ORTE-DVM(1) Open MPI ORTE-DVM(1)NAME
orte-dvm, ompi_dvm - Establish a Distributed Virtual Machine (DVM).
Note: orte-dvm and ompi-dvm are synonyms for each other. Using either
of the names will produce the same behavior.
SYNOPSISorte-dvm [ options ]
Invoking orte-dvm via an absolute path name is equivalent to specifying
the --prefix option with a <dir> value equivalent to the directory
where orte-dvm resides, minus its last subdirectory. For example:
% /usr/local/bin/orte-dvm ...
is equivalent to
% orte-dvm--prefix /usr/local
QUICK SUMMARYorte-dvm will establish a DVM that can be used to execute subsequent
applications. Use of orte-dvm can be advantageous, for example, when
you want to execute a number of short-lived tasks. In such cases, the
time required to start the ORTE DVM can be a significant fraction of
the time to execute the overall application. Thus, creating a persis‐
tent DVM can speed the overall execution. In addition, a persistent DVM
will support executing multiple parallel applications while maintaining
separation between their respective cores.
OPTIONS-h, --help
Display help for this command
-V, --version
Print version number. If no other arguments are given, this
will also cause orte-dvm to exit.
Use one of the following options to specify which hosts (nodes) of the
cluster to use for the DVM.
-H, -host, --host <host1,host2,...,hostN>
List of hosts for the DVM.
-hostfile, --hostfile <hostfile>
Provide a hostfile to use.
-machinefile, --machinefile <machinefile>
Synonym for -hostfile.
--prefix <dir>
Prefix directory that will be used to set the PATH and
LD_LIBRARY_PATH on the remote node before invoking the ORTE dae‐
mon.
Setting MCA parameters:
-gmca, --gmca <key> <value>
Pass global MCA parameters that are applicable to all contexts.
<key> is the parameter name; <value> is the parameter value.
-mca, --mca <key> <value>
Send arguments to various MCA modules. See the "MCA" section,
below.
-report-uri, --report-uri <channel>
Print out orte-dvm's URI during startup. The channel must be
either a '-' to indicate that the URI is to be output to stdout,
a '+' to indicate that the URI is to be output to stderr, or a
filename to which the URI is to be written.
The following options are useful for developers; they are not generally
useful to most ORTE and/or MPI users:
-d, --debug-devel
Enable debugging of the ORTE layer.
--debug-daemons-file
Enable debugging of the ORTE daemons in the DVM, storing output
in files.
There may be other options listed with orte-dvm--help.
DESCRIPTIONorte-dvm starts a Distributed Virtual Machine (DVM) by launching a dae‐
mon on each node of the allocation, as modified or specified by the
-host and -hostfile options. Applications can subsequently be executed
using the orte-submit command. The DVM remains in operation until
receiving the orte-submit -terminate command.
Specifying Host Nodes
Host nodes can be identified on the orte-dvm command line with the
-host option or in a hostfile.
For example,
orte-dvm-H aa,aa,bb ./a.out
launches two processes on node aa and one on bb.
Or, consider the hostfile
% cat myhostfile
aa slots=2
bb slots=2
cc slots=2
Here, we list both the host names (aa, bb, and cc) but also how many
"slots" there are for each. Slots indicate how many processes can
potentially execute on a node. For best performance, the number of
slots may be chosen to be the number of cores on the node or the number
of processor sockets. If the hostfile does not provide slots informa‐
tion, a default of 1 is assumed. When running under resource managers
(e.g., SLURM, Torque, etc.), Open MPI will obtain both the hostnames
and the number of slots directly from the resource manger.
2.1.1 May 10, 2017 ORTE-DVM(1)
