[jira] [Resolved] (LUCENE-7115) Speed up FieldCache.CacheEntry toString by setting initial StringBuilder capacity

["Gregory Chanan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-7115?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gregory Chanan resolved LUCENE-7115.
------------------------------------
       Resolution: Fixed
    Fix Version/s: 6.1
                   trunk

Thanks for the review, Mark, committed to trunk and 6.1

> Speed up FieldCache.CacheEntry toString by setting initial StringBuilder capacity
> ---------------------------------------------------------------------------------
>
>                 Key: LUCENE-7115
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7115
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/search
>            Reporter: Gregory Chanan
>            Assignee: Gregory Chanan
>             Fix For: trunk, 6.1
>
>         Attachments: LUCENE-7115.patch
>
>
> Solr can end up printing a lot of these objects via the JmxMonitoriedMap, see SOLR-8869 and SOLR-6747 as examples.
> From looking at some profiles, a lot of time and memory are spent resizing the StringBuilder, which doesn't set the initial capacity.
> On my cluster, the strings are a bit over 200 chars; I set the initial capacity to 250 and ran tests calling toString 1000 times.  Tests consistently show 10-15% improvement when setting the initial capacity.



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