12:23 a.m.
I am currently using optaplanner 6.0.0.CR5, I have about 11000 planning
entity objects and about 1000 planning variable objects. Would that be the
cause of this problem?
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3:59 a.m.
On 19-11-13 07:23, newbie wrote:
I am currently using optaplanner 6.0.0.CR5, I have about 11000
planning
entity objects and about 1000 planning variable objects. Would that be the
cause of this problem?
By default, OptaPlanner uses selectors with cacheType=JIT,
which can
handle 50K entities with 5k values.
If you specifically specify cacheType=STEP|PHASE or use a custom
MoveListFactory, look into using JIT or MoveIteratorFactory instead.
If that's not the case, what score calculation are you using?
What's the stacktrace?
Use a tool like VisualVM to find out what is causing the problem. See
this comment:
https://plus.google.com/+GeoffreyDeSmet/posts/fVAXfXXKB7n
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5:04 a.m.
Here's the stacktrace:
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at
org.drools.core.base.accumulators.JavaAccumulatorFunctionExecutor.createContext(JavaAccumulatorFunctionExecutor.java:81)
at org.drools.core.rule.Accumulate.createContext(Accumulate.java:126)
at
org.drools.core.phreak.PhreakAccumulateNode.doLeftInserts(PhreakAccumulateNode.java:145)
at
org.drools.core.phreak.PhreakAccumulateNode.doNode(PhreakAccumulateNode.java:81)
at
org.drools.core.phreak.RuleNetworkEvaluator.switchOnDoBetaNode(RuleNetworkEvaluator.java:562)
at
org.drools.core.phreak.RuleNetworkEvaluator.evalBetaNode(RuleNetworkEvaluator.java:533)
at
org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:335)
at
org.drools.core.phreak.RuleNetworkEvaluator.outerEval(RuleNetworkEvaluator.java:162)
at
org.drools.core.phreak.RuleNetworkEvaluator.evaluateNetwork(RuleNetworkEvaluator.java:117)
at
org.drools.core.phreak.RuleExecutor.reEvaluateNetwork(RuleExecutor.java:199)
at
org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:66)
at
org.drools.core.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:927)
at
org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1187)
at
org.drools.core.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:957)
at
org.drools.core.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:931)
at
org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:233)
at
org.optaplanner.core.impl.score.director.drools.DroolsScoreDirector.calculateScore(DroolsScoreDirector.java:98)
at
org.optaplanner.core.impl.solver.scope.DefaultSolverScope.calculateScore(DefaultSolverScope.java:101)
at
org.optaplanner.core.impl.bestsolution.BestSolutionRecaller.solvingStarted(BestSolutionRecaller.java:58)
at
org.optaplanner.core.impl.solver.DefaultSolver.solvingStarted(DefaultSolver.java:177)
at
org.optaplanner.core.impl.solver.DefaultSolver.solve(DefaultSolver.java:154)
I am not using custom movelistfactory. I am using drools score calculation.
Using visualvm I get this output. Thanks.
test.png <http://drools.46999.n3.nabble.com/file/n4026831/test.png>
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6:48 a.m.
New subject: Java Heap Space Out of Memory in Drools
On 19-11-13 12:04, newbie wrote:
Here's the stacktrace:
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at
org.drools.core.base.accumulators.JavaAccumulatorFunctionExecutor.createContext(JavaAccumulatorFunctionExecutor.java:81)
at org.drools.core.rule.Accumulate.createContext(Accumulate.java:126)
at
org.drools.core.phreak.PhreakAccumulateNode.doLeftInserts(PhreakAccumulateNode.java:145)
...
Using visualvm I get this output. Thanks.
test.png <http://drools.46999.n3.nabble.com/file/n4026831/test.png>
It
clearly at least one of your score rules in Drools that apparently
takes the grand majority of your memory (FromNodeLeftTuptle).
First identify the problematic score rules:
For each of your score rules, comment out that 1 score rule, let
planner run and check VisualVM.
Then report the problematic score rules here.
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6:26 p.m.
New subject: Java Heap Space Out of Memory in Drools
I have figured it out that this rule is the reason for the out of memory
error. Basically it counts the number of months assigned to a resource per
requirement and it should be a minimum of 3 months.
rule "minimumMonths"
when
$requirement : Requirement()
$employee: Employee()
$totalAssigned: Number(intValue > 0 && < 3) from accumulate(
$assignment : Assignment (
employee!= null,
employee== $employee,
requirement == $requirement
), count($assignment)
)
then
scoreHolder.addHardConstraintMatch(kcontext, 0, -1);
end
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12:43 a.m.
New subject: Java Heap Space Out of Memory in Drools
That doesn't look so bad.
How many Requirements, Employees and Assignments do you have?
On 20-11-13 01:26, newbie wrote:
I have figured it out that this rule is the reason for the out of
memory
error. Basically it counts the number of months assigned to a resource per
requirement and it should be a minimum of 3 months.
rule "minimumMonths"
when
$requirement : Requirement()
$employee: Employee()
$totalAssigned: Number(intValue > 0 && < 3) from accumulate(
$assignment : Assignment (
employee!= null,
employee== $employee,
requirement == $requirement
), count($assignment)
)
then
scoreHolder.addHardConstraintMatch(kcontext, 0, -1);
end
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1:41 a.m.
New subject: Java Heap Space Out of Memory in Drools
My example was I have 1000 employees and 1000 requirement. Each requirement
has duration of 10 months. The number of assignment therefore would be
number of months of requirment * number of requirement all in all 10000
assignments.
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3:47 a.m.
New subject: Java Heap Space Out of Memory in Drools
The rule starts by pairing each Employee with each Requirement and
so you have 1000*1000 = 1000000 nodes in the network. This is an
anti-pattern for counting pairs from a subset (1%) of all pairs.
To count Assignments with identical pairs of Employee and Requirements
you just look at Assignments. Ideally, Assignments has an attribute
that enumerates them (or some other unique comparable id - a simple
object counter will do). Then you start the rule with
Assignment( $e: employee, $r: requirement, $id: id)
not Assignment( employee == $e, requirement == $r, id < $id )
...accumulate...
Best
-W
On 20/11/2013, newbie <dspecialist18(a)yahoo.com> wrote:
My example was I have 1000 employees and 1000 requirement. Each
requirement
has duration of 10 months. The number of assignment therefore would be
number of months of requirment * number of requirement all in all 10000
assignments.
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7 comments
3 participants
participants (3)
-
Geoffrey De Smet -
newbie -
Wolfgang Laun