Installation manual

107
System Tuning
F Section 10
Installing and Upgrading ENVOX r Configuration Software on DEC VAX and DEC AXP Systems (Revision B — May 1998)
minimum amount of physical memory that must be allocated to the
Sybase server to support a specific mix of concurrent ENVOX software,
Control Desktop, and Control Designer users which you specify.
Table 10-3 gives an approximate minimum amount of physical memory
that must be allocated to the Sybase server to support a given total
number of concurrent ENVOX software, Control Desktop, and Control
Designer users.
Table 10-3. Minimum Physical Memory Required
Number of Concurrent Users Minimum Sybase Server RAM
Required
3 16Mb
6 17Mb
10 19Mb
15 21Mb
20 23Mb
30 27Mb
Table 10-3 shows that sybase_tune requires a minimum of 16Mb RAM on
VAX and AXP, allocated to the Sybase server for a mix of one ENVOX
user, one Control Desktop user, and one Control Designer user (three
concurrent users). Similarly, three ENVOX users, two Control Desktop
users, and one Control Designer user (6 concurrent users) require a
minimum of 17Mb of RAM allocated to the Sybase server.
Allocating more than the minimum amount of memory to the Sybase
server normally improves system performance. A maximum of 50% of the
machine’s physical memory may be allocated to the Sybase server.
On a DEC VAX machine, the number of concurrent Control
Desktop and Control Designer users is limited by the load
imposed on the server machine. In practice, more than 7 Control
Desktop and 7 Control Designer users will give unacceptable
performance.
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