#!/usr/sbin/dtrace -s /* * rfsio.d - read FS I/O stats, with cache miss rate. * Written using DTrace (Solaris 10 3/05) * * This script provides statistics on the number of reads and the bytes * read from filesystems (logical), and the number of bytes read from * disk (physical). A summary is printed every five seconds by filesystem. * * A total miss-rate is also provided for the file system cache. * * $Id: rfsio.d,v 1.1.1.1 2015/09/30 22:01:09 christos Exp $ * * USAGE: rfsio.d * * IDEA: Richard McDougall, Solaris Internals 2nd Ed, FS Chapter. * * 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 * * 19-Mar-2006 Brendan Gregg Created this. * 23-Apr-2006 " " Last update. */ #pragma D option quiet self int trace; uint64_t lbytes; uint64_t pbytes; dtrace:::BEGIN { trace("Tracing...\n"); } fbt::fop_read:entry /self->trace == 0/ { self->fs_mount = args[0]->v_vfsp == `rootvfs ? "/" : args[0]->v_vfsp->vfs_vnodecovered ? stringof(args[0]->v_vfsp->vfs_vnodecovered->v_path) : NULL; } fbt::fop_read:entry /self->fs_mount != NULL/ { @rio[self->fs_mount, "logical"] = count(); lbytes += args[1]->uio_resid; self->size = args[1]->uio_resid; self->uiop = args[1]; } fbt::fop_read:return /self->size/ { @rbytes[self->fs_mount, "logical"] = sum(self->size - self->uiop->uio_resid); self->size = 0; self->uiop = 0; self->fs_mount = 0; } io::bdev_strategy:start /self->size && args[0]->b_flags & B_READ/ { @rio[self->fs_mount, "physical"] = count(); @rbytes[self->fs_mount, "physical"] = sum(args[0]->b_bcount); pbytes += args[0]->b_bcount; } profile:::tick-5s { trunc(@rio, 20); trunc(@rbytes, 20); printf("\033[H\033[2J"); printf("\nRead IOPS (count)\n"); printa("%-32s %10s %10@d\n", @rio); printf("\nRead Bandwidth (bytes)\n"); printa("%-32s %10s %10@d\n", @rbytes); printf("\nTotal File System miss-rate: %d%%\n", lbytes ? 100 * pbytes / lbytes : 0); trunc(@rbytes); trunc(@rio); lbytes = pbytes = 0; }