File System Caching
n
Beware of host OS buffer cache
n
How to overcome?
u
reducing buffer cache size
u
truncate files (reallocates blocks)
u
Direct I/O (DIO) (bypass cache)
u
remount FS (invalidates cache)
u
alternate between:
«
normal I/O, DIO, MMAP I/O
6/30/2010
Data Test Program (dt)
32