The JVM has a hard limit on the size of the array. I’m assuming you are running
on a 32 bit os / JVM?
Clark Richey
clark.ric...@gmail.com
> On Sep 9, 2015, at 3:55 AM, 'Alex' via Neo4j <neo4j@googlegroups.com> wrote:
>
> Greetings,
>
> I am running Neo4j2.1.8 Embedded with Gremlin2.6.0. Mostly default
> configurations except for the heap (-Xms -Xmx parameters modified in the
> gremlin.sh file).
> I have about 120GB of RAM on my machine and I wanted to give it an -Xmx of
> about 110GB since I've read that Neo4j is heavily reliant on memory.
>
> As soon as I give it more than half (from -Xmx61G onwards) and try to
> instantiate I get the following error:
>
> gremlin> g = new Neo4j2Graph("/tmp/neo4j/");
> Requested array size exceeds VM limit
> Display stack trace? [yN] y
> java.lang.OutOfMemoryError: Requested array size exceeds VM limit
> at java.util.concurrent.atomic.
> AtomicReferenceArray.<init>(AtomicReferenceArray.java:94)
> at
> org.neo4j.kernel.impl.cache.HighPerformanceCache.<init>(HighPerformanceCache.java:100)
> at
> org.neo4j.kernel.impl.cache.HighPerformanceCacheProvider.newNodeCache(HighPerformanceCacheProvider.java:49)
> at org.neo4j.kernel.impl.core.DefaultCaches.node(DefaultCaches.java:51)
> at
> org.neo4j.kernel.InternalAbstractGraphDatabase.create(InternalAbstractGraphDatabase.java:573)
> at
> org.neo4j.kernel.InternalAbstractGraphDatabase.run(InternalAbstractGraphDatabase.java:339)
> at
> org.neo4j.kernel.EmbeddedGraphDatabase.<init>(EmbeddedGraphDatabase.java:59)
> at
> org.neo4j.graphdb.factory.GraphDatabaseFactory$1.newDatabase(GraphDatabaseFactory.java:91)
> at
> org.neo4j.graphdb.factory.GraphDatabaseBuilder.newGraphDatabase(GraphDatabaseBuilder.java:181)
> at
> com.tinkerpop.blueprints.impls.neo4j2.Neo4j2Graph.<init>(Neo4j2Graph.java:154)
> at
> com.tinkerpop.blueprints.impls.neo4j2.Neo4j2Graph.<init>(Neo4j2Graph.java:136)
> at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
> at
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
> at
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
> at
> org.codehaus.groovy.reflection.CachedConstructor.invoke(CachedConstructor.java:77)
> at
> org.codehaus.groovy.runtime.callsite.ConstructorSite$ConstructorSiteNoUnwrapNoCoerce.callConstructor(ConstructorSite.java:102)
> at
> org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallConstructor(CallSiteArray.java:54)
> at
> org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:182)
> at
> org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:190)
> at groovysh_evaluate.run(groovysh_evaluate:51)
> at groovysh_evaluate$run.call(Unknown Source)
> at
> org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:42)
> at
> org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
> at
> org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:112)
> at
> org.codehaus.groovy.tools.shell.Interpreter.evaluate(Interpreter.groovy:67)
> at org.codehaus.groovy.tools.shell.Interpreter$evaluate.call(Unknown
> Source)
> at
> org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:42)
> at
> org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
> at
> org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
> at org.codehaus.groovy.tools.shell.Groovysh.execute(Groovysh.groovy:152)
> at org.codehaus.groovy.tools.shell.Shell.leftShift(Shell.groovy:114)
>
> I'm curious to know why this happens. Are there any workarounds for this?
>
> Thank you all for your time,
> Alex
>
>
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