Attachment 677043 Details for Bug 892804 – Documentation update for how resources are split

[patch] Documentation update for how resources are split

DSlots.patch (text/plain), 2.05 KB, created by Timothy St. Clair on 2013-01-11 18:28:09 UTC

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Creator: Timothy St. Clair

Created: 2013-01-11 18:28:09 UTC

Size: 2.05 KB

patch

obsolete

>Index: en-US/Dynamic_Slots.xml
>===================================================================
>--- en-US/Dynamic_Slots.xml	(revision 88028)
>+++ en-US/Dynamic_Slots.xml	(working copy)
>@@ -250,5 +250,30 @@
> request_actuator = 1
> </programlisting>
> 	</example>
>+        
>+        <example id="exam-Grid_User_Guide-Dynamic_slots-Configuring_resource_partioning_sizes">
>+                <title>Configuring resource partitioning sizes</title>
>+                <para>
>+                    Once the job has been matched, and has made it to the execute machine, the condor_startd has the ability to modify these resource requests before using them to size the actual dynamic slots carved out of the partitionable slot. 
>+                    Clearly, for the job to work, the condor_startd daemon must create slots with at least as many resources as the job needs. 
>+                    However, it may be valuable to create dynamic slots somewhat bigger than the job's request, as subsequent jobs may be more likely to reuse the newly created slot when the initial job is done using it. 
>+                </para>
>+                <para>
>+                    The condor_startd configuration variables which control this and their defaults are:
>+                </para>
>+                
>+<programlisting>
>+MODIFY_REQUEST_EXPR_REQUESTCPUS = quantize(RequestCpus, {1})
>+MODIFY_REQUEST_EXPR_REQUESTMEMORY = quantize(RequestMemory, {256})
>+MODIFY_REQUEST_EXPR_REQUESTDISK = quantize(RequestDisk, {1024})
>+</programlisting>         
>+                <para>
>+                    The modify expressions use the quantize function which partitions to the the largest multiple greater then the request.
>+                    Therefore, in the case where a user were to set <command>RequestMemory=300</command> the dynamic slot created will have <command>SlotMemory=512</command>.
>+                    If the user desires legacy behavior they can set <command>MODIFY_REQUEST_EXPR_MEMORY=RequestMemory</command>, or likewise for the other attributes.
>+                </para>
>+
>+        </example>
>+        
> </chapter>

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