Sie befinden sich im Service: RWTH High Performance Computing (Linux)

Login Nodes

Login Nodes

Kurzinformation

    Login nodes are login servers within the HPC Cluster that users can use to connect and access all computing resources.

    To connect, please note that:

    • MFA: Starting on Q1 2024 Multi Factor Authentication (MFA) is mandatory for all users before they can connect to the any login node, so please configure your MFA now!
    • VPN: A connection to login nodes is only possible from with the RWTH Network, RWTH VPN and most German Universities as well as Research institutions.
    • Firewall: If you can not connect to the RWTH Network from an external German University or research institution, please contact <servicedesk@itc.rwth-aachen.de> to unlock the firewall for your university / research institute.

    Use these login nodes to connect to the HPC System:

    Login NodeCPU | GPUConnection Type
    login18-1.hpc.itc.rwth-aachen.deCPUSSH, Console
    login18-2.hpc.itc.rwth-aachen.deCPUSSH, Console
    login18-3.hpc.itc.rwth-aachen.deCPUSSH, Console
    login18-4.hpc.itc.rwth-aachen.deCPUSSH, Console
     
    login18-x-1.hpc.itc.rwth-aachen.deCPURemote Desktop
    login18-x-2.hpc.itc.rwth-aachen.deCPURemote Desktop
     
    login18-g-1.hpc.itc.rwth-aachen.deNvidia GPUSSH, Console
    login18-g-2.hpc.itc.rwth-aachen.deNvidia GPUSSH, Console
     
    https://jupyterhub.hpc.itc.rwth-aachen.de:9651CPU + NVIDIA GPUBrowser, Jupyter

    Please Note: For maintenance reasons all login nodes are rebooted each Monday morning at 6 am.

    These login nodes can be used for programming, compiling, debugging, preparation and postprocessing of batch jobs.

    They are not intended for long and intensive computation runs of programs! Processes that have consumed more than 20 minutes CPU time may get killed without warning. 


    IMPORTANT:

    • Computing on the login nodes is discouraged. Please use the compute nodes!
    • Compiling, coding and result viewing can be done on login nodes, but will be faster on a compute node!
    • Using too many resources for any kind of task on a login node will trigger automated and manual responses from us, resulting in your work being lost!
    • This limitation is actively enforced. We reserve the right to terminate any process on the login nodes to maintain a good quality of service for all other users.
    • You may also receive a verbal and written warning!

    Detailinformation

    Technical Details

    This limits apply only to the login-nodes, unless specified otherwise.

    If you need a graphical session without these limits, please submit an interactive batchjob with X11 forwarding to the compute nodes.

    If you need a console session without these limits, please submit an normal salloc job to the compute nodes.

    CPU

    We use cgroups on the login nodes to configure all user processes and enforce limits. 

    Within a login node, we limit all processes of a user to a maximum of four (4) cores. We may also kill processes that use more than 20 minutes of CPU time, especially when a system becomes overloaded.

    Real physical memory (RAM)

    We limit the total amount of physical memory  (+swap) to 25% (of the total) that any user can use across all of their running processes. The following command displays the current memory quota usage:

    memquota

    Unfortunately, if a user hits this memory limit, the login-node may be unresponsive for a few seconds while the limits are enforced. As all users are affected by this, it is considerate and take this memory limits into account from the beginning.

    Virtual memory

    We do not enforce the amount of virtual memory you can use or allocate, but if your programs start  reaching to physical memory, the physical memory limit will be enforced!

    Network and Disk

    We enforce network and disk limits manually to guarantee a good quality of service for other users.

    Please use one of the dedicated systems copy, copy18-1 or copy18-2 for applications that transfer data or need high network bandwidth, e.g. copy processes.

    zuletzt geändert am 05.02.2024

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