Essay heading: 4quadrant HP-UX memory issue

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November 27, 2001






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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. Program Text 1 Gigabyte (quadrant 1) Program Data 1 Gigabyte (quadrant 2) Global Space 1 Gigabyte (quadrant 3) Global Space ...
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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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