#!/usr/sbin/dtrace -s
/*
* iofile.d - I/O wait time by filename and process.
* Written using DTrace (Solaris 10 3/05).
*
* This prints the total I/O wait times for each filename by process.
* This can help determine why an application is performing poorly by
* identifying which file they are waiting on, and the total times.
* Both disk and NFS I/O are measured.
*
* 20-Apr-2006, ver 0.71
*
* USAGE: iofile.d # wait, then hit Ctrl-C to end
*
* FIELDS:
* PID Process ID
* CMD Process name
* TIME Total wait time for disk events, us
* FILE File pathname
*
* BASED ON: /usr/demo/dtrace/iocpu.d
*
* SEE ALSO: iosnoop, iotop
*
* PORTIONS: 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
*
* 24-Jul-2005 Brendan Gregg Created this.
*/
#pragma D option quiet
/* print header */
dtrace:::BEGIN
{
printf("Tracing... Hit Ctrl-C to end.\n");
}
/* save time at start */
io:::wait-start
{
self->start = timestamp;
}
/* process event */
io:::wait-done
/self->start/
{
/*
* wait-done is used as we are measing wait times. It also
* is triggered when the correct thread is on the CPU, obviating
* the need to link process details to the start event.
*/
this->elapsed = timestamp - self->start;
@files[pid, execname, args[2]->fi_pathname] = sum(this->elapsed);
self->start = 0;
}
/* print report */
dtrace:::END
{
normalize(@files, 1000);
printf("%6s %-12s %8s %s\n", "PID", "CMD", "TIME", "FILE");
printa("%6d %-12.12s %@8d %s\n", @files);
}