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https://issues.apache.org/jira/browse/SOLR-16549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17634190#comment-17634190
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Noble Paul commented on SOLR-16549:
-----------------------------------

I created a single node cluster and started creating collections . 

One missing ingredient is that we can't trigger a GC on a node before we 
actually get the memory used. So, I had to add a small {{@EndPoint}} to trigger 
a GC

> Solr core memory usage study
> ----------------------------
>
>                 Key: SOLR-16549
>                 URL: https://issues.apache.org/jira/browse/SOLR-16549
>             Project: Solr
>          Issue Type: Task
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Noble Paul
>            Priority: Major
>
> This is a ticket to study and compare memory usage of cores
> a simple tests reveals the following. The conclusion is that on an average a 
> Solr Core consumes ~30MB of memory for an empty index 
> {{cores    heap usage         }}
> {{----------------------    }}
> {{0      36,623,632    }}
> {{10     68,259,704    }}
> {{20     96,774,456    }}
> {{70     240,501,176    }}
> {{120    379,437,928    }}
> {{200    602,049,784    }}
> {{300    904,252,536    }}
> {{400    1,181,341,200    }}
> {{500    1,455,186,296   }}



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