Bug 676306

Summary:	Concurrency limit with parallel universe
Product:	Red Hat Enterprise MRG	Reporter:	Lubos Trilety <ltrilety>
Component:	Grid_User_Guide	Assignee:	Alison Young <alyoung>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Lubos Trilety <ltrilety>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	beta	CC:	matt
Target Milestone:	2.0
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-06-24 01:22:11 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:

Description Lubos Trilety 2011-02-09 12:49:51 UTC

Description of problem:
There is no mentioned that value of concurrency limit can be a floating point number in Grid User Guide.
Moreover there should be some notice that limits are summed from each slot running a job. That means a parallel universe job will count the limits for each slot claimed with the machine_count. E.g. machine_count = 4, concurrency_limits=license:0.25 will give the job cluster a single license.

Additional info:
see bug 618959

Comment 1 Alison Young 2011-03-01 08:21:56 UTC

Changes made in revision 0.1-1, build: Red_Hat_Enterprise_MRG-Grid_User_Guide-2.0-web-en-US-0.1-1.el5

Code snippets:

<para>
	Concurrency limits are set when a job is submitted, by specifying the <command>concurrency_limits</command> parameter in the job submit file. The <command>concurrency_limits</command> parameter references a value in the configuration file. The value of the <command>concurrency_limits</command> parameter can be a floating point number and a job submit file can also reference more than one limit.
</para>


<important>
<para>
	Limits are summed from each slot running a job. For example, a parallel universe job will count the limits for each slot claimed with <command>machine_count</command>. The following example gives the job cluster a single license.
</para>
<programlisting>
machine_count = 4, concurrency_limits=license:0.25
</programlisting>
</important>

Comment 2 Lubos Trilety 2011-05-26 10:02:42 UTC

Chapter 14. Concurrency Limits checked, additional info about concurrency limits added.

>>> VERIFIED