An Advanced Simulation & Computing (ASC) Academic Strategic Alliances Program (ASAP) Center at The University of Chicago The Center for Astrophysical Thermonuclear Flashes Setting Up Your Problem A Beginner’s Guide

The ASC/Alliances Center for Astrophysical Thermonuclear Flashes The University of Chicago What’s Setup?  Very basically, the Flash code is made up of general independent pieces, called modules, which can be put together and reused to solve different problems  By running the setup script you specify the problem you want to solve, locate the needed modules and link all the source code to the object directory --- Then you can compile the code.

The ASC/Alliances Center for Astrophysical Thermonuclear Flashes The University of Chicago First Setup Example  From the main flash directory, /FLASH2/ type./setup sedov -2d -auto command problem name dimensionSetup script determines which modules to include based on the problem name (rather than manually) To run setup you shouldn’t need to modify the setup script (FLASH2/bin/setup.py)

The ASC/Alliances Center for Astrophysical Thermonuclear Flashes The University of Chicago Setup options -auto: setup script will automatically generate the Modules file based on the problem you specify INCLUDE database/amr/paramesh2.0 INCLUDE driver/time_dep INCLUDE gravity/null INCLUDE hydro/explicit/split/ppm INCLUDE io/amr/hdf5_serial INCLUDE materials/eos/gamma INCLUDE mesh/amr/paramesh2.0/second_order_old INCLUDE util/mappers INCLUDE util/tools INCLUDE util/wrapping If you don’t use the -auto flag, you must have a valid Modules file in the top FLASH directory (FLASH2/Modules) Try manually changing io/amr/hdf5_serial to io/amr/hdf5_parallel - Then run setup without the -auto flag Sample Modules File

The ASC/Alliances Center for Astrophysical Thermonuclear Flashes The University of Chicago Setup Options -with-module= : force a specific module to be used in setup  Another way to use a specific module in setup is with the -with-module option./setup sedov -2d -auto -with-module=io/amr/hdf5_parallel

The ASC/Alliances Center for Astrophysical Thermonuclear Flashes The University of Chicago More Setup Options -autoAutomatically generates the Modules file -with-module= Forces a specific module to be used -[123]dSpecifies the dimension, default is 2d -nxb= -nyb= -nzb= Specifies number of zones/block, default is 8 -maxblocks= Assigns maxblocks per processor. Defaults are in place but you may want to modify depending on problem and machine specs -site= | -ostype= Allows you to directly specify the host or ostype. Typically setup finds this info but on some machines it isn’t directly accessible. -site=sphere.asci.uchicago.edu or -ostype=Linux -debug | -test-debug: makes compiler put debugging symbols in executable, possibly checks for array out of bounds conditions, etc -test: compiles code with no debugging or optimization options -opt: compiles code for highest performance (default) -portableNormally setup links files from the source directory to the object directory. With -portable files are copied to object dir instead -objdir= By default setup script links all files needed in compilation to the object directory. The -objdir flag allows you to specify a different or new directory -preprocessRuns the preprocessor cpp on all source files -verboseMore wordy explanations during setup

The ASC/Alliances Center for Astrophysical Thermonuclear Flashes The University of Chicago Adding a New Setup  To see all of the current setups go to FLASH2/setups/  All of the setups have at least these 3 things in common Config file flash.par file init_block.F90 file  Certain problems may require other data files or inputs  Look at sedov setup as an example

The ASC/Alliances Center for Astrophysical Thermonuclear Flashes The University of Chicago Adding a New Setup  Config Contains needed modules Required runtime parameters (default)  flash.par Runtime parameters (these override Config parameters)  init_block.F90 Initializes solution on the mesh Sets up the initial values of your problem