Github user synhershko commented on a diff in the pull request:
https://github.com/apache/lucenenet/pull/171#discussion_r62423483
--- Diff: src/Lucene.Net.Core/Index/TaskMergeScheduler.cs ---
@@ -0,0 +1,665 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading;
+
+namespace Lucene.Net.Index
+{
+ using Lucene.Net.Support;
+ using System.Linq;
+ using System.Threading.Tasks;
+ using Util;
+
+ /*
+ * Licensed to the Apache Software Foundation (ASF) under one or
more
+ * contributor license agreements. See the NOTICE file
distributed with
+ * this work for additional information regarding copyright
ownership.
+ * The ASF licenses this file to You under the Apache License,
Version 2.0
+ * (the "License"); you may not use this file except in compliance
with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
software
+ * distributed under the License is distributed on an "AS IS"
BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied.
+ * See the License for the specific language governing permissions
and
+ * limitations under the License.
+ */
+
+ using Directory = Lucene.Net.Store.Directory;
+
+ /// <summary>
+ /// A <seealso cref="MergeScheduler"/> that runs each merge using
+ /// Tasks on the default TaskScheduler.
+ ///
+ /// <p>If more than <seealso cref="#GetMaxMergeCount"/> merges are
+ /// requested then this class will forcefully throttle the
+ /// incoming threads by pausing until one more more merges
+ /// complete.</p>
+ /// </summary>
+ public class TaskMergeScheduler : MergeScheduler,
IConcurrentMergeScheduler
+ {
+ public const string COMPONENT_NAME = "CMS";
+
+ private readonly TaskScheduler _taskScheduler =
TaskScheduler.Default;
+ private readonly ReaderWriterLockSlim _lock = new
ReaderWriterLockSlim();
+ private readonly ManualResetEventSlim _manualResetEvent = new
ManualResetEventSlim();
+ /// <summary>
+ /// List of currently active <seealso
cref="MergeThread"/>s.</summary>
+ private readonly IList<MergeThread> _mergeThreads = new
List<MergeThread>();
--- End diff --
Will initializing the list size to _taskScheduler.MaximumConcurrencyLevel
help with performance in any way?
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