Provided by: scons_2.3.0-2ubuntu1_all 
NAME
scons-time - generate and display SCons timing information
SYNOPSIS
scons-time subcommand [ options... ] [ arguments... ]
Generating Timing Information
scons-time run [-hnqv] [--aegis=PROJECT] [-f FILE] [--number=NUMBER] [--outdir=OUTDIR] [-p STRING]
[--python=PYTHON] [-s DIR] [--scons=SCONS] [--svn=URL] [ARGUMENTS]
Extracting Function Timings
scons-time func [-h] [--chdir=DIR] [-f FILE] [--fmt=FORMAT] [--func=NAME] [-p STRING] [-t NUMBER]
[--title= TITLE] [ARGUMENTS]
Extracting Memory Statistics
Extracting Object Counts
scons-time obj [-h] [--chdir=DIR] [-f FILE] [--fmt=FORMAT] [-p STRING] [--stage=STAGE] [-t NUMBER]
[--title=TITLE] [ARGUMENTS]
Extracting Execution Times
scons-time time [-h] [--chdir=DIR] [-f FILE] [--fmt=FORMAT] [-p STRING] [-t NUMBER] [--title=TITLE]
[--which=WHICH] [ARGUMENTS]
Help Text
scons-time help SUBCOMMAND [...]
DESCRIPTION
The scons-time 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 scons-time script is specified by a subcommand, the first argument on the command
line. See the SUBCOMMANDS section below for information about the operation of specific subcommands.
The basic way to use scons-time is to run the scons-time run 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 scons-
time func subcommand), total memory used (the scons-time mem subcommand), object counts (the scons-time
obj subcommand) and overall execution time (the scons-time time 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 gnuplot(1) program, and so on.
There are two basic ways the scons-time run subcommand is intended to be used to gather timing statistics
for a configuration. One is to use the --svn= 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 --number= option, and can be used to look at the impact of committed changes to
the SCons code base on a particular configuration over time.
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 scons-time run subcommand without the --svn= option, in which case it simply looks in
the profile/log file output directory (the current directory by default) and automatically figures out
the next 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 scons-time run to profile it against a specific
configuration; make another change to SCons; run scons-time run again to profile it; etc.
OPTIONS
The scons-time command only supports a few global options:
-h, --help
Displays the global help text and exits, identical to the scons-time help subcommand.
-V, --version
Displays the scons-time version and exits.
Most functionality is controlled by options to the individual subcommands. See the next section for
information about individual subcommand options.
SUBCOMMANDS
The scons-time command supports the following individual subcommands.
The func Subcommand
scons-time func [-h] [--chdir=DIR] [-f FILE] [--fmt=FORMAT] [--func=NAME] [-p STRING] [-t NUMBER]
[--title= TITLE] [ARGUMENTS]
The scons-time func subcommand displays timing information for a specific Python function within SCons.
By default, it extracts information about the _main() function, which includes the Python profiler timing
for all of SCons.
The scons-time func subcommand extracts function timing information from all the specified file
arguments, which should be Python profiler output files. (Normally, these would be *.prof files
generated by the scons-time run subcommand, but they can actually be generated by any Python profiler
invocation.) All file name arguments will be globbed for on-disk files.
If no arguments are specified, then function timing information will be extracted from all *.prof files,
or the subset of them with a prefix specified by the -p option.
Options include:
-C DIRECTORY, --chdir=DIRECTORY
Changes to the specified DIRECTORY before looking for the specified files (or files that match the
specified patterns).
-f FILE, --file=FILE
Reads configuration information from the specified FILE.
-fmt=FORMAT, --format=FORMAT
Reports the output in the specified FORMAT. The formats currently supported are ascii (the
default) and gnuplot.
--func=NAME
Extracts timings for the specified function NAME. The default is to report cumulative timings for
the _main() function, which contains the entire SCons run.
-h, --help
Displays help text for the scons-time func subcommand.
-p STRING, --prefix=STRING
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.
-t NUMBER, --tail=NUMBER
Only extracts function timings from the last NUMBER files.
The help Subcommand
scons-time help SUBCOMMAND [...] The help subcommand prints help text for any other subcommands listed
as later arguments on the command line.
The mem Subcommand
The scons-time mem subcommand displays how much memory SCons uses.
The scons-time mem subcommand extracts memory use information from all the specified file arguments,
which should be files containing output from running SCons with the --debug=memory option. (Normally,
these would be *.log files generated by the scons-time run subcommand.) All file name arguments will be
globbed for on-disk files.
If no arguments are specified, then memory information will be extracted from all *.log files, or the
subset of them with a prefix specified by the -p option.
