home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Hall of Fame
/
HallofFameCDROM.cdr
/
other
/
sdnw1189.lzh
/
C1189Q
< prev
next >
Wrap
Text File
|
1989-11-28
|
3KB
|
71 lines
QUICKCACHE II v4.11 P.R.GLASSEL REGISTRATION $25.00
CACHE HARD DRIVE DISK GLASSEL
by
P. R. GLASSEL and ASSOCIATES, INC.
30255 Fir Trail, Stacy, MN 55079
U.S.A.
This product is an extension to the PC-DOS operating system
that sub- stantially improves the performance of the
operating system by adding an intelligent I/O subsystem
between the logical I/O layer and the physical I/O layer of
the computing system.
This process has the net effect of converting the operating
system's physical I/O requests into logical requests that
are serviced by the intelligent I/O subsystem. Actual
physical I/O requests are then made by the I/O subsystem
when necessary, and in the most efficient manner possible
for the current operating environment.
This is accomplished by three major facilities within the
QUICKCACHE I/O subsystem that cooperate to provide optimum
performance. The primary facility is the disk sector
caching facility.
This facility utilizes a hashing mechanism to reduce the
number of sectors in the cache that must be examined at I/O
time to a bare mini- mum. Under most circumstances the
number of sectors that must be examined will be three or
less regardless of the number of sector buffers that are
supported. This allows QUICKCACHE to support signifi-
cantly more sector buffers than PC-DOS is capable of
supporting without encountering any performance degradation.
QUICKCACHE uses a sophisticated and efficient algorithm that
accounts for the frequency of use as well as how recently a
sector buffer has been used to determine the optimum sector
buffer to flush whenever additional cache space is necessary
for a new sector.
In addition to providing an ultra-sophisticated caching
mechanism for managing sector buffers, QUICKCACHE provides a
read-ahead facility and a write-buffering facility that
allow physical I/O requests to be made in the most efficient
manner possible for the media being supported. Since the
system requirements for one program may be quite different
from the system requirements of another program, QUICKCACHE
allows ALL significant configuration options to be altered
DYNAMICALLY, eliminat- ing the need for re-booting your
system when it becomes desirable to change the operating
environment to suit the particular needs of a specific
program.
This extension requires no modification to any user programs
and works with the 2.xx, 3.xx, and 4.xx releases of PC-DOS
and most versions of MS-DOS.
It requires 10kb of memory for the actual I/O subsystem
code, and 530 bytes for each sector supported (a minimum of
40 is recommended). Memory for sector buffers may be
allocated from system main memory, extended memory, or from
any expanded memory that supports the Lotus/Intel/Microsoft
expanded memory specification.
This package also includes a high speed sort utility and a
disk backup utility. These utilities are designed to take
advantage of the disk caching system to produce impressive
performance for a wide range of environments.