02:05 PM - 03:50 PM (105 min)
Steve Brandt (Louisiana State University)
Abstract: Creating a thorn for the Einstein Toolkit has been a successful collaborative framework for numerical relativity. For the last twenty-five years, groups from arround the world have been contributing new physics and infrastructure thorns.
And while the task of creating a thorn is not extraordinarily difficult, there is still a non-trivial learning curve that must be crossed before thorns can be correctly written.
The NRPy+ Python tools for using Sympy and generating physics code simplified the creation of physics thorns by allowing thorn authors to work with symbolic differential equations without worrying about the details of loops and boilerplate C++ code.
However, NRPy+ is not a Cactus-only tool and does not automate all of the details of thorn generation.
This tutorial is about an addition to the NRPy+ toolset which helps the authors of physics thorns cover this last mile. While the tool is still in its early stages of develpoment, it is usable and ready for community engagement. This tutorial will show users how to create a wave equation thorn that will compile and run both for the Carpet driver and the CarpetX driver.
For the hands-on part of the tutorial we will be using a cloud based environment to simplify setting up the toolkit, hosted at Perimeter Institute of Theoretical Physics.
There are two different environments offered:
Please make sure to select the correct one for the tutorial you are attending.
All required files are already present in the environment, you do not need to upload any files or download any software.
Each environment will be available only for the duration of each tutorial. Data stored persists in between logins but will be removed after the end of the workshop.
Please go to
https://et2022uidaho.ncsa.illinois.edu
and choose a user name and password. Make sure Password and Password2
match, otherwise account creation will fail.
You will also need to enter a security code into the Code field. This code
will be shared at the tutorial days via whiteboard and Zoom chat. Please do not
share that code with anyone.
Account creation is automatic and your account is active the moment you submit the account creation form.
Once your account has been created you can log in via
https://et2022uidaho.ncsa.illinois.edu
filling out only the Username and Password fields.
Please select the files you would like to download in Jupyter’s file manager
then use the Download button in the toolbar above the list of files to
download them to your laptop.
Jupyter has built in editor for text files that opens automatically if you click on a source code file.
You can create new files using the New button in the file listing and
selecting Text document. Once the editor starts up you can rename the file
using the File/Rename menu item.
If your setup has become corrupted and you would like to start over again from a fresh setup, please do the following:
New button in the file listingrm -rf $HOMEControl Panel button then Stop My ServerThis will restore all files to the state they were at your initial login.