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From "Sascha Janz" <>
Subject Aw: Re: Performance StringCoding.decode
Date Wed, 06 Aug 2014 08:27:16 GMT
i used JMC ( Java Mission Control) from jdk7 u40+

see here

Gesendet: Dienstag, 05. August 2014 um 17:41 Uhr
Von: "" <>
An: "" <>
Betreff: Re: Performance StringCoding.decode
how to monitor? use jprofile?

From: Sascha Janz
Date: 2014-08-05 22:36
Subject: Performance StringCoding.decode

i want to speed up our search performance. so i run test and monitor them with java mission

the analysis showed that one hotspot is

sun.nio.cs.UTF_8$Decoder.decode(byte[], int, int, char[])
- java.lang.StringCoding.decode(Charset, byte[], int, int)
- java.lang.String.<init>(byte[], int, int, Charset)
StoredFieldVisitor, FieldInfo, int)
-org.apache.lucene.index.SegmentReader.document(int, StoredFieldVisitor)
-org.apache.lucene.index.IndexReader.document(int, Set)

we use jdk 1.7.55 and lucene 4.9.0.

is there a chance to speed this up? or do some changes in lucene IndexWriterConfig, e.g. use
an other codec?

we use the default values of IndexWriterConfig


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