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Night Owl CD-ROM (NOPV9) (Night Owl Publisher) (1993).ISO
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CCT386.HLP
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1993-03-17
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CCT386 (c) F. PIETTE & CELEM COMPUTERS
CELEM CACHE TEST V2.0
─────────────────────
The Celem Cache Test has been developed to compare the performance of the
memory subsystem of PC compatible mainboards.
Specifically, Celem Cache Test shows the efficiency of the cache memory. The
diagram drawn by the test gives the thruput obtained by managing a constant
amount of memory spread in a memory space ranging from 1KB to 16MB (limited by
the physical memory). The CCT numbers shown are directly related to the
MB/Sec.
For a non-cache system, the time spent is independent of the memory space size
and depends on the CPU clock, bus width, processor type, memory organization
(page and interleave mode), refresh overhead and the number of wait-states.
For a cache system, the time spent is a function of the memory space size. If
the space fits into the cache, the time is very short. The time increases as
the space size overflows the cache. For large memory spaces (more than two
times the cache size) the time becomes constant. For a small memory space
size, the time depends mainly on the cache memory access time and the
performance of the cache controller.
Celem Cache Test indicates the CPU type, clock rate, and bus width. The clock
rate is based on the time required to do integer multiplications. The value
is given with an accuracy of ±0.5 MHz and is subject to small variations due
to system design.
Test are done in 16 and 32 bits. For true 32 bits, the results are quite
different, being almost twice as fast in 32 bits. For pseudo 32 bits machines
(for example Intel 386SX and Cyrix 486SLC), there is no much difference
between 16 and 32 bit. This is because on these machines 32 bits transfer are
actually done with two 16 bit memory accesses.
Note that version CCT386 is a 32 bit program, using a DOS extender. To use it,
you actually need at least a 386SX CPU with 1MB of extended memory. Be sure to
let CCT386 use this extended memory: remove any ram disk, disk cache program
or EMS simulator.
There are some command line switches, please enter CCT386 HELP to get an
explanation about them.
For further information, please contact:
CELEM COMPUTERS, Boulevard de l'Ourthe 29, 4053 EMBOURG, BELGIUM
Atn FRANCOIS PIETTE Fax: 32-41-67.65.15
EMAIL: 2/293/2202@fidonet.org
Internet: francois.piette@f2202.n293.z2.fidonet.org
This Celem Cache Test program may be freely copied provided the copyright
notice remains displayed.