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pages/merlin6/02-How-To-Use-Merlin/using-modules.md

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+---
+title: Using PModules 
+#tags:
+#keywords:
+last_updated: 20 June 2019
+#summary: ""
+sidebar: merlin6_sidebar
+permalink: /merlin6/using-modules.html
+---
+
+## Environment Modules
+
+On top of the operating system stack we provide different software using the PSI developed PModule system. 
+
+PModules is the official supported way and each package is deployed by a specific expert. Usually, in PModules
+software which is used by many people will be found.
+
+If you miss any package/versions or a software with a specific missing feature, contact us. We will study if is feasible or not to install it.
+
+### Basic commands:
+
+Basic generic commands would be:
+
+```bash
+module avail                     # to see the list of available software packages provided via pmodules
+module use unstable              # to get access to a set of packages not fully tested by the community
+module load <package>/<version>  # to load specific software package with a specific version
+module search <string>           # to search for a specific software package and its dependencies.
+module list                      # to list which software is loaded in your environment
+module purge                     # unload all loaded packages and cleanup the environment
+```
+
+Also, you can load multiple packages at once. This can be useful for instance when loading a package with its dependencies:
+
+```bash
+# Single line
+module load gcc/9.2.0 openmpi/3.1.5-1_merlin6
+
+# Multiple line
+module load gcc/9.2.0
+module load openmpi/3.1.5-1_merlin6
+```
+
+In the example above, we load ``openmpi/3.1.5-1_merlin6`` but we also specify ``gcc/9.2.0`` which is a strict dependency. The dependency must be
+loaded in advance.
+
+---
+
+## When to request for new PModules packages
+
+### Missing software
+
+If you don't find a specific software and you know from other people interesing on it, it can be installed in PModules. Please contact us
+and we will try to help with that. Deploying new software in PModules may take few days.
+
+Usually installation of new software are possible as long as few users will use it. If you are insterested in to maintain this software,
+please let us know.
+
+### Missing version
+
+If the existing PModules versions for a specific package do not fit to your needs, is possible to ask for a new version.
+
+Usually installation of newer versions will be supported, as long as few users will use it. Installation of intermediate versions can
+be supported if this is strictly justified.