-**Parent tags:** :ref:`pf_tag_platform`, :ref:`pf_tag_zone` |br|
-**Children tags:** none |br|
-**Attributes:**
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-:``id``: The identifier of the cluster. Facilitates referring to this cluster.
-:``prefix``: Each node of the cluster has to have a name. This name will be prefixed with this prefix.
-:``suffix``: Each node of the cluster will be suffixed with this suffix
-:``radical``: Regexp used to generate cluster nodes name.
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- Syntax: "10-20" will give you 11 machines numbered from 10 to 20, "10-20;2" will give you 12 machines, one with the number 2, others numbered as before.
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- The produced number is concatenated between prefix and suffix to form machine names.
-:``speed``: Same as the ``speed`` attribute of the :ref:`pf_tag_host` tag.
-:``core``: Same as the ``core`` attribute of the :ref:`pf_tag_host` tag.
-:``bw``: Bandwidth for the links between nodes and backbone (if any). See :ref:`pf_tag_link` for syntax/details.
-:``lat``: Latency for the links between nodes and backbone (if any). See :ref:`pf_tag_link` for syntax/details.
-:``sharing_policy``: Sharing policy for the links between nodes and backbone (if any). See :ref:`pf_tag_link` for syntax/details.
-:``bb_bw``: Bandwidth for backbone (if any). See :ref:`pf_tag_link` for syntax/details.
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- If bb_bw and bb_lat attributes are omitted, no backbone is created (alternative cluster architecture described earlier).
-:``bb_lat``: Latency for backbone (if any). See :ref:`pf_tag_link` section for syntax/details.
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- If bb_lat and bb_bw attributes are omitted, no backbone is created (alternative cluster architecture described earlier).
-:``bb_sharing_policy``: Sharing policy for the backbone (if any). See :ref:`pf_tag_link` section for syntax/details.
-:``limiter_link``: Bandwidth for limiter link (if any).
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- This adds a specific link for each node, to set the maximum bandwidth reached when communicating in both directions at the same time.
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- In theory this value should be 2*bw for splitduplex links, but in reality this might be less. This value will depend heavily on the communication model, and on the cluster's hardware, so no default value can be set, this has to be measured.
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- More details can be obtained in `Toward Better Simulation of MPI Applications on Ethernet/TCP Networks <https://hal.inria.fr/hal-00919507/>`_
-:``loopback_bw``: Bandwidth for loopback (if any). See :ref:`pf_tag_link` section for syntax/details.
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- If loopback_bw and loopback_lat attributes are omitted, no loopback link is created and all intra-node communication will use the main network link of the node.
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- The sharing policy of a loopback link is **FATPIPE** :ref:`pf_tag_link`.
-:``loopback_lat``: Latency for loopback (if any). See loopback_bw for more info.
-:``topology``: Network topology to use.