7.11.3 Points to be considered when using the memory saving functionality of the Explicit heap that is used in an HTTP session
This section describes the points to be considered when using the memory saving functionality of the Explicit heap that is used in an HTTP session.
Output contents of statistics file partly differ depending on whether you are using the memory saving functionality of the Explicit heap that is used in an HTTP session.
- Reference note
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Due to the differences described here, the area that allocates the memory size of the objects related to an HTTP session, that is to be stored in the Explicit memory block to be released, changes from an area used in an HTTP session to an area used in the application. However, the memory size used by the entire system does not change. Therefore, whether you use this functionality does not impact the estimation of the memory size of the Explicit heap area performed using statistics.
This subsection describes the differences in the output contents.
- Organization of this subsection
(1) Number of Explicit memory blocks obtained by an HTTP session
The number of Explicit memory blocks output in the following items differs:
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HTTPSessionEMemoryBlockCount.HighWaterMark
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HTTPSessionEMemoryBlockCount.LowWaterMark
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HTTPSessionEMemoryBlockCount.Current
- If you are not using this functionality
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The number of active HTTP sessions in the system is output.
- If you are using this functionality
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Because a value reflecting an internal operation is output, the value output is different than the number of active HTTP sessions in the system.
(2) Size of the Explicit heap area used in the application
The size of the Explicit heap area output in the following items differs:
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ApplicationEHeapSize.HighWaterMark
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ApplicationEHeapSize.LowWaterMark
- If you are not using this functionality
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The size of Explicit memory used in the automatic placement functionality is output.
- If you are using this functionality
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The total of "size of Explicit memory that is targeted for automatic release by this functionality + size of Explicit memory used in the automatic placement functionality" is output.