1 .TH bitesize.d 1m "$Date:: 2007-08-05 #$" "USER COMMANDS"
3 bitesize.d \- analyse disk I/O size by process. Uses DTrace.
7 This produces a report for the size of disk events caused by
8 processes. These are the disk events sent by the block I/O driver.
10 If applications must use the disks, we generally prefer they do so
11 sequentially with large I/O sizes, or larger "bites".
13 Since this uses DTrace, only the root user or users with the
14 dtrace_kernel privilege can run this command.
18 stable - needs the io provider.
21 Sample until Ctrl\-C is hit then print report,
31 command and argument list
37 number of I/O operations
40 The application may be requesting smaller sized operations, which
41 are being rounded up to the nearest sector size or UFS block size.
43 To analyse what the application is requesting, DTraceToolkit programs
44 such as Proc/fddist may help.
47 See the DTraceToolkit for further documentation under the
48 Docs directory. The DTraceToolkit docs may include full worked
49 examples with verbose descriptions explaining the output.
51 bitesize.d will sample until Ctrl\-C is hit.
56 iosnoop(1M), seeksize(1M), dtrace(1M)