Essay heading: 4quadrant HP-UX memory issue
Essay specific features
November 27, 2001
No of pages / words:
20 / 5400
Rating of current essay:
Quadrant one and two exists n times (once for each process). All shared objects are
mapped to quadrant 3 and 4 (and quad 2 for SHMEM_MAGIC) of one single space shared by all processes.
This is where the system wide limit of 1.75 Gb's comes from. Each quadrant is 1gigabyte in size.
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EXEC_MAGIC and SHMEM_MAGIC
require special binaries.
If no special options are given to the compiler/linker, the default executable format is SHARE_MAGIC. Text
is shared for all copies running on the system and data is private. EXEC_MAGIC is the output of using the
-N option to the linker. It results in the data starting immediately after the text allowing for a greater sized
data space (approximately 1...
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