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
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.