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#!/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 3 2007-08-01 10:50:08Z brendan $
*
* 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;
}
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