#!/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);
}