NAME

rwbytype.d - read/write bytes by vnode type. Uses DTrace.

SYNOPSIS

rwbytype.d

DESCRIPTION

This program identifies the vnode type of read/write activity - whether that is for regular files, sockets, character special devices, etc. This is measuring at the application level, so file activity may well be cached by the system.

Since this uses DTrace, only users with root privileges can run this command.

EXAMPLES

This samples until Ctrl-C is hit.: # rwbytype.d

FIELDS

PID: process ID
CMD: process name
VNODE: vnode type (describes I/O type)
DIR: direction, Read or Write
BYTES: total bytes

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.

EXIT

rwbytype.d will sample until Ctrl-C is hit.

AUTHOR

Brendan Gregg [Sydney, Australia]