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From "LI Guobao (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SYSTEMML-2382) Concurrent problem about LibMatrixMult
Date Mon, 11 Jun 2018 22:32:00 GMT
LI Guobao created SYSTEMML-2382:
-----------------------------------

             Summary: Concurrent problem about LibMatrixMult
                 Key: SYSTEMML-2382
                 URL: https://issues.apache.org/jira/browse/SYSTEMML-2382
             Project: SystemML
          Issue Type: Sub-task
            Reporter: LI Guobao
            Assignee: LI Guobao


When the worker number is set to 2 and each worker has 2 threads to launch its instruction,
in the case of small batchsize, the program fails with a concurrent error. But when I set
only 1 thread to each worker, it does not fail.

Here is the stack:
{code:java}
Caused by: org.apache.sysml.runtime.DMLRuntimeException: java.util.concurrent.ExecutionException:
java.lang.ArrayIndexOutOfBoundsException: 3
at org.apache.sysml.runtime.matrix.data.LibMatrixMult.matrixMult(LibMatrixMult.java:221)
at org.apache.sysml.runtime.matrix.data.MatrixBlock.aggregateBinaryOperations(MatrixBlock.java:4796)
at org.apache.sysml.runtime.instructions.cp.AggregateBinaryCPInstruction.processInstruction(AggregateBinaryCPInstruction.java:73)
at org.apache.sysml.runtime.controlprogram.ProgramBlock.executeSingleInstruction(ProgramBlock.java:252)
... 13 more
Caused by: java.util.concurrent.ExecutionException: java.lang.ArrayIndexOutOfBoundsException:
3
at java.util.concurrent.FutureTask.report(FutureTask.java:122)
at java.util.concurrent.FutureTask.get(FutureTask.java:192)
at org.apache.sysml.runtime.matrix.data.LibMatrixMult.matrixMult(LibMatrixMult.java:213)
... 16 more
Caused by: java.lang.ArrayIndexOutOfBoundsException: 3
at org.apache.sysml.runtime.matrix.data.LibMatrixMult.matrixMultSparseDenseMMShortLHS(LibMatrixMult.java:1305)
at org.apache.sysml.runtime.matrix.data.LibMatrixMult.matrixMultSparseDense(LibMatrixMult.java:1194)
at org.apache.sysml.runtime.matrix.data.LibMatrixMult.access$300(LibMatrixMult.java:57)
at org.apache.sysml.runtime.matrix.data.LibMatrixMult$MatrixMultTask.call(LibMatrixMult.java:3921)
... 5 more
{code}



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