SYNOPSISlat_pagefault [ -P <parallelism> ] [ -W <warmups> ] [ -N <repetitions> ] file [ file.... ]
DESCRIPTIONlat_pagefault times how fast a page of a file can be faulted in. The file is flushed from (local) memory by using the msync() interface with the invalidate flag set. (Note that NFS does not send this over the wire so this makes for a handy way to measure the cost of going across the wire.)
The benchmark maps in the entire file and the access pages backwards using a stride of 256K kilobytes.
OUTPUTOutput format is below; it prints the average cost of page faulting a page.
Pagefaults on <file>: <d> usecs
BUGSUsing a stride of 256K may be a bad idea because SCSI controllers may have caches bigger than that.
ACKNOWLEDGEMENTFunding for the development of this tool was provided by Sun Microsystems Computer Corporation.
AUTHORCarl Staelin and Larry McVoy
Comments, suggestions, and bug reports are always welcome.