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

Synopsis

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

Description

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.

Options

-help

Display usage information and exit

-m

Only search for entire machines. Virtual machines 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.

Examples

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 kflops attribute is not defined:

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

Author

Condor Team, University of Wisconsin-Madison

Copyright

Copyright © 1990-2006 Condor Team, Computer Sciences Department, University of Wisconsin-Madison, Madison, WI. All Rights Reserved. No use of the Condor Software Program is authorized without the express consent of the Condor Team. For more information contact: Condor Team, Attention: Professor Miron Livny, 7367 Computer Sciences, 1210 W. Dayton St., Madison, WI 53706-1685, (608) 262-0856 or miron@cs.wisc.edu.

U.S. Government Rights Restrictions: Use, duplication, or disclosure by the U.S. Government is subject to restrictions as set forth in subparagraph (c)(1)(ii) of The Rights in Technical Data and Computer Software clause at DFARS 252.227-7013 or subparagraphs (c)(1) and (2) of Commercial Computer Software-Restricted Rights at 48 CFR 52.227-19, as applicable, Condor Team, Attention: Professor Miron Livny, 7367 Computer Sciences, 1210 W. Dayton St., Madison, WI 53706-1685, (608) 262-0856 or miron@cs.wisc.edu.

See the Condor Version 6.8.3 Manual for additional notices.