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<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
<UL CLASS="ChildLinks">
<LI><A NAME="tex2html3508"
HREF="condor_findhost.html#SECTION0011181000000000000000">Synopsis</A>
<LI><A NAME="tex2html3509"
HREF="condor_findhost.html#SECTION0011182000000000000000">Description</A>
<LI><A NAME="tex2html3510"
HREF="condor_findhost.html#SECTION0011183000000000000000">Options</A>
<LI><A NAME="tex2html3511"
HREF="condor_findhost.html#SECTION0011184000000000000000">General Remarks</A>
<LI><A NAME="tex2html3512"
HREF="condor_findhost.html#SECTION0011185000000000000000">Exit Status</A>
<LI><A NAME="tex2html3513"
HREF="condor_findhost.html#SECTION0011186000000000000000">Examples</A>
<LI><A NAME="tex2html3514"
HREF="condor_findhost.html#SECTION0011187000000000000000">Author</A>
<LI><A NAME="tex2html3515"
HREF="condor_findhost.html#SECTION0011188000000000000000">Copyright</A>
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<HR>
<H1><A NAME="SECTION0011180000000000000000"></A><A NAME="man-condor-findhost"></A>
<BR>
<SPAN CLASS="textit">condor_findhost</SPAN>
</H1> find machine(s) in the pool that
can be used with minimal impact on currently running Condor jobs
and best meet any specified constraints
<P>
<H2><A NAME="SECTION0011181000000000000000">
Synopsis</A>
</H2><SPAN CLASS="textbf"><SPAN CLASS="textit">condor_findhost</SPAN></SPAN>
[<SPAN CLASS="textbf">-help</SPAN>]
[<SPAN CLASS="textbf">-m</SPAN>]
[<SPAN CLASS="textbf">-n </SPAN><SPAN CLASS="textit">num</SPAN>]
[<SPAN CLASS="textbf">-c </SPAN><SPAN CLASS="textit">c_expr</SPAN>]
[<SPAN CLASS="textbf">-r </SPAN><SPAN CLASS="textit">r_expr</SPAN>]
[<SPAN CLASS="textbf">-p </SPAN><SPAN CLASS="textit">centralmanagerhostname</SPAN>]
<P>
<A NAME="65392"></A>
<A NAME="65393"></A>
<P>
<H2><A NAME="SECTION0011182000000000000000">
Description</A>
</H2>
<P>
<SPAN CLASS="textit">condor_findhost</SPAN> 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.
<P>
<SPAN CLASS="textit">condor_findhost</SPAN>
returns a fully-qualified domain name for each machine.
The search is limited (constrained) to a specific set of machines
using the <SPAN CLASS="textit">-c</SPAN> option.
The search can use the <SPAN CLASS="textit">-r</SPAN> option for rank,
the criterion used for selecting a machine or machines from the
constrained list.
<P>
<H2><A NAME="SECTION0011183000000000000000">
Options</A>
</H2>
<P>
<DL>
<DT><STRONG><SPAN CLASS="textbf">-help</SPAN></STRONG></DT>
<DD>Display usage information and exit
<BR>
</DD>
<DT><STRONG><SPAN CLASS="textbf">-m</SPAN></STRONG></DT>
<DD>Only search for entire machines.
Slots within an entire machine are not considered.
<BR>
</DD>
<DT><STRONG><SPAN CLASS="textbf">-n </SPAN><SPAN CLASS="textit">num</SPAN></STRONG></DT>
<DD>Find and list up to <SPAN CLASS="textit">num</SPAN> machines that
fulfill the specification. <SPAN CLASS="textit">num</SPAN> is an integer greater than zero.
<BR>
</DD>
<DT><STRONG><SPAN CLASS="textbf">-c </SPAN><SPAN CLASS="textit">c_expr</SPAN></STRONG></DT>
<DD>Constrain the search to only consider
machines that result from the evaluation of <SPAN CLASS="textit">c_expr</SPAN>.
<SPAN CLASS="textit">c_expr</SPAN> is a ClassAd expression.
<BR>
</DD>
<DT><STRONG><SPAN CLASS="textbf">-r </SPAN><SPAN CLASS="textit">r_expr</SPAN></STRONG></DT>
<DD><SPAN CLASS="textit">r_expr</SPAN> is the rank expression
evaluated to use as a basis for machine selection.
<SPAN CLASS="textit">r_expr</SPAN> is a ClassAd expression.
<BR>
</DD>
<DT><STRONG><SPAN CLASS="textbf">-p </SPAN><SPAN CLASS="textit">centralmanagerhostname</SPAN></STRONG></DT>
<DD>Specify the pool to
be searched by giving the central manager's host name.
Without this option, the current pool is searched.
<BR>
</DD>
</DL>
<P>
<P>
<H2><A NAME="SECTION0011184000000000000000">
General Remarks</A>
</H2>
<P>
<SPAN CLASS="textit">condor_findhost</SPAN> is used to locate a machine
within a pool that can be taken out of the pool with the least
disturbance of the pool.
<P>
An administrator should set preemption requirements for
the Condor pool.
The expression
<PRE>
(Interactive =?= TRUE )
</PRE>
will let <SPAN CLASS="textit">condor_findhost</SPAN> know that it can claim a machine even
if Condor would not normally preempt a job running on that machine.
<P>
<H2><A NAME="SECTION0011185000000000000000">
Exit Status</A>
</H2>
<P>
The exit status of <SPAN CLASS="textit">condor_findhost</SPAN> 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 <SPAN CLASS="textit">condor_findhost</SPAN>
only locates 6, the exit status will be 7.
If not able to locate any machines, or an error is encountered,
<SPAN CLASS="textit">condor_findhost</SPAN> will return the value 1.
<P>
<H2><A NAME="SECTION0011186000000000000000">
Examples</A>
</H2>
To find and list four machines, preferring those with the highest
mips (on Drystone benchmark) rating:
<PRE>
condor_findhost -n 4 -r "mips"
</PRE>
To find and list 24 machines, considering only those
where the <TT>kflops</TT> attribute is not defined:
<PRE>
condor_findhost -n 24 -c "kflops=?=undefined"
</PRE>
<P>
<H2><A NAME="SECTION0011187000000000000000">
Author</A>
</H2> Condor Team, University of Wisconsin-Madison
<H2><A NAME="SECTION0011188000000000000000">
Copyright</A>
</H2>
Copyright © 1990-2012 Condor Team, Computer Sciences Department,
University of Wisconsin-Madison, Madison, WI. All Rights Reserved.
Licensed under the Apache License, Version 2.0.
<P>
See the <SPAN CLASS="textit">Condor Version 7.8.2 Manual</SPAN> or
<A NAME="tex2html378"
HREF="http://www.condorproject.org/license">http://www.condorproject.org/license</A>
for
additional notices.
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