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Using extended common service area (ECSA) z/OS UNIX System Services Planning GA32-0884-00 |
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The extended common service area (ECSA) is a major storage area
above the 16 MB line, containing pageable system data areas addressable
by all active virtual address spaces. Use of ECSA is based on the
following formulas:
For example, if your system supports 200 dubbed address spaces, 500 processes, and 2000 threads, the kernel service consumes an additional 650KB of ECSA. In addition to this ECSA usage,
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