1 #!/usr/sbin/dtrace -s 2 /* 3 * iofile.d - I/O wait time by filename and process. 4 * Written using DTrace (Solaris 10 3/05). 5 * 6 * This prints the total I/O wait times for each filename by process. 7 * This can help determine why an application is performing poorly by 8 * identifying which file they are waiting on, and the total times. 9 * Both disk and NFS I/O are measured. 10 * 11 * $Id: iofile.d,v 1.1.1.1 2015/09/30 22:01:07 christos Exp $ 12 * 13 * USAGE: iofile.d # wait, then hit Ctrl-C to end 14 * 15 * FIELDS: 16 * PID Process ID 17 * CMD Process name 18 * TIME Total wait time for disk events, us 19 * FILE File pathname 20 * 21 * BASED ON: /usr/demo/dtrace/iocpu.d 22 * 23 * SEE ALSO: iosnoop, iotop 24 * 25 * PORTIONS: Copyright (c) 2005, 2006 Brendan Gregg. 26 * 27 * CDDL HEADER START 28 * 29 * The contents of this file are subject to the terms of the 30 * Common Development and Distribution License, Version 1.0 only 31 * (the "License"). You may not use this file except in compliance 32 * with the License. 33 * 34 * You can obtain a copy of the license at Docs/cddl1.txt 35 * or http://www.opensolaris.org/os/licensing. 36 * See the License for the specific language governing permissions 37 * and limitations under the License. 38 * 39 * CDDL HEADER END 40 * 41 * 24-Jul-2005 Brendan Gregg Created this. 42 * 20-Apr-2006 " " Last update. 43 */ 44 45 #pragma D option quiet 46 47 /* print header */ 48 dtrace:::BEGIN 49 { 50 printf("Tracing... Hit Ctrl-C to end.\n"); 51 } 52 53 /* save time at start */ 54 io:::wait-start 55 { 56 self->start = timestamp; 57 } 58 59 /* process event */ 60 io:::wait-done 61 /self->start/ 62 { 63 /* 64 * wait-done is used as we are measing wait times. It also 65 * is triggered when the correct thread is on the CPU, obviating 66 * the need to link process details to the start event. 67 */ 68 this->elapsed = timestamp - self->start; 69 @files[pid, execname, args[2]->fi_pathname] = sum(this->elapsed); 70 self->start = 0; 71 } 72 73 /* print report */ 74 dtrace:::END 75 { 76 normalize(@files, 1000); 77 printf("%6s %-12s %8s %s\n", "PID", "CMD", "TIME", "FILE"); 78 printa("%6d %-12.12s %@8d %s\n", @files); 79 } 80