ml.shifu.guagua.util.MemoryUtils Maven / Gradle / Ivy
/**
* Copyright [2013-2014] eBay Software Foundation
*
* Licensed 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 ml.shifu.guagua.util;
/**
* Helper static methods for tracking memory usage. Copy from Apache Giraph.
*/
public final class MemoryUtils {
/** Do not instantiate. */
private MemoryUtils() {
}
/**
* Get megabytes
*/
private static double megaBytes(long bytes) {
return bytes / 1024.0 / 1024.0;
}
/**
* Get total memory in megabytes
*
* @return total memory in megabytes
*/
public static double totalMemoryMB() {
return megaBytes(Runtime.getRuntime().totalMemory());
}
/**
* Get maximum memory in megabytes
*
* @return maximum memory in megabytes
*/
public static double maxMemoryMB() {
return megaBytes(Runtime.getRuntime().maxMemory());
}
/**
* Get free memory in megabytes
*
* @return free memory in megabytes
*/
public static double freeMemoryMB() {
return megaBytes(Runtime.getRuntime().freeMemory());
}
/**
* Get used memory in megabytes
*
* @return free memory in megabytes
*/
public static double usedMemoryMB() {
return megaBytes(Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory());
}
/**
* Get runtime memory stats
*
* @return String of all runtime stats.
*/
public static String getRuntimeMemoryStats() {
return String.format("Memory (free/used/total/max) = %.2fM / %.2fM / %.2fM / %.2fM", freeMemoryMB(),
usedMemoryMB(), totalMemoryMB(), maxMemoryMB());
}
}