#!/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,v 1.1.1.1 2015/09/30 22:01:07 christos Exp $ * * 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); }