1#!/usr/sbin/dtrace -s 2/* 3 * rfileio.d - read file I/O stats, with cache miss rate. 4 * Written using DTrace (Solaris 10 3/05) 5 * 6 * This script provides statistics on the number of reads and the bytes 7 * read from filesystems (logical), and the number of bytes read from 8 * disk (physical). A summary is printed every five seconds by file. 9 * 10 * A total miss-rate is also provided for the file system cache. 11 * 12 * 23-Apr-2006, ver 0.70 13 * 14 * USAGE: rfileio.d 15 * 16 * IDEA: Richard McDougall, Solaris Internals 2nd Ed, FS Chapter. 17 * 18 * COPYRIGHT: Copyright (c) 2006 Brendan Gregg. 19 * 20 * CDDL HEADER START 21 * 22 * The contents of this file are subject to the terms of the 23 * Common Development and Distribution License, Version 1.0 only 24 * (the "License"). You may not use this file except in compliance 25 * with the License. 26 * 27 * You can obtain a copy of the license at Docs/cddl1.txt 28 * or http://www.opensolaris.org/os/licensing. 29 * See the License for the specific language governing permissions 30 * and limitations under the License. 31 * 32 * CDDL HEADER END 33 * 34 * 19-Mar-2006 Brendan Gregg Created this. 35 */ 36 37#pragma D option quiet 38 39self int trace; 40uint64_t lbytes; 41uint64_t pbytes; 42 43dtrace:::BEGIN 44{ 45 trace("Tracing...\n"); 46} 47 48fbt::fop_read:entry 49/self->trace == 0 && args[0]->v_path/ 50{ 51 self->pathname = cleanpath(args[0]->v_path); 52 @rio[self->pathname, "logical"] = count(); 53 lbytes += args[1]->uio_resid; 54 self->size = args[1]->uio_resid; 55 self->uiop = args[1]; 56} 57 58fbt::fop_read:return 59/self->size/ 60{ 61 @rbytes[self->pathname, "logical"] = 62 sum(self->size - self->uiop->uio_resid); 63 self->size = 0; 64 self->uiop = 0; 65 self->pathname = 0; 66} 67 68io::bdev_strategy:start 69/self->size && args[0]->b_flags & B_READ/ 70{ 71 @rio[self->pathname, "physical"] = count(); 72 @rbytes[self->pathname, "physical"] = sum(args[0]->b_bcount); 73 pbytes += args[0]->b_bcount; 74} 75 76profile:::tick-5s 77{ 78 trunc(@rio, 20); 79 trunc(@rbytes, 20); 80 printf("\033[H\033[2J"); 81 printf("\nRead IOPS, top 20 (count)\n"); 82 printa("%-54s %10s %10@d\n", @rio); 83 printf("\nRead Bandwidth, top 20 (bytes)\n"); 84 printa("%-54s %10s %10@d\n", @rbytes); 85 printf("\nTotal File System miss-rate: %d%%\n", 86 lbytes ? 100 * pbytes / lbytes : 0); 87 trunc(@rbytes); 88 trunc(@rio); 89 lbytes = pbytes = 0; 90} 91