.TH bitesize.d 1m "Jun 15, 2005" "version 1.00" "USER COMMANDS" .SH NAME bitesize.d \- analyse disk I/O size by process. Uses DTrace. .SH SYNOPSIS .B bitesize.d .SH DESCRIPTION This produces a report for the size of disk events caused by processes. These are the disk events sent by the block I/O driver. If applications must use the disks, we generally prefer they do so sequentially with large I/O sizes, or larger "bites". Since this uses DTrace, only users with root privileges can run this command. .SH EXAMPLES .TP Sample until Ctrl\-C is hit then print report, # .B bitesize.d .PP .SH FIELDS .TP PID process ID .TP CMD command and argument list .TP value size in bytes .TP count number of I/O operations .PP .SH NOTES The application may be requesting smaller sized operations, which are being rounded up to the nearest sector size or UFS block size. To analyse what the application is requesting, DTraceToolkit programs such as Proc/fddist may help. .PP .SH DOCUMENTATION See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with verbose descriptions explaining the output. .SH EXIT bitesize.d will sample until Ctrl\-C is hit. .SH AUTHOR Brendan Gregg [Sydney, Australia] .SH SEE ALSO iosnoop(1M), seeksize(1M), dtrace(1M)