-C DIR, --chdir=DIR
Changes to the specified DIRECTORY before looking for the specified files (or files that match the
specified patterns).
-f FILE, --file=FILE
Reads configuration information from the specified FILE.
-fmt=FORMAT, --format=FORMAT
Reports the output in the specified FORMAT. The formats currently supported are ascii (the
default) and gnuplot.
-h, --help
Displays help text for the scons-time mem subcommand.
-p STRING, --prefix=STRING
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.
--stage=STAGE
Prints the memory used at the end of the specified STAGE: pre-read (before the SConscript files
are read), post-read , (after the SConscript files are read), pre-build (before any targets are
built) or post-build (after any targets are built). If no --stage option is specified, the
default behavior is post-build, which reports the final amount of memory used by SCons during each
run.
-t NUMBER, --tail=NUMBER
Only reports memory statistics from the last NUMBER files.
The obj Subcommand
scons-time obj [-h] [--chdir=DIR] [-f FILE] [--fmt=FORMAT] [-p STRING] [--stage=STAGE] [-t NUMBER]
[--title=TITLE] [ARGUMENTS]
The scons-time obj subcommand displays how many objects of a specific named type are created by SCons.
The scons-time obj subcommand extracts object counts from all the specified file arguments, which should
be files containing output from running SCons with the --debug=count option. (Normally, these would be
*.log files generated by the scons-time run subcommand.) All file name arguments will be globbed for on-
disk files.
If no arguments are specified, then object counts will be extracted from all *.log files, or the subset
of them with a prefix specified by the -p option.
-C DIR, --chdir=DIR
Changes to the specified DIRECTORY before looking for the specified files (or files that match the
specified patterns).
-f FILE, --file=FILE
Reads configuration information from the specified FILE.
-fmt=FORMAT, --format=FORMAT
Reports the output in the specified FORMAT. The formats currently supported are ascii (the
default) and gnuplot.
-h, --help
Displays help text for the scons-time obj subcommand.
-p STRING, --prefix=STRING
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.
--stage=STAGE
Prints the object count at the end of the specified STAGE: pre-read (before the SConscript files
are read), post-read , (after the SConscript files are read), pre-build (before any targets are
built) or post-build (after any targets are built). If no --stage option is specified, the
default behavior is post-build, which reports the final object count during each run.
-t NUMBER, --tail=NUMBER
Only reports object counts from the last NUMBER files.
The run Subcommand
scons-time run [-hnqv] [--aegis=PROJECT] [-f FILE] [--number=NUMBER] [--outdir=OUTDIR] [-p STRING]
[--python=PYTHON] [-s DIR] [--scons=SCONS] [--svn=URL] [ARGUMENTS] The scons-time run subcommand is the
basic subcommand for profiling a specific configuration against a version of SCons.
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 scons-time run subcommand
understands file suffixes like .tar, .tar.gz, .tgz and .zip 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.
Once the file or directory arguments are unpacked or copied to the temporary directory, the scons-time
run subcommand runs the requested version of SCons against the configuration three times:
Startup
SCons is run with the --help 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.
Full build
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 targets keyword in a configuration file; see below
for details.
Rebuild
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.
Each invocation captures the output log file and a profile.
The scons-time run subcommand supports the following options:
--aegis=PROJECT
Specifies the Aegis PROJECT from which the version(s) of scons being timed will be extracted.
When --aegis is specified, the --number=NUMBER option specifies delta numbers that will be tested.
Output from each invocation run will be placed in file names that match the Aegis delta numbers.
If the --number= option is not specified, then the default behavior is to time the tip of the
specified PROJECT.
-f FILE, --file=FILE
Reads configuration information from the specified FILE. 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 CONFIGURATION FILE section below for information
about the configuration file parameters.
-h, --help
Displays help text for the scons-time run subcommand.
-n, --no-exec
Do not execute commands, just printing the command-line equivalents of what would be executed.
Note that the scons-time script actually executes its actions in Python, where possible, for
portability. The commands displayed are UNIX equivalents of what it's doing.
--number=NUMBER
Specifies the run number to be used in the names of the log files and profile outputs generated by
this run.
When used in conjunction with the --aegis=PROJECT option, NUMBER specifies one or more comma-
separated Aegis delta numbers that will be retrieved automatically from the specified Aegis
PROJECT.
When used in conjunction with the --svn=URL option, NUMBER specifies one or more comma-separated
Subversion revision numbers that will be retrieved automatically from the Subversion repository at
the specified URL. Ranges of delta or revision numbers may be specified be separating two numbers
with a hyphen (-).
