Java Memory Management on HP-UX

page 42/8/2005

Type of Executables on HP-UX

• SHARE_MAGIC is the default on 11.0. SHARE_MAGIC is also

called DEMAND_MAGIC. With SHARE_MAGIC, quadrant 1 is

used for program text, quadrant 2 is used for program data,

and quadrants 3 and 4 are for shared items.

• EXEC_MAGIC allows a greater process data space by allowing

text and data to share quadrant 1. Quadrant 2 is still solely

used for data, and quadrants 3 and 4 are also the same as with

SHARE_MAGIC executables. EXEC_MAGIC applications are

created by linking the application with the -N option.

• SHMEM_MAGIC makes 2.75 GB of shared memory available to

an application. With SHMEM_MAGIC all of the text and data is

in quadrant 1 freeing up quadrant 2 for shared items. The

SHMEM_MAGIC processes on the system will share quadrant 2

for shared memory, as well as sharing quadrants 3 and 4 with

other processes on the system.