Re: [mat-dev] MAT1.12 : OutOfMemoryError: Requested length of new long[2

[Jason Koch <jkoch@xxxxxxxxxxx>]

Hi Nikhil,

This will happen when there are too many objects in the hprof file (2^^31). To process a heap file with this many objects, you'll need to set up MAT preferences to allow object discard. Go to Window > Preferences > Memory Analyzer > Enable discard to turn it on and set a % of objects that will be skipped, this should be enough to bring you below the limit, however beware that analysis results are only approximate after objects are discarded during processing.

Andrew - FYI, I have submitted a wiki edit to add this error to the FAQ, and it is in the moderation queue now.

Thanks

Jason

On Thu, Nov 25, 2021 at 6:40 AM Nikhil Dongre <nikhil.vilas@xxxxxxxxx> wrote:

./ParseHeapDump.sh test.hprof 

Task: Parsing test.hprof

[Task: Parsing test.hprof

[

Subtask: Scanning test.hprof

[...........]

!SESSION 2021-11-25 14:25:21.690 -----------------------------------------------

eclipse.buildId=unknown

java.version=11.0.12

java.vendor=Red Hat, Inc.

BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US

Framework arguments:  -application org.eclipse.mat.api.parse  test.hprof

Command-line arguments:  -os linux -ws gtk -arch x86_64 -consolelog -application org.eclipse.mat.api.parse test.hprof

!ENTRY org.eclipse.osgi 4 0 2021-11-25 14:31:53.418

!MESSAGE Application error

!STACK 1

java.lang.OutOfMemoryError: Requested length of new long[2,147,483,640] exceeds limit of 2,147,483,639.

Consider enabling object discard, see Window > Preferences > Memory Analyzer > Enable discard

at org.eclipse.mat.parser.index.IndexWriter$Identifier.add(IndexWriter.java:102)

at org.eclipse.mat.hprof.HprofParserHandlerImpl.reportInstance(HprofParserHandlerImpl.java:1032)

at org.eclipse.mat.hprof.HprofParserHandlerImpl.reportInstanceOfPrimitiveArray(HprofParserHandlerImpl.java:1069)

at org.eclipse.mat.hprof.Pass1Parser.readPrimitiveArrayDump(Pass1Parser.java:823)

at org.eclipse.mat.hprof.Pass1Parser.readDumpSegments(Pass1Parser.java:448)

at org.eclipse.mat.hprof.Pass1Parser.read(Pass1Parser.java:213)

at org.eclipse.mat.hprof.HprofIndexBuilder.fill(HprofIndexBuilder.java:84)

at org.eclipse.mat.parser.internal.SnapshotFactoryImpl.parse(SnapshotFactoryImpl.java:331)

at org.eclipse.mat.parser.internal.SnapshotFactoryImpl.openSnapshot(SnapshotFactoryImpl.java:202)

at org.eclipse.mat.snapshot.SnapshotFactory.openSnapshot(SnapshotFactory.java:149)

at org.eclipse.mat.internal.apps.ParseSnapshotApp.parse(ParseSnapshotApp.java:140)

at org.eclipse.mat.internal.apps.ParseSnapshotApp.start(ParseSnapshotApp.java:112)

at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)

at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)

at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)

at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:401)

at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)

at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.base/java.lang.reflect.Method.invoke(Method.java:566)

at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:654)

at org.eclipse.equinox.launcher.Main.basicRun(Main.java:591)

at org.eclipse.equinox.launcher.Main.run(Main.java:1462)

at org.eclipse.equinox.launcher.Main.main(Main.java:1435)

(process:11392): Gtk-WARNING **: 14:31:55.647: Locale not supported by C library.

Using the fallback 'C' locale.

MemoryAnalyzer: Cannot open display: 

MemoryAnalyzer:

An error has occurred. See the log file

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