condor_findhost - find machine(s) in the pool that can be used with
minimal impact on currently running Condor jobs and best meet any
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
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
Find and list up to num machines that fulfill the specification.
num is an integer greater than zero.
Constrain the search to only consider machines that result from the
evaluation of c_expr . c_expr is a ClassAd expression.
r_expr is the rank expression evaluated to use as a basis for
machine selection. r_expr is a ClassAd expression.
Specify the pool to be searched by giving the central manager’s host
name. Without this option, the current pool is searched.
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.
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
http://www.condorproject.org/licensefor additional notices.