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.
