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    Command:

    lamboot

    
    
    

    SYNTAX

           lamboot [-b] [-d] [-h] [-H] [-l] [-s] [-v] [-V] [-x] [-nn] [-np] [-c
                  <conf file>] [-prefix </lam/install/path/>] [-sessionprefix
                  <value>] [-sessionsuffix <value>] [-withlamprefixpath <value>]
                  [-ssi <key> <value>] [<bhost>]
    
    
    

    OPTIONS

           -b      Assume local and remote shell are the same.  This means that
                   only one remote shell invocation is used to each node.  If -b
                   is not used, two remote shell invocations are used to each
                   node.
    
           -d      Turn on debugging output.  This implies -v.
    
           -h      Print the command help menu.
    
           -l      Delay hostname-to-IP-address resolution.
    
           -prefix Use the LAM installation specified in </lam/install/path/>.
                   Not compatible with LAM/MPI versions prior to 7.1.
    
           -s      Close stdio on the local node.
    
           -ssi <key> <value>
                   Send arguments to various SSI modules.  See the "SSI" section,
                   below.
    
           -v      Be verbose.
    
           -x      Run in fault tolerant mode.
    
           -H      Do not display the command header.
    
           -nn     Don't add "-n" to the remote agent command line
    
           -np     Do not force the execution of $HOME/.profile on remote hosts
    
           -session-prefix <value>
                   Set the session prefix, overriding LAM_MPI_SESSION_PREFIX.
    
           -session-suffix <value>
                   Set the session suffix, overriding LAM_MPI_SESSION_SUFFIX.
    
           -withlamprefixpath <value>
                   Override the internal installation path.  For internal use on-
                   ly, do not use unless you know what you are doing.
    
    
    

    ENVIRONMENT VARIABLES

           LAM_MPI_SESSION_PREFIX
    
           LAM_MPI_SESSION_SUFFIX
                     It is possible to change the session directory used by
    
           The lamboot tool starts the LAM software on each of the machines speci-
           fied in the boot schema, <bhost>.  The boot schema specifies the host-
           names of nodes to be used in the run-time MPI environment, and option-
           ally lists how may CPUs LAM may used on each node.  The user may wish
           to first run the recon(1) tool to verify that LAM can be started.
    
           Starting LAM is a three step procedure.  In the first step, hboot(1) is
           invoked on each of the specified machines.  Then each machine allocates
           a dynamic port and communicates it back to lamboot which collects them.
           In the third step, lamboot gives each machine the list of ma-
           chines/ports in order to form a fully connected topology.  If any ma-
           chine was not able to start, or if a timeout period expires before the
           first step completes, lamboot invokes lamwipe(1) to terminate LAM and
           reports the error.
    
           The <bhost> file is a LAM boot schema written in the host file syntax.
           See bhost(5).  Instead of the command line, a boot schema can be speci-
           fied in the LAMBHOST environment variable.  Otherwise a default file,
           lam-bhost.def, is used.  LAM searches for <bhost> first in the local
           directory and then in the installation directory under etc/.
    
           In addition, lamboot uses a process schema for the individual LAM
           nodes.  A process schema (see conf(5)) is a description of the process-
           es which constitute the operating system on a node.  In general, the
           system administrator maintains this file -- LAM/MPI users will general-
           ly not need to change this file.  It is also possible for the user to
           customize the LAM software with a private process schema.
    
       The bhost file
           The format of the <bhost> file is documented in the bhost(5) man page.
    
           lamboot will resolve all names in <bhost> on the node in which lamboot
           was invoked (the origin node).  After that, LAM will only use IP ad-
           dresses, not names.  Specifically, the name resolution configuration on
           all other nodes is not used.  Hence, the the origin node must be able
           to resolve all the names in <bhost> to addresses that are reachable by
           all other nodes.
    
           A common mistake is to list localhost (or any name that resolves to the
           special address 127.0.0.1 -- the loopback TCP/IP device) in a <bhost>
           file that contains other nodes.  In this case, the address 127.0.0.1
           would be sent to each of the other nodes as the address of the origin
           node.  If the other nodes try to use 127.0.0.1 to contact the origin
           node, they will actually be contacting themselves, and would eventually
           timeout and fail.
    
           The IP addresses obtained from <bhost> are used for LAM's meta mes-
           sages: startup and shutdown of jobs, out-of-band messages used for co-
           ordination, etc.  The amount of traffic is fairly low (unless using the
           "lamd" mode of MPI message passing, in which case all MPI traffic will
           also utilize LAM's meta messages for transport -- see mpirun(1)).  When
           using the TCP RPI, these IP addresses are also used for MPI message
           "fast" network for MPI messages.  As such, <bhost> should list the IP
           names (or addresses) of all the "fast" NICs.  However, if the LAM RPI
           does not use TCP/IP (e.g., the Myrinet/GM RPI), the <bhost> file should
           probably list the "slow" NICs so that LAM's meta message traffic does
           not cause overhead and potentially detract from performance on the
           "fast" network from other high-performance applications.
    
