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1991-05-21
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CCT (c) F. PIETTE & CELEM COMPUTERS
CELEM CACHE TEST
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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 time required to manage a constant amount
of memory spread in a memory space ranging from 2 to 320KB.
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 gives a Memory Index (MI) of performance showing the global
efficiency of the memory subsystem, giving a greater weight for small space
sizes. The value is relative to a CELEM-286 running at 12 MHz, 0 wait state.
Celem Cache Test gives also a Cache Index (CI) of performance reflecting the
efficiency of the cache system. It is a logarithmic function of the area of
the curve drawn by the test and is independent of the clock rate.
Besides these two indexes, 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.
Finally, note that all tests are done using 16 bit words even on 32 bit
machines. This reflects most of the DOS based programs wich are 16 bit only.
For 32 bit machines, the actual times could be divided by two if Celem Cache
Test had used 32 bit words, increasing the global performance by a factor of
two, reflecting the performance that a 32 bit application could give.
For further information, please contact:
CELEM COMPUTERS, Boulevard de l'Ourthe 29, 4053 EMBOURG, BELGIUM
Atn FRANCOIS PIETTE Fax: 32-41-67.65.15
This Celem Cache Test program may be freely copied provided the copyright
notice remains displayed.