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https://issues.apache.org/jira/browse/SOLR-4074?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13497193#comment-13497193
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Mark Miller commented on SOLR-4074:
-----------------------------------

bq. but app developers should always explicitly set it based on their 
application

My guess is that a large enough group of people take the defaults that it 
matters. App developers never do what they should :)
                
> We should default ramBufferSizeMB to around 100
> -----------------------------------------------
>
>                 Key: SOLR-4074
>                 URL: https://issues.apache.org/jira/browse/SOLR-4074
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Mark Miller
>            Assignee: Mark Miller
>            Priority: Minor
>             Fix For: 4.1, 5.0
>
>
> You get diminishing returns after 100, but gains up to 100. In this day and 
> age of RAM, it seems better to default to 100 and have essentially the top 
> indexing speed the buffer can give us.

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