Well, that code is when you're reading the fields of documents off disk. Stored fields are compressed/decompressed automatically.
So one question is what is your test doing? In other words, is it artificially hitting this? The theory is that this should only be done when you gather the final top N docs to return to the user (i.e. for each doc in the &rows= parameter if you were coming in from Solr). There's no simple configuration setting to turn off compression that I know of. Then again, at the Lucene level I'm pretty clueless. Erick On Tue, Aug 5, 2014 at 8:41 AM, d...@neusoft.com <d...@neusoft.com> wrote: > how to monitor? use jprofile? > > > > > > From: Sascha Janz > Date: 2014-08-05 22:36 > To: java-user@lucene.apache.org > Subject: Performance StringCoding.decode > hi, > > i want to speed up our search performance. so i run test and monitor them > with java mission control. > > 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) > > > -org.apache.lucene.codecs.compressing.CompressingStoredFieldsReader.readField(DataInput, > StoredFieldVisitor, FieldInfo, int) > > -org.apache.lucene.codecs.compressing.CompressingStoredFieldsReader.visitDocument(int, > StoredFieldVisitor) > -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 > > > regards > sascha > > --------------------------------------------------------------------- > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > For additional commands, e-mail: java-user-h...@lucene.apache.org > > > --------------------------------------------------------------------------------------------------- > Confidentiality Notice: The information contained in this e-mail and any > accompanying attachment(s) > is intended only for the use of the intended recipient and may be > confidential and/or privileged of > Neusoft Corporation, its subsidiaries and/or its affiliates. If any reader > of this communication is > not the intended recipient, unauthorized use, forwarding, printing, > storing, disclosure or copying > is strictly prohibited, and may be unlawful.If you have received this > communication in error,please > immediately notify the sender by return e-mail, and delete the original > message and all copies from > your system. Thank you. > > --------------------------------------------------------------------------------------------------- >
