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       cache - cache parameters


       cache  [  -L  <line  size>  ]  [  -M  <len>  ]  [  -W  <warmups> ] [ -N
       <repetitions> ]


       cache tries to determine the characteristics of the  memory  hierarchy.
       It  attempts to determine the number of caches, the size of each cache,
       the line size for each cache, and the available memory  parallelism  at
       each  level  in  the memory hierarchy.  The largest amount of memory it
       will examine is len bytes.

       cache first attempts to determine the number  and  size  of  caches  by
       measuring  the  memory  latency  for various memory sizes.  Once it has
       identified  the  various  caches  it   then   measures   the   latency,
       parallelism,  and line size for each cache.  Unfortunately, determining
       the cache size merely from latency  is  exceedingly  difficult  due  to
       variations in cache replacement and prefetching strategies.


       cache  is  an  experimental  benchmark  and  is  known  to fail on many
       processors.  In particular there are a large number  of  machines  with
       weird   caching  behavior  that  confuse  cache  and  prevent  it  from
       accurately determining the number and size of the various caches.


       lmbench(8), line(8), tlb(8), par_mem(8).


       Carl Staelin and Larry McVoy

       Comments, suggestions, and bug reports are always welcome.

(c)2000 Carl Staelin and Larry McVoy$Date$