Gregory Chanan created LUCENE-7115:
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Summary: 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
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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