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lamhalt - Online in the Cloud

Run lamhalt in OnWorks free hosting provider over Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

This is the command lamhalt that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator



lamhalt - Shutdown the LAM/MPI run-time environment.


lamhalt [-dhHv]


-d Turn on debugging mode. This implies -v.

-h Print the command help menu.

-i Return immediately (even before the LAM universe is fully halted); deprecated

-H Suppress printing the header message.

-v Be verbose.


The lamhalt tool terminates the LAM software on each of the nodes that were initially
booted with lamboot and/or lamgrow. No additional command line arguments are necessary -
lamhalt simply sends a message to each remote node telling it to shut down. Each remote
node invokes tkill(1) locally to shut down. See tkill(1) for a description of how LAM is
terminated on each node.

lamhalt may fail if one of the remote nodes has failed, and does not respond to lamhalt's
queries. In this case, the lamwipe(1) command should be used to shut down LAM/MPI. If
lamwipe(1) fails, the user can manually invoke tkill(1) on the troubled node. In extreme
cases, the user may have to terminate individual LAM processes with kill(1).

Older versions of lamhalt would return 1-3 seconds before the entire LAM universe was shut
down. This caused problems for some LAM users, particularly those who had scripts that
invoked lamboot immediately after lamhalt. lamhalt has therefore been changed to wait
until the entire LAM universe is down before exiting. This makes the execution of lamhalt
take a few seconds (typically less than 5).

For users who want the old lamhalt behavior, use the -i (or "immediate") switch, which
will cause lamhalt to return immediately, likely before the entire LAM universe has been
taken down.


lamhalt -d
Shutdown LAM on the machines and be verbose about its actions.

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