.. _ft2_system_use:

System use
===========

There are four ways to use the equipment, depending on the type of
resources and interactivity that are needed:

- **Interactive use**
   when connecting to the computer you have access to
   limited and shared resources, invalid to perform
   simulations, but to make small compilations, work with
   files and interact with the system. The maximum memory available
   is 8GB
- **Remote Desktop**
   for remote desktop access you can
   access through a browser to the following URL:
   `https://portalusuarios.cesga.es/tools/remote\_vis <https://portalusuarios.cesga.es/tools/remote_vis>`_
   through which you have access to a complete graphic system X11
   to display and access those applications that
   have a graphical interface. However, it will not be possible
   perform long simulations or use more than 32GB of memory.
- **Dedicated interactive nodes** 
   it is possible to start sessions
   interactive but with dedicated resources using the command
   “compute” (for more information it can be used with the option
   --help) from the node the user connects to. Still, the
   maximum resources available are 24 cores and 5GB of memory per core and
   up to 8 hours.
- **Using the queuing system**
   to perform simulations
   with multiple cores and large amounts of memory and time, it is
   necessary to use the queuing system, which guarantees the resources
   assigned to each user. The following section describes how
   queuing system is used.

.. figure:: _static/screenshots/system_use.png
   :align: center