7.12.15 -XX:HitachiExplicitMemoryLogLevel

Description

-XX:HitachiExplicitMemoryLogLevel specifies the event log level for the explicit memory management functionality.

Prerequisite option

• -XX:+HitachiUseExplicitMemory

Syntax

-XX:HitachiExplicitMemoryLogLevel:applicable_range

Specifiable values

applicable_range

Type: String

none

Does not output the event log for the explicit memory management functionality.

normal

To be specified during normal operation. The status of the explicit heap is output periodically (each time GC occurs). In addition, the status is output when an event occurs that significantly changes the status of the Explicit heap.

verbose

In addition to the output times for normal described above, the status of the Explicit heap is output when an event occurs that changes the status of the Explicit heap. The amount of output log data when verbose is specified is greater than the amount of data when normal is specified.

debug

In addition to the output times for verbose, detailed information is output when certain events occur. Performance is significantly degraded, because a large amount of log data is output.

Default value

If the definition item is omitted:

-XX:HitachiExplicitMemoryLogLevel:none

Notes

If you specify a value other than none, normal, verbose, and debug, the following message is output to the standard output and the Java VM terminates with the return code 1.

Invalid explicit heap log level:  -XX:HitachiExplicitMemoryLogLevel:applicable_range
Could not create the Java virtual machine.
(log levels: none normal verbose debug)