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From "Gus Heck (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-13446) Improve default heap size and related handling
Date Fri, 03 May 2019 22:35:00 GMT

    [ https://issues.apache.org/jira/browse/SOLR-13446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16832890#comment-16832890
] 

Gus Heck commented on SOLR-13446:
---------------------------------

Modern JVM default is 1/4 of system memory in most cases IIRC. Just let the JVM do it's thing? 

> Improve default heap size and related handling
> ----------------------------------------------
>
>                 Key: SOLR-13446
>                 URL: https://issues.apache.org/jira/browse/SOLR-13446
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: scripts and tools
>    Affects Versions: 8.0
>            Reporter: Shawn Heisey
>            Priority: Minor
>
> Solr's scripts have a default max heap setting of 512MB.  I think it's fair to say that
for a production install, this is ridiculously small.  Nearly everyone who runs a Solr server
will need to increase this value.
> I think it would be useful to issue a warning in the log when the heap size is below
a certain value.  Text like "Detected max heap size is XXXX.  It might be necessary to increase
the heap size for proper operation.  See https://lucene.apache.org/solr/path/to/ref/guide/location
for details."
> For people who are running very small servers, there should be a config option to turn
off that logging when somebody knows that the default heap size is perfectly fine for their
setup.
> At the same time, we also need to improve the default heap size.  I'm going to ask everyone
to bikeshed about what the new default should be.  Initial thought is a 2GB default, to be
made smaller automatically if detected system memory is low.  If the admin has explicitly
set the heap size, then none of this will take place.



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