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.. -*- rst -*-
Copyright (c) 2022-2023 Nanook Consulting. All rights reserved.
Copyright (c) 2023 Jeffrey M. Squyres. All rights reserved.
$COPYRIGHT$
Additional copyrights may follow
$HEADER$
.. The following line is included so that Sphinx won't complain
about this file not being directly included in some toctree
Hostfiles (sometimes called "machine files") are a combination of two
things:
#. A listing of hosts on which to launch processes.
#. Optionally, limit the number of processes which can be launched on
each host.
Hostfile syntax consists of one node name on each line, optionally
including a designated number of "slots":
.. code:: sh
# This is a comment line, and will be ignored
node01 slots=10
node13 slots=5
node15
node16
node17 slots=3
...
Blank lines and lines beginning with a ``#`` are ignored.
A "slot" is the PRRTE term for an allocatable unit where we can launch
a process. See the section on definition of the term ``slot`` for a
longer description of slots.
In the absence of the ``slot`` parameter, PRRTE will assign either the
number of slots to be the number of CPUs detected on the node or the
resource manager-assigned value if operating in the presence of an
RM.
.. important:: If using a resource manager, the user-specified number
of slots is capped by the RM-assigned value.
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