       Delaying hostname lookups
           Normally, name resolution of hostnames is done on the machines where
           lamboot is invoked.  This is done for optimization reasons, so that the
           list of hostnames only needs to be resolved once (potentially minimiz-
           ing the amount of DNS or other hostname-lookup network traffic).
    
           However, in some non-uniform networking environments, this is not suf-
           ficient because each host may have a different IP address on each of
           its peers.  For example, host A may have address Z on host B, but have
           address Y on host C.
    
           The -l option to lamboot will cause LAM to distribute hostnames to each
           node rather than a fully resolved set of IP addresses.  Hence, each
           node where LAM is booted will do its own name resolution on the list of
           hostnames.
    
       SSI (System Services Interface)
           The -ssi switch allows the passing of parameters to various SSI mod-
           ules.  LAM's SSI modules are described in detail in lamssi(7).  SSI
           modules have direct impact on MPI programs because they allow tunable
           parameters to be set at run time (such as which boot device driver to
           use, what parameters to pass to that driver, etc.).
    
           The -ssi switch takes two arguments: <key> and <value>.  The <key> ar-
           gument generally specifies which SSI module will receive the value.
           For example, the <key> "boot" is used to select which RPI to be used
           for starting processes on remote nodes.  The <value> argument is the
           value that is passed.  For example:
    
           lamboot -ssi boot tm
               Tells LAM to use the "tm" boot module for native launching in PB-
               SPro / OpenPBS environments (the tm boot module does not require a
               boot schema).
    
           lamboot -ssi boot rsh -ssi rsh_agent "ssh -x" boot_schema
               Tells LAM to use the "rsh" boot module, and tells the rsh module to
               use "ssh -x" as the specific agent to launch executables on remote
               nodes.
    
           And so on.  LAM's boot SSI modules are described in lamssi_boot(7).
           This page should be consulted for specific actions that are taken by,
           and how to tweak the run-time behavior of each boot module.
    
           The -ssi switch can be used multiple times to specify different <key>
           and/or <value> arguments.  If the same <key> is specified more than
           All tweakable aspects of launching executables on remote nodes during
           lamboot are discussed in lamssi(7) and lamssi_boot(7).  Topics include
           (but are not limited to): discovery of remote shell, run-time overrides
           of the agent use to launch remote executables (e.g., rsh and ssh), etc.
    
       Closing stdio
           The stdio of each LAM daemon on a remote host that is launched by lam-
           boot is closed by default.  Normally, the stdio of the LAM daemon
           launched on the local host is left open so that the internal LAM tst-
           dio(3) package works properly.  However, it is sometimes desirable to
           close the stdio of the local LAM daemon as well.  For example:
    
              rsh somenode lamboot -s hostfile
    
           This is because rsh waits for two conditions before exiting: lamboot to
           exit, and stdout / stderr to be closed.  Without -s, stdout / stderr
           would not be closed, and rsh (and ssh) will hang even though lamboot
           had completed.  -s causes the stdout / stderr of the local LAM daemon
           to be closed upon invocation, which will allow rsh to complete.  Using
           -s will not affect lamboot in any other way, but it will prevent the
           tstdio(3) package from working properly.
    
       Fault Tolerance
           If the -x option is given, LAM runs in fault tolerant mode.  In this
           mode, nodes exchange ''heart beat'' messages periodically to make sure
           all nodes are running and the links connecting them are operational.
           When a node's heart beats stop, it is declared ''dead'' and all LAM
           nodes (and processes) are notified.  This allows users to write fault
           tolerant applications that can degrade gracefully, or fully recover by
           replacing the defunct node with another (see lamgrow(1)).  Since this
           mode introduces a performance penalty, it is not activated by default.
    
    
    

    EXAMPLES

           lamboot -v
               Start LAM on the machines described in the default boot schema.
               Report about important steps as they are done.
    
           lamboot -d hostfile
               Start LAM on the machines described in file hostfile.  Provide in-
               credibly detailed reports on what is happening at each stage in the
               boot process.
    
           lamboot mynodes
               Start LAM on the machines described in the boot schema mynodes.
               Operate silently.
    
    
    

    FILES

           laminstalldir/etc/lam-bhost.def   default boot schema file, where
                                             "laminstalldir" is the directory
                                             where LAM/MPI was installed
    
           laminstalldir/etc/lam-conf.lamd   default process schema file for LAM
    
    
    

    LAM 7.1.2 March, 2006 LAMBOOT(1)

    
    
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