/**
* 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.
*/
package com.alibaba.jstorm.oversold;
import com.alibaba.jstorm.client.ConfigExtension;
import java.util.Map;
/**
* @author fengjian
* @since 16/11/14
*/
public class GcStrategyManager {
public static GcStrategy getGcStrategy(Map conf) {
double memWeight = ConfigExtension.getSupervisorSlotsPortMemWeight(conf);
if (memWeight >= 1) memWeight = 1;
else if (memWeight <= 0.5) memWeight = 0.5;
GcStrategy gcStrategy = new GcStrategy();
gcStrategy.setGcType(GC.ConcMarkSweepGC);
gcStrategy.setInitiatingOccupancyFraction(memWeight * 0.68);
gcStrategy.setUseInitiatingOccupancyOnly(true);
gcStrategy.setSurvivorRatio(4);
return gcStrategy;
}
}