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⟦cd22a4540⟧ Wang Wps File
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Types: Wang Wps File
Notes: CPS/REP/006
Names: »4836A «
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WangText
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SUMMARY REPORT OF CAMPS MEMORY SIZING
…02……02…CAMPS
T̲A̲B̲L̲E̲ ̲O̲F̲ ̲C̲O̲N̲T̲E̲N̲T̲S̲
1 INTRODUCTIONS ..................................
4
1.1 PURPOSE ....................................
4
1.2 BACKGROUND .................................
4
2 SIZING REPORT ..................................
5
2.1 CAUSES TO MEMORY GROWTH ....................
5
2.2 CURRENT MEMORY SIZING REQUIREMENTS .........
5
2.3 MEMORY SIZE REDUCTION ......................
6
2.4 MEMORY SIZE REQUIREMENT PER SITE ...........
7
1̲ ̲ ̲I̲N̲T̲R̲O̲D̲U̲C̲T̲I̲O̲N̲
As part of the continuously ongoing system verification
process, Christian Rovsing A/S has monitored the memory
size, as one of the system parameters. It is the latest
results of this effort, which is presented in this
summary report.
1.1 P̲U̲R̲P̲O̲S̲E̲
The purpose of this report it to explain the causes
of the increase in memory consumption, and to list
the needed number of memory-boards for the diffent
sites.
1.2 B̲A̲C̲K̲G̲R̲O̲U̲N̲D̲
The result contained in this report is based on a Christian
Rovsing internal technical note, which at a very detailed
level calculates the memory sizing figures.
This detailed analysis effort started on 2'nd April
1984 and was completed on 6'th April 1984.
The technical note has provided the visibility which
makes it possible to calculate the exact change in
size of memory, when the CAMPS configuration is changed
(e.g. connectivity).
2̲ ̲ ̲S̲I̲Z̲I̲N̲G̲ ̲R̲E̲P̲O̲R̲T̲
This chapter explains the causes for the increase in
memory size and presents the current memory sizing
figures.
2.1 C̲A̲U̲S̲E̲S̲ ̲T̲O̲ ̲M̲E̲M̲O̲R̲Y̲ ̲G̲R̲O̲W̲T̲H̲
The main reasons for the increase in memory sizing
requirements are:
a) A complex VDU screen oriented man-machine interface.
The VDU concept requires large buffers at a time,
complex handlers and additional tables.
b) A complex interrelationship between states and
sequences of events (primarily caused by the man-machine
interface) requires a large number of queues and
subqueues, which must be memory resident.
c) The three split design, which has been implemented
due to security, requires additional memory due
to a large number of logical devices.
d) Software design is emphasizing security and integrity
to a level, which is above the minimum specified
in the system requirement.
Point c and d are not required in the CAMPS systems
requirement but have been implemented by the objective
to design a multilevel secure system or at least getting
very close.
2.2 C̲U̲R̲R̲E̲N̲T̲ ̲M̲E̲M̲O̲R̲Y̲ ̲S̲I̲Z̲I̲N̲G̲ ̲R̲E̲Q̲U̲I̲R̲E̲M̲E̲N̲T̲S̲
Below is the current non-optimized memory allocation
presented for the In-plant Software Test Configuration:
a) F̲i̲x̲e̲d̲ ̲P̲r̲o̲g̲r̲a̲m̲ ̲a̲n̲d̲ ̲D̲a̲t̲a̲ ̲S̲i̲z̲e̲
System Processes
Handler
Queues 690 pages
Tables
Fixed Application processes: ̲3̲6̲8̲ ̲p̲a̲g̲e̲s̲
1058 pages
b) V̲a̲r̲i̲a̲b̲l̲e̲ ̲P̲r̲o̲g̲r̲a̲m̲ ̲a̲n̲d̲ ̲D̲a̲t̲a̲ ̲S̲i̲z̲e̲
Terminal Processes
Device Processes 808 pages
Channel Processes
c) A̲d̲d̲i̲t̲i̲o̲n̲a̲l̲
Test Tools 62 pages
This makes total memory consumption of 1928 pages (each
pages is 1 K word).
An analyze of the memory consumption shows that out
of the total of 1928 pages, the more complex man-machine
interface consumes 383 pages and the additional security
features consumes 220 pages, which gives a total of
603 pages allocated for those two purposes.
2.3 M̲E̲M̲O̲R̲Y̲ ̲S̲I̲Z̲E̲ ̲R̲E̲D̲U̲C̲T̲I̲O̲N̲
The following adjustments are planned and can be implemented
without negative side-effects:
Adjustment of Process Parameter Segments to the individual
needs per process type: 318 pages
Removal of Test Tools: 62 pages
This gives a total reduction of 380 pages.
The resulting memory sizing requirement for the In-plant
software test configuration is thus 1548 pages (each
page is 1 K word).
2.4 M̲E̲M̲O̲R̲Y̲ ̲S̲I̲Z̲E̲ ̲R̲E̲Q̲U̲I̲R̲E̲M̲E̲N̲T̲ ̲P̲E̲R̲ ̲S̲I̲T̲E̲
Based on the memory calculations described above and
the connectivity specified in CAMPS System Requirements,
Issue 3.15, 831219, page 237a, the memory requirements
for the different sites has been calculated.
This results in a required memory of three 512 KW RAM
Boards per PU per small site and four 512 KW RAM Boards
per PU per large site.
Small and large sites are specified in appendix A.