Example:
% scons-time run --svn=http://scons.tigris.org/svn/trunk --num=1247,1249-1252 .
-p STRING, --prefix=STRING
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
(.tgz, .tar.gz or .zip).
--python=PYTHON
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
scons-time
command itself.
-q, --quiet
Suppresses display of the command lines being executed.
-s DIR, --subdir=DIR
Specifies the name of directory or subdirectory
from which the commands should be executed.
The default is XXX
--scons=SCONS
Specifies a path to the SCons script to be used
for the timing runs.
The default is XXX
--svn=URL, --subversion=URL
Specifies the
URL
of the Subversion repository from which the
version(s) of
scons
being timed will be extracted.
When
--svn
is specified, the
--number=NUMBER
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
--number=
option is not specified,
then the default behavior is to time the
HEAD
of the specified
URL.
-v, --verbose
Displays the output from individual commands to the screen
(in addition to capturing the output in log files).
The time Subcommand
scons-time time [-h] [--chdir=DIR] [-f FILE] [--fmt=FORMAT] [-p STRING] [-t NUMBER] [--title=TITLE]
[--which=WHICH] [ARGUMENTS]
The scons-time time subcommand displays SCons execution times as reported by the scons --debug=time
option.
The scons-time time subcommand extracts SCons timing from all the specified file arguments, which should
be files containing output from running SCons with the --debug=time option. (Normally, these would be
*.log files generated by the scons-time run subcommand.) All file name arguments will be globbed for on-
disk files.
If no arguments are specified, then execution timings will be extracted from all *.log files, or the
subset of them with a prefix specified by the -p option.
-C DIR, --chdir=DIR
Changes to the specified DIRECTORY before looking for the specified files (or files that match the
specified patterns).
-f FILE, --file=FILE
Reads configuration information from the specified FILE.
-fmt=FORMAT, --format=FORMAT
Reports the output in the specified FORMAT. The formats currently supported are ascii (the
default) and gnuplot.
-h, --help
Displays help text for the scons-time time subcommand.
-p STRING, --prefix=STRING
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.
-t NUMBER, --tail=NUMBER
Only reports object counts from the last NUMBER files.
--which=WHICH
Prints the execution time for the specified WHICH value: total (the total execution time),
SConscripts (total execution time for the SConscript files themselves), SCons (exectuion time in
SCons code itself) or commands (execution time of the commands and other actions used to build
targets). If no --which option is specified, the default behavior is total, which reports the
total execution time for each run.
CONFIGURATION FILE
Various scons-time subcommands can read information from a specified configuration file when passed the
-f or --file options. The configuration file is actually executed as a Python script. Setting Python
variables in the configuration file controls the behavior of the scons-time 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.
aegis The Aegis executable for extracting deltas. The default is simply aegis.
aegis_project
The Aegis project from which deltas should be extracted. The default is whatever is specified
with the --aegis= command-line option.
archive_list
A list of archives (files or directories) that will be copied to the temporary directory in which
SCons will be invoked. .tar, .tar.gz, .tgz and .zip files will have their contents unpacked in
the temporary directory. Directory trees and files will be copied as-is.
initial_commands
A list of commands that will be executed before the actual timed scons 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.
key_location
The location of the key on Gnuplot graphing information generated with the --format=gnuplot
option. The default is bottom left.
prefix The file name prefix to be used when running or extracting timing for this configuration.
python 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
scons The path name of the SCons script to be used when running or extracting information for this
configuration. The default is simply scons.
scons_flags
The scons flags used when running SCons to collect timing information. The default value is
--debug=count --debug=memory --debug=time --debug=memoizer.
scons_lib_dir
scons_wrapper
startup_targets
subdir The subdirectory of the project into which the scons-time script should change before executing
the SCons commands to time.
subversion_url
The Subversion URL from
svn The subversion executable used to check out revisions of SCons to be timed. The default is simple
svn.
svn_co_flag
tar
targets
A string containing the targets that should be added to the command line of every timed scons run.
This can be used to restrict what's being timed to a subset of the full build for the
configuration.
targets0
targets1
targets2
title
unzip
verbose
vertical_bars
Example
Here is an example scons-time configuration file for a hypothetical sample project:
# 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 = 'http://scons.tigris.org/svn/scons/branches/core'
ENVIRONMENT
The scons-time script uses the following environment variables:
PRESERVE
If this value is set, the scons-time script will not remove the temporary directory or directories
in which it builds the specified configuration or downloads a specific version of SCons.
SEE ALSO
gnuplot(1), scons(1)
AUTHORS
Steven Knight <knight at baldmt dot com>
March 2013 SCONS-TIME(1)