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/**
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* Copyright (C) 2012 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.cdm.server;
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/**
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* @author a.kohlbecker
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* @date May 10, 2013
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*
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*/
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public class AssumedMemoryRequirements {
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// these values are best obtaines by using the following command sequence:
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// export JPID=$(jps | grep Jetty | awk '{ print $1}'); jcmd $JPID GC.run; sleep 1; jstat -gc $JPID | sed -e 's/ \+/\t/g'
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/*
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* From Java 8 on PermGen is replaced by the Metaspace
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*
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* Metaspace capacity:
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*
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* By default class metadata allocation is
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* limited by the amount of available native memory (capacity will
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* of course depend if you use a 32-bit JVM vs. 64-bit along with OS
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* virtual memory availability). A new flag is available
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* (MaxMetaspaceSize), allowing you to limit the amount of native
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* memory used for class metadata. If you don’t specify this flag,
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* the Metaspace will dynamically re-size depending of the
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* application demand at runtime.
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*/
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public static final int KB = 1024;
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public static final long MB = 1024 * KB;
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/**
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* 25% on to on the idle footprint
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*/
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private static final double FREE_HEAP = 1.25;
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/*
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* JAVA 7
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* based on the PC value of the jstat -gc output
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*/
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public static final long PERM_GEN_SPACE_PER_INSTANCE = 55 * MB;
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public static final long PERM_GEN_SPACE_CDMSERVER = 20 * MB;
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/*
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* based on the HU value of the jstat -gc output
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*/
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public static final long HEAP_PER_INSTANCE = (long)(153 * MB * FREE_HEAP);
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public static final long HEAP_CDMSERVER = (long) (15 * MB * FREE_HEAP);
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}
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