IBM User Guide for Java V7 on Windows > Reference > Command-line options > JVM command-line options > -Xlp option

-Xlp:objectheap

Requests the JVM to allocate the Java™ object heap by using large page sizes.

-Xlp:objectheap:pagesize=<size> (AIX, Linux and Windows)

If the requested large page size is not available, the JVM starts, but the Java object heap is allocated using a platform-defined size. A warning is displayed when the requested page size is not available.

To obtain the large page sizes available and the current setting, use the -verbose:sizes option. Note the current settings are the requested sizes and not the sizes obtained. For object heap size information, check the -verbose:gc output.

For more information, see Configuring large page memory allocation.

All platforms: There is no error message issued when the operating system does not have sufficient resources to satisfy the request. This limitation and a workaround for verifying which page size is used can be found in Known issues and limitations.

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