Flushing the cache on the Sun

[Carol Sullivan]

I have been running some benchmark tests on the Sun The tests are for
reads/writes to disk. I try to ensure that the cache is flushed on a read
by alternatley reading from a large file. I have made this alternate file
very large (32,000 Kbytes). I am not convinced that this has any affect
when I am trying to read a file that is 100 - 1000 K.  

If any one can suggest a way of flushing the cache I'd appreciate it.