#!/usr/sbin/dtrace -s
 /*
  * bitesize.d - analyse disk I/O size by process.
  *              Written using DTrace (Solaris 10 3/05).
  *
  * 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
  * with large I/O sizes.
  *
  * $Id: bitesize.d 3 2007-08-01 10:50:08Z brendan $
  *
  * USAGE:	bitesize.d	# wait several seconds, then hit Ctrl-C
  *
  * FIELDS:
  *		PID		process ID
  *		CMD		command and argument list
  *		value		size in bytes
  *		count		number of I/O operations
  *
  * 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.
  *
  * SEE ALSO: seeksize.d, iosnoop
  *
  * COPYRIGHT: Copyright (c) 2006 Brendan Gregg.
  *
  * CDDL HEADER START
  *
  *  The contents of this file are subject to the terms of the
  *  Common Development and Distribution License, Version 1.0 only
  *  (the "License").  You may not use this file except in compliance
  *  with the License.
  *
  *  You can obtain a copy of the license at Docs/cddl1.txt
  *  or http://www.opensolaris.org/os/licensing.
  *  See the License for the specific language governing permissions
  *  and limitations under the License.
  *
  * CDDL HEADER END
  *
  * 31-Mar-2004	Brendan Gregg	Created this, build 51.
  * 10-Oct-2004	   "      "	Rewrote to use the io provider, build 63.
  * 18-Feb-2006	   "      "	Last update.
  */
 
 #pragma D option quiet
 
 /*
  * Print header
  */
 dtrace:::BEGIN
 {
 	printf("Tracing... Hit Ctrl-C to end.\n");
 }
 
 /*
  * Process io start
  */
 io:::start
 {
 	/* fetch details */
 	this->size = args[0]->b_bcount;
 
 	/* store details */
 	@Size[pid, curpsinfo->pr_psargs] = quantize(this->size);
 }
 
 /*
  * Print final report
  */
 dtrace:::END
 {
 	printf("\n%8s  %s\n", "PID", "CMD");
 	printa("%8d  %S\n%@d\n", @Size);
 }