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https://issues.apache.org/jira/browse/FLINK-3206?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15110977#comment-15110977
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Maximilian Michels commented on FLINK-3206:
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Thanks for reporting :)
> Heap size for non-pre-allocated off-heap memory
> -----------------------------------------------
>
> Key: FLINK-3206
> URL: https://issues.apache.org/jira/browse/FLINK-3206
> Project: Flink
> Issue Type: Bug
> Components: Start-Stop Scripts
> Affects Versions: 1.0.0
> Reporter: Greg Hogan
> Assignee: Maximilian Michels
> Fix For: 1.0.0
>
>
> In {{taskmanager.sh}} the heap size is adjusted for off-heap memory only with
> pre-allocation set to true. In {{TaskManager.scala}} the computation is
> reversed to compute the {{directMemorySize}}. The effect is the JVM heap
> settings are too high and the assumed size of direct memory is also too high.
> {noformat}
> taskmanager.memory.fraction: 0.9
> taskmanager.memory.off-heap: true
> taskmanager.heap.mb: 18000
> {noformat}
> With {{taskmanager.memory.preallocate: false}}
> {noformat}
> 13:44:29,015 INFO org.apache.flink.runtime.taskmanager.TaskManager
> - -Xms18000M
> 13:44:29,015 INFO org.apache.flink.runtime.taskmanager.TaskManager
> - -Xmx18000M
> 13:44:30,591 INFO org.apache.flink.runtime.taskmanager.TaskManager
> - Limiting managed memory to 0.9 of the maximum memory size (161999 MB),
> memory will be allocated lazily.
> {noformat}
> With {{taskmanager.memory.preallocate: true}}
> {noformat}
> 13:53:44,127 INFO org.apache.flink.runtime.taskmanager.TaskManager
> - -Xms1800M
> 13:53:44,127 INFO org.apache.flink.runtime.taskmanager.TaskManager
> - -Xmx1800M
> 13:53:45,743 INFO org.apache.flink.runtime.taskmanager.TaskManager
> - Using 0.9 of the maximum memory size for managed off-heap memory (15524
> MB).
> {noformat}
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