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- .\" $Id$
- .TH LAT_PAGEFAULT 8 "$Date$" "(c)1994 Larry McVoy" "LMBENCH"
- .SH NAME
- lat_pagefault \- measure the cost of pagefaulting pages from a file
- .SH SYNOPSIS
- .B lat_pagefault
- .I file
- [
- .I file....
- ]
- .SH DESCRIPTION
- .B lat_pagefault
- times how fast a page of a file can be faulted in. The file is flushed from
- (local) memory by using the \f(CBmsync()\fP 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.)
- .PP
- The benchmark maps in the entire file and the access pages backwards using
- a stride of 256K kilobytes.
- .SH OUTPUT
- Output format is below; it prints the average cost of page faulting a page.
- .sp
- .ft CB
- Pagefaults on <file>: <d> usecs
- .ft
- .SH BUGS
- Using a stride of 256K may be a bad idea because SCSI controllers
- may have caches bigger than that.
- .SH ACKNOWLEDGEMENT
- Funding for the development of
- this tool was provided by Sun Microsystems Computer Corporation.
- .SH "SEE ALSO"
- lmbench(8), mmap(2), munmap(2).
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