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diff --git a/timings/README.txt b/timings/README.txt new file mode 100644 index 00000000..840c7f80 --- /dev/null +++ b/timings/README.txt @@ -0,0 +1,32 @@ +This directory contains timing configurations for SCons. + +Each configuration exists in a subdirectory. The controlling script +is named TimeSCons-run.py for the configuration. The TimeSCons-run.py +scripts use TestSCons.TimeSCons, a subclass of TestSCons.TestSCons (both +defined in ../QMTest/TestScons.py), to manage execution of the timing +runs. + +Unlike the TestSCons.TestSCons base class, the TestSCons.TimeSCons +subclass copies the contents of its containing directory to the temporary +working directory. (It avoids copying the .svn directory, and any files +or directories that start with the string "TimeSCons-".) This allows +the timing configuration files to be checked in directly to our source +code management system, instead of requiring that they be created from +in-line data inside the script. + +The simplest-possible TimeSCons-run.py script would look like: + + import TestSCons + TestSCons.TimeSCons().main() + +The above script would end up executing a SConstruct file configuration +in a temporary directory. The main() method is the standard interface +for a timing run. See its docstring for precisely what it does. + +Although the TestSCons.TimeSCons subclass copies its directory contents to +a temporary working directory for the timing run, because it is a subclass +of TestSCons.TestSCons, it *can* also create files or directories from +in-line data. This is typically done when it's necessary to create +hundreds of identical input files or directories before running the +timing test, to avoid cluttering our SCM system with hundreds of otherwise +meaningless files. |