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https://issues.apache.org/jira/browse/LUCENENET-425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13049322#comment-13049322
]
Digy commented on LUCENENET-425:
--------------------------------
I would like to compare search speeds of "FSDirectory" and "MMapDirectory" (if
possible, with a big index)
1- IndexReader.Open( FSDirectory.Open(new System.IO.FileInfo(INDEX)) ,true );
2- IndexReader.Open( new MMapDirectory(new System.IO.FileInfo(INDEX)) ,true );
Something like
{code}
public class TestSearchSpeed
{
string INDEX = @"Path to Index"; //
string[] _words = new string[]{"","","","","","","","",""}; //Some
words to search
Directory _dir;
public long TestFSDir()
{
_dir = FSDirectory.Open(new System.IO.FileInfo(INDEX));
return Test();
}
public long TestMMapDir()
{
_dir = new MMapDirectory(new System.IO.FileInfo(INDEX));
return Test();
}
long Test()
{
IndexReader reader = IndexReader.Open(_dir, true);
Search(reader, "sometext");
Stopwatch sw = new Stopwatch();
sw.Start();
for (int i = 0; i < 5; i++)
{
Parallel.For(0, 50, j =>
{
Search(reader, _words[j % _words.Length]);
}
);
}
long dur = sw.ElapsedMilliseconds;
sw.Stop();
reader.Close();
return dur;
}
void Search(IndexReader reader,string criteria)
{
IndexSearcher src = new IndexSearcher(reader);
Query q = new QueryParser("field", new
WhitespaceAnalyzer()).Parse(criteria);
TopDocs hits = src.Search(q, 100);
for (int i = 0; i < hits.ScoreDocs.Length; i++)
{
Document doc = reader.Document(hits.ScoreDocs[i].doc);
string s = doc.GetField("field").StringValue();
}
}
}
{code}
DIGY
> MMapDirectory implementation
> ----------------------------
>
> Key: LUCENENET-425
> URL: https://issues.apache.org/jira/browse/LUCENENET-425
> Project: Lucene.Net
> Issue Type: New Feature
> Affects Versions: Lucene.Net 2.9.4g
> Reporter: Digy
> Priority: Trivial
> Fix For: Lucene.Net 2.9.4g
>
> Attachments: MMapDirectory.patch
>
>
> Since this is not a direct port of MMapDirectory.java, I'll put it under
> "Support" and implement MMapDirectory as
> {code}
> public class MMapDirectory:Lucene.Net.Support.MemoryMappedDirectory
> {
> }
> {code}
> If a Mem-Map can not be created(for ex, if the file is too big to fit in 32
> bit address range), it will default to FSDirectory.FSIndexInput
> In my tests, I didn't see any performance gain in 32bit environment and I
> consider it as better then nothing.
> I would be happy if someone could send test results on 64bit platform.
> DIGY
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