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LUCENE-2060: change CMS's default maxThreadCount from 3 to 1 

git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@836155 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Michael McCandless 2009-11-14 11:22:06 +00:00
parent 443d0093e9
commit 0a82d99eff
2 changed files with 8 additions and 1 deletions
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7
CHANGES.txt
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@ -40,6 +40,13 @@ Changes in runtime behavior
fields when reading. You have to reindex to do that. fields when reading. You have to reindex to do that.
(Michael Busch, Uwe Schindler) (Michael Busch, Uwe Schindler)
* LUCENE-2060: Chagned ConcurrentMergeScheduler's default for
maxNumThreads from 3 to 1, because in practice we get the most
gains from running a single merge in the backround. More than one
concurrent merge causes alot of thrashing (though it's possible on
SSD storage that there would be net gains). (Jason Rutherglen,
Mike McCandless)
API Changes API Changes
* LUCENE-1257, LUCENE-1984, LUCENE-1985, LUCENE-2057,...: Port to Java 1.5 * LUCENE-1257, LUCENE-1984, LUCENE-1985, LUCENE-2057,...: Port to Java 1.5

2
src/java/org/apache/lucene/index/ConcurrentMergeScheduler.java
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@ -39,7 +39,7 @@ public class ConcurrentMergeScheduler extends MergeScheduler {
protected List<MergeThread> mergeThreads = new ArrayList<MergeThread>(); protected List<MergeThread> mergeThreads = new ArrayList<MergeThread>();
// Max number of threads allowed to be merging at once // Max number of threads allowed to be merging at once
private int maxThreadCount = 3; private int maxThreadCount = 1;
protected Directory dir; protected Directory dir;