#!/usr/sbin/dtrace -s /* * iofile.d - I/O wait time by filename and process. * Written using DTrace (Solaris 10 3/05). * * This prints the total I/O wait times for each filename by process. * This can help determine why an application is performing poorly by * identifying which file they are waiting on, and the total times. * Both disk and NFS I/O are measured. * * $Id: iofile.d,v 1.1.1.1 2015/09/30 22:01:07 christos Exp $ * * USAGE: iofile.d # wait, then hit Ctrl-C to end * * FIELDS: * PID Process ID * CMD Process name * TIME Total wait time for disk events, us * FILE File pathname * * BASED ON: /usr/demo/dtrace/iocpu.d * * SEE ALSO: iosnoop, iotop * * PORTIONS: 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 * * 24-Jul-2005 Brendan Gregg Created this. * 20-Apr-2006 " " Last update. */ #pragma D option quiet /* print header */ dtrace:::BEGIN { printf("Tracing... Hit Ctrl-C to end.\n"); } /* save time at start */ io:::wait-start { self->start = timestamp; } /* process event */ io:::wait-done /self->start/ { /* * wait-done is used as we are measing wait times. It also * is triggered when the correct thread is on the CPU, obviating * the need to link process details to the start event. */ this->elapsed = timestamp - self->start; @files[pid, execname, args[2]->fi_pathname] = sum(this->elapsed); self->start = 0; } /* print report */ dtrace:::END { normalize(@files, 1000); printf("%6s %-12s %8s %s\n", "PID", "CMD", "TIME", "FILE"); printa("%6d %-12.12s %@8d %s\n", @files); }