Orange Micro RAMPAK 4GS - Manual (Page 18)

The Concept of Statistics
The RamPak 4GS Statistics Utility offers the user the
ability to view the efficiency of the current cache set-up
at any time. It will allow the user to view such items as the
number of reads, reads to cached blocks (also called a
HIT), the percentage of reads to hits (the cache
efficiency), the number of buffers allocated to any drive,
and how many writes to disk have occurred. And by
using the RESET STATISTICS COUNTER TO ZERO
feature under the SETTINGS menu along with MANUAL
CACHE ALLOCATION, the user can fine-tune the
operation of the system.
To use the Statistics Utility, the user should simply
boot the system, then go to the SETTINGS menu and
select STATISTICS. Then reset the statistic counters to
zero, run the application for a period of time, and return
to the SHOW STATISTICS dialog box under the FILE
menu to view the accumulated statistics. If the
percentage of reads to hits is low, then the cache size
should probably be increased. If the percentage of hits
to reads is close to 100%, you may wish to decrease the
cache size, especially if program memory is in short
supply. It is recommended that a minimum of 8 blocks
and a maximum of 64 blocks be allocated for each drive
to be cached. These selections can be made from the
MANUAL CACHE ALLOCATION dialog box, also in the
SETTINGS menu.
Manual Cache Allocation
This will open the Manual Cache Allocation dialog
box, from which you control the use of your installed
RAM. The upper portion of the box allows the setting of
up to sixteen disk caches, one for each of the possible
disk drives serving your Apple IIGS system. A box in the
upper left indicates the drive for which a cache is
currently being set (see in the diagram below). This
box should be displaying a value between SØD1 and
57D2. This indicates the slot and drive numbers of the
drive to be cached, as your Apple IIGS has eight logical
slot locations, each of which can address two drives. To
the immediate right of this box are up and down arrows
Using the mouse to click on these arrows enables
you to change the drive selection. Further to the right is
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