which=</option><replaceable>WHICH</replaceable>]
[<emphasis>ARGUMENTS</emphasis>]</para>

<para>The
<emphasis role="bold">scons-time time</emphasis>
subcommand displays SCons execution times
as reported by the
<userinput>scons --debug=time</userinput>
option.</para>

<para>The
<emphasis role="bold">scons-time time</emphasis>
subcommand extracts SCons timing
from all the specified file arguments,
which should be files containing output from
running SCons with the
<option>--debug=time</option>
option.
(Normally, these would be
<emphasis role="bold">*.log</emphasis>
files generated by the
<emphasis role="bold">scons-time run</emphasis>
subcommand.)
All file name arguments will be
globbed for on-disk files.</para>

<para>If no arguments are specified,
then execution timings
will be extracted from all
<emphasis role="bold">*.log</emphasis>
files,
or the subset of them
with a prefix specified by the
<option>-p</option>
option.</para>
<variablelist>
  <varlistentry>
  <term>-C DIR, --chdir=DIR</term>
  <listitem>
<para>Changes to the specified
<emphasis>DIRECTORY</emphasis>
before looking for the specified files
(or files that match the specified patterns).</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>-f FILE, --file=FILE</term>
  <listitem>
<para>Reads configuration information from the specified
<emphasis>FILE</emphasis>.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>-fmt=FORMAT, --format=FORMAT</term>
  <listitem>
<para>Reports the output in the specified
<emphasis>FORMAT</emphasis>.
The formats currently supported are
<emphasis role="bold">ascii</emphasis>
(the default)
and
<emphasis role="bold">gnuplot</emphasis>.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>-h, --help</term>
  <listitem>
<para>Displays help text for the
<emphasis role="bold">scons-time time</emphasis>
subcommand.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>-p STRING, --prefix=STRING</term>
  <listitem>
<para>Specifies the prefix string for log files
from which to extract execution timings.
This will be used to search for log files
if no arguments are specified on the command line.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>-t NUMBER, --tail=NUMBER</term>
  <listitem>
<para>Only reports object counts from the last
<emphasis>NUMBER</emphasis>
files.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term>--which=WHICH</term>
  <listitem>
<para>Prints the execution time for the specified
<emphasis>WHICH</emphasis>
value:
<emphasis role="bold">total</emphasis>
(the total execution time),
<emphasis role="bold">SConscripts</emphasis>
(total execution time for the SConscript files themselves),
<emphasis role="bold">SCons</emphasis>
(exectuion time in SCons code itself)
or
<emphasis role="bold">commands</emphasis>
(execution time of the commands and other actions
used to build targets).
If no
<option>--which</option>
option is specified,
the default behavior is
<emphasis role="bold">total</emphasis>,
which reports the total execution time for each run.</para>
<!-- '\"========================================================================== -->
  </listitem>
  </varlistentry>
</variablelist>
</refsect2>
</refsect1>

