[mpiexec@ranjit] HYDU_parse_hostfile (./utils/args/args.c:276): unable to open host file: machinefile
[mpiexec@ranjit] mfile_fn (./ui/mpich/utils.c:207): error parsing hostfile
[mpiexec@ranjit] match_arg (./utils/args/args.c:115): match handler returned error
[mpiexec@ranjit] HYDU_parse_array (./utils/args/args.c:140): argument matching returned error
[mpiexec@ranjit] HYD_uii_mpx_get_parameters (./ui/mpich/utils.c:1033): error parsing input array

Usage: ./mpiexec [global opts] [exec1 local opts] : [exec2 local opts] : ...

Global options (passed to all executables):

  Global environment options:
    -genv {name} {value}             environment variable name and value
    -genvlist {env1,env2,...}        environment variable list to pass
    -genvnone                        do not pass any environment variables
    -genvall                         pass all environment variables (default)

  Other global options:
    -f {name}                        file containing the host names
    -hosts {host list}               comma separated host list
    -wdir {dirname}                  working directory to use
    -configfile {name}               config file containing MPMD launch options


Local options (passed to individual executables):

  Local environment options:
    -env {name} {value}              environment variable name and value
    -envlist {env1,env2,...}         environment variable list to pass
    -envnone                         do not pass any environment variables
    -envall                          pass all environment variables (default)

  Other local options:
    -n/-np {value}                   number of processes
    {exec_name} {args}               executable name and arguments


Hydra specific options (treated as global):

  Bootstrap options:
    -bootstrap                       bootstrap server to use (ssh rsh fork slurm ll lsf sge persist)
    -bootstrap-exec                  executable to use to bootstrap processes
    -enable-x/-disable-x             enable or disable X forwarding

  Resource management kernel options:
    -rmk                             resource management kernel to use (none pbs)

  Hybrid programming options:
    -ranks-per-proc                  assign so many ranks to each process

  Process-core binding options:
    -binding                         process-to-core binding mode
    -bindlib                         process-to-core binding library (hwloc plpa)

  Checkpoint/Restart options:
    -ckpoint-interval                checkpoint interval
    -ckpoint-prefix                  checkpoint file prefix
    -ckpoint-num                     checkpoint number to restart
    -ckpointlib                      checkpointing library (none)

  Demux engine options:
    -demux                           demux engine (poll select)

  Other Hydra options:
    -verbose                         verbose mode
    -info                            build information
    -print-rank-map                  print rank mapping
    -print-all-exitcodes             print exit codes of all processes
    -iface                           network interface to use
    -ppn                             processes per node
    -profile                         turn on internal profiling
    -prepend-rank                    prepend rank to output
    -nameserver                      name server information (host:port format)
    -disable-auto-cleanup            don't cleanup processes on error