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#!/usr/sbin/dtrace -s
/*
* hotspot.d - plot disk event by location, look for hotspots.
* Written in DTrace (Solaris 10 3/05).
*
* This simple DTrace script determines if disk activity is occuring in
* the one place - a "hotspot". This helps us understand the system's usage
* of a disk, it does not imply that the existance or not of a hotspot is
* good or bad (often may be good, less seeking).
*
* $Id: hotspot.d 3 2007-08-01 10:50:08Z brendan $
*
* USAGE: hotspot.d # hit Ctrl-C to end
*
* FIELDS:
* Disk disk instance name
* Major driver major number
* Minor driver minor number
* value location, by megabyte
* count number of I/O operations
*
* COPYRIGHT: Copyright (c) 2005, 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
*
* 07-May-2005 Brendan Gregg Created this.
* 20-Apr-2006 " " Last update.
*/
#pragma D option quiet
inline int DISK_MB_MAX = 1000000; /* max size of a single disk */
inline int REPORT_SCALE_MB = 1000; /* output step size for report */
/*
* Print header
*/
dtrace:::BEGIN
{
printf("Tracing... Hit Ctrl-C to end.\n");
}
/*
* Process disk event
*/
io:::start
{
this->mb = args[0]->b_blkno / 2048;
@Block[args[1]->dev_statname, args[1]->dev_major, args[1]->dev_minor] =
lquantize(this->mb, 0, DISK_MB_MAX, REPORT_SCALE_MB);
}
/*
* Print final report
*/
dtrace:::END
{
printa("Disk: %s Major,Minor: %d,%d\n%@d\n", @Block);
}
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