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73 lines
2.4 KiB
Plaintext
73 lines
2.4 KiB
Plaintext
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#!/usr/sbin/dtrace -s
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/*-
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* Copyright 2014 John-Mark Gurney.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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*/
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#pragma D option quiet
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/* from http://www.mail-archive.com/dtrace-discuss@opensolaris.org/msg03755.html */
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#pragma D option aggsize=8m
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#pragma D option bufsize=16m
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#pragma D option dynvarsize=32m
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/*
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#pragma D option aggrate=0
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#pragma D option cleanrate=50Hz
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*/
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dtrace:::BEGIN
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{
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printf("Tracing... Hit Ctrl-C to end.\n");
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dstart = timestamp;
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}
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io:::start
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{
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start_time[arg0] = timestamp;
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}
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io:::done
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/this->start = start_time[arg0]/
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{
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this->delta = (timestamp - this->start) / 1000;
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@q[args[1]->device_name, args[1]->unit_number] =
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lquantize(this->delta, 4000, 80000, 4000);
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@max[args[1]->device_name, args[1]->unit_number] = max(this->delta);
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@avg[args[1]->device_name, args[1]->unit_number] = avg(this->delta);
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@stddev[args[1]->device_name, args[1]->unit_number] = stddev(this->delta);
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start_time[arg0] = 0;
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}
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dtrace:::END
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{
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printf("total time, us: %d\n", (timestamp - dstart) / 1000);
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printa(" %s (%d), us:\n%@d\n", @q);
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printa("max%s (%d), us: %@d\n", @max);
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printa("avg%s (%d), us: %@d\n", @avg);
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printa("stddev%s (%d), us: %@d\n", @stddev);
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}
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