#!/usr/sbin/dtrace -s
/*
* nfswizard.d - nfs client activity wizard.
* Written using DTrace (Solaris 10 3/05).
*
* This examines activity caused by NFS client processes on the same server
* that you are running this script on. A detailed report is generated
* to explain various details of NFS client activity, including response
* times and file access.
*
* $Id: nfswizard.d 3 2007-08-01 10:50:08Z brendan $
*
* USAGE: nfswizard.d # hit Ctrl-C to end sample
*
* COPYRIGHT: 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
*
* 02-Dec-2005 Brendan Gregg Created this.
* 20-Apr-2006 " " Last update.
*/
#pragma D option quiet
dtrace:::BEGIN
{
printf("Tracing... Hit Ctrl-C to end.\n");
scriptstart = walltimestamp;
timestart = timestamp;
}
io:nfs::start
{
/* tally file sizes */
@file[args[2]->fi_pathname] = sum(args[0]->b_bcount);
/* time response */
start[args[0]->b_addr] = timestamp;
/* overall stats */
@rbytes = sum(args[0]->b_flags & B_READ ? args[0]->b_bcount : 0);
@wbytes = sum(args[0]->b_flags & B_READ ? 0 : args[0]->b_bcount);
@events = count();
}
io:nfs::done
/start[args[0]->b_addr]/
{
/* calculate and save response time stats */
this->elapsed = timestamp - start[args[0]->b_addr];
@maxtime = max(this->elapsed);
@avgtime = avg(this->elapsed);
@qnztime = quantize(this->elapsed / 1000);
}
dtrace:::END
{
/* print header */
printf("NFS Client Wizard. %Y -> %Y\n\n", scriptstart, walltimestamp);
/* print read/write stats */
printa("Read: %@d bytes ", @rbytes);
normalize(@rbytes, 1000000);
printa("(%@d Mb)\n", @rbytes);
printa("Write: %@d bytes ", @wbytes);
normalize(@wbytes, 1000000);
printa("(%@d Mb)\n\n", @wbytes);
/* print throughput stats */
denormalize(@rbytes);
normalize(@rbytes, (timestamp - timestart) / 1000000);
printa("Read: %@d Kb/sec\n", @rbytes);
denormalize(@wbytes);
normalize(@wbytes, (timestamp - timestart) / 1000000);
printa("Write: %@d Kb/sec\n\n", @wbytes);
/* print time stats */
printa("NFS I/O events: %@d\n", @events);
normalize(@avgtime, 1000000);
printa("Avg response time: %@d ms\n", @avgtime);
normalize(@maxtime, 1000000);
printa("Max response time: %@d ms\n\n", @maxtime);
printa("Response times (us):%@d\n", @qnztime);
/* print file stats */
printf("Top 25 files accessed (bytes):\n");
printf(" %-64s %s\n", "PATHNAME", "BYTES");
trunc(@file, 25);
printa(" %-64s %@d\n", @file);
}