For questions about the operation of the HPC system, about parallel computing, the batch system, or development software, please contact our HPC team at [hpc-mgr@uni-koeln.de](mailto:hpc-mgr@uni-koeln.de).
#### Scientific support
For questions regarding scientific applications or scientific computing in general, please contact our staff for scientific support at [wiss-anwendung@uni-koeln.de](mailto:wiss-anwendung@uni-koeln.de).
#### HPC accounts
Please have a look at [this page](accounts.md) for information on how to obtain an HPC account. Should you have further questions, our account team at [hpc-accounts@uni-koeln.de](mailto:hpc-accounts@uni-koeln.de) will be happy to help.
#### Help request
If you send a **support request**, please provide all relevant information to describe your case. In particular, **error messages** are crucial for analysis and should be provided with the request. Depending on your application, error messages are usually printed to the standard error (`stderr`) and/or the standard output (`stdout`) stream so that you will either see them passing by on the screen or find them in a corresponding file. In addition, accompanying information is often helpful to track down errors. For instance, if the batch system fails to run a job, you should provide the job identifier (`<jobid>`) with your report. If building an application fails, you should provide name and version of the compiler and the libraries used.
#### Attention block NERSC
The RRZK team handles hundreds of support requests per year. In order to ensure efficient and timely resolution of issues, please include in your request as much as possible of the following information:
* error messages
* jobids
* location of relevant files, such as:
* input/output
* job scripts
* source code
* executables
* output of module list
* any steps you have tried
* steps to reproduce
#### Phone support
Consulting and account-support phone services are not available.
To report an urgent system issue, you may call the RRZK at +49 221 470-89555 (local and international) or, preferably, write an email to [hpc-mgr@uni-koeln.de](mailto:hpc-mgr@uni-koeln.de).
If you encounter any problems, please write to hpc-mgr@uni-koeln.de .
