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       condor_findhost  -  find  machine(s)  in the pool that can be used with
       minimal impact on currently running  Condor  jobs  and  best  meet  any
       specified constraints


       condor_findhost [ -help ] [ -m ] [ -n num ] [ -c c_expr ] [ -r r_expr ]
       [ -p centralmanagerhostname ]


       condor_findhost searches a Condor pool of machines for the best machine
       or machines that will have the minimum impact on running Condor jobs if
       the machine or machines are taken out of the pool. The  search  may  be
       limited  to the machine or machines that match a set of constraints and
       rank expression.

       condor_findhost returns a fully-qualified domain name for each machine.
       The search is limited (constrained) to a specific set of machines using
       the -c option. The search can use the -r option for rank, the criterion
       used for selecting a machine or machines from the constrained list.



          Display usage information and exit


          Only  search for entire machines. Slots within an entire machine are
          not considered.

       -n num

          Find and list up to num machines  that  fulfill  the  specification.
          num is an integer greater than zero.

       -c c_expr

          Constrain  the search to only consider machines that result from the
          evaluation of c_expr .  c_expr is a ClassAd expression.

       -r r_expr

          r_expr is the rank expression  evaluated  to  use  as  a  basis  for
          machine selection.  r_expr is a ClassAd expression.

       -p centralmanagerhostname

          Specify the pool to be searched by giving the central manager’s host
          name. Without this option, the current pool is searched.

General Remarks

       condor_findhost is used to locate a machine within a pool that  can  be
       taken out of the pool with the least disturbance of the pool.

       An  administrator  should  set  preemption  requirements for the Condor
       pool. The expression

       (Interactive =?= TRUE )

       will let condor_findhost know that it  can  claim  a  machine  even  if
       Condor would not normally preempt a job running on that machine.

Exit Status

       The  exit  status of condor_findhost is zero on success. If not able to
       identify as many machines as requested, it returns one  more  than  the
       number   of  machines  identified.  For  example,  if  8  machines  are
       requested, and condor_findhost only locates 6, the exit status will  be
       7.  If  not  able  to  locate any machines, or an error is encountered,
       condor_findhost will return the value 1.


       To find and list four machines, preferring those with the highest  mips
       (on Drystone benchmark) rating:

       condor_findhost -n 4 -r "mips"

       To  find  and  list  24  machines,  considering  only  those  where the
       kflopsattribute is not defined:

       condor_findhost -n 24 -c "kflops=?=undefined"


       Condor Team, University of Wisconsin-Madison


       Copyright (C) 1990-2009  Condor  Team,  Computer  Sciences  Department,
       University  of  Wisconsin-Madison,  Madison,  WI.  All Rights Reserved.
       Licensed under the Apache License, Version 2.0.

       See      the      Condor      Version       7.2.4       Manual       or additional notices.

                                     date    just-man-pages/condor_findhost(1)