<refsect1 id='configuration_file'><title>CONFIGURATION FILE</title>
<para>Various
<command>scons-time</command>
subcommands can read information from a specified
configuration file when passed the
<option>-f</option>
or
<option>--file</option>
options.
The configuration file is actually executed as a Python script.
Setting Python variables in the configuration file
controls the behavior of the
<command>scons-time</command>
script more conveniently than having to specify
command-line options or arguments for every run,
and provides a handy way to "shrink-wrap"
the necessary information for producing (and reporting)
consistent timing runs for a given configuration.</para>
<variablelist>
  <varlistentry>
  <term><emphasis role="bold">archive_list</emphasis></term>
  <listitem>
<para>A list of archives (files or directories)
that will be copied to the temporary directory
in which SCons will be invoked.
<markup>.tar</markup>,
<markup>.tar.gz</markup>,
<markup>.tgz</markup>
and
<markup>.zip</markup>
files will have their contents unpacked in
the temporary directory.
Directory trees and files will be copied as-is.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term><emphasis role="bold">initial_commands</emphasis></term>
  <listitem>
<para>A list of commands that will be executed
before the actual timed
<emphasis role="bold">scons</emphasis>
runs.
This can be used for commands that are necessary
to prepare the source tree-for example,
creating a configuration file
that should not be part of the timed run.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term><emphasis role="bold">key_location</emphasis></term>
  <listitem>
<para>The location of the key on Gnuplot graphing information
generated with the
<option>--format=gnuplot</option>
option.
The default is
<emphasis role="bold">bottom left</emphasis>.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term><emphasis role="bold">prefix</emphasis></term>
  <listitem>
<para>The file name prefix to be used when
running or extracting timing for this configuration.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term><emphasis role="bold">python</emphasis></term>
  <listitem>
<para>The path name of the Python executable
to be used when running or extracting information
for this configuration.
The default is the same version of Python
used to run the SCons</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term><emphasis role="bold">scons</emphasis></term>
  <listitem>
<para>The path name of the SCons script to be used
when running or extracting information
for this configuration.
The default is simply
<emphasis role="bold">scons</emphasis>.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term><emphasis role="bold">scons_flags</emphasis></term>
  <listitem>
<para>The
<emphasis role="bold">scons</emphasis>
flags used when running SCons to collect timing information.
The default value is
<option>--debug=count --debug=memory --debug=time --debug=memoizer</option>.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term><emphasis role="bold">scons_lib_dir</emphasis></term>
  <term><emphasis role="bold">scons_wrapper</emphasis></term>
  <term><emphasis role="bold">startup_targets</emphasis></term>
  <term><emphasis role="bold">subdir</emphasis></term>
  <listitem>
<para>The subdirectory of the project into which the
<command>scons-time</command>
script should change
before executing the SCons commands to time.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term><emphasis role="bold">subversion_url</emphasis></term>
  <listitem>
<para>The Subversion URL from</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term><emphasis role="bold">svn</emphasis></term>
  <listitem>
<para>The subversion executable used to
check out revisions of SCons to be timed.
The default is simple
<emphasis role="bold">svn</emphasis>.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term><emphasis role="bold">svn_co_flag</emphasis></term>
  <term><emphasis role="bold">tar</emphasis></term>
  <term><emphasis role="bold">targets</emphasis></term>
  <listitem>
<para>A string containing the targets that should be added to
the command line of every timed
<emphasis role="bold">scons</emphasis>
run.
This can be used to restrict what's being timed to a
subset of the full build for the configuration.</para>
  </listitem>
  </varlistentry>
  <varlistentry>
  <term><emphasis role="bold">targets0</emphasis></term>
  <term><emphasis role="bold">targets1</emphasis></term>
  <term><emphasis role="bold">targets2</emphasis></term>
  <term><emphasis role="bold">title</emphasis></term>
  <term><emphasis role="bold">unzip</emphasis></term>
  <term><emphasis role="bold">verbose</emphasis></term>
  <term><emphasis role="bold">vertical_bars</emphasis></term>
  <listitem>
<!-- '\"\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- -->
<para></para> <!-- FIXME: blank list item -->
  </listitem>
  </varlistentry>
</variablelist>

<refsect2 id='example'><title>Example</title>
<para>Here is an example
<command>scons-time</command>
configuration file
for a hypothetical sample project:</para>

<literallayout class="monospaced">
# The project doesn't use SCons natively (yet), so we're
# timing a separate set of SConscript files that we lay
# on top of the vanilla unpacked project tarball.
arguments = ['project-1.2.tgz', 'project-SConscripts.tar']

# The subdirectory name contains the project version number,
# so tell scons-time to chdir there before building.
subdir = 'project-1.2'

# Set the prefix so output log files and profiles are named:
#     project-000-[012].{log,prof}
#     project-001-[012].{log,prof}
# etc.
prefix = 'project'

# The SConscript files being tested don't do any SConf
# configuration, so run their normal ./configure script
# before we invoke SCons.
initial_commands = [
    './configure',
]

# Only time building the bin/project executable.
targets = 'bin/project'

# Time against SCons revisions of the branches/core branch
subversion_url = '<ulink url='http://scons.tigris.org/svn/scons/branches/core'>http://scons.tigris.org/svn/scons/branches/core</ulink>'
</literallayout> <!-- .fi -->
<!-- '\"========================================================================== -->
</refsect2>
</refsect1>

<refsect1 id='environment'><title>ENVIRONMENT</title>
<para>The
<command>scons-time</command>
script uses the following environment variables:</para>
<variablelist>
  <varlistentry>
  <term><emphasis role="bold">PRESERVE</emphasis></term>
  <listitem>
<para>If this value is set,
the
<command>scons-time</command>
script will
<emphasis>not</emphasis>
remove the temporary directory or directories
in which it builds the specified configuration
or downloads a specific version of SCons.</para>
<!-- '\"========================================================================== -->
  </listitem>
  </varlistentry>
</variablelist>
</refsect1>

<refsect1 id='see_also'><title>SEE ALSO</title>
<para><citerefentry><refentrytitle>gnuplot</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>scons</refentrytitle><manvolnum>1</manvolnum></citerefentry></para>

</refsect1>

<refsect1 id='authors'><title>AUTHORS</title>
<para>Steven Knight &lt;knight at baldmt dot com&gt;</para>
</refsect1>
</refentry>