110 lines
4.0 KiB
Plaintext
110 lines
4.0 KiB
Plaintext
.\" Copyright (c) 1983 The Regents of the University of California.
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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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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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.\" @(#)tests.ms 6.2 (Berkeley) 4/16/91
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.\" $FreeBSD$
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.\"
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.ds RH Tests
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.NH
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Tests
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.PP
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Our battery of tests consists of four programs,
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read_8192, write_8192, write_4096
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and rewrite_8192 originally written by [McKusick83]
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to evaluate the performance of the new file system in 4.2BSD.
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These programs all follow the same model and are typified by
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read_8192 shown here.
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.DS
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#define BUFSIZ 8192
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main( argc, argv)
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char **argv;
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{
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char buf[BUFSIZ];
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int i, j;
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j = open(argv[1], 0);
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for (i = 0; i < 1024; i++)
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read(j, buf, BUFSIZ);
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}
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.DE
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The remaining programs are included in appendix A.
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.PP
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These programs read, write with two different blocking factors,
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and rewrite logical files in structured file system on the disk
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under test.
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The write programs create new files while the rewrite program
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overwrites an existing file.
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Each of these programs represents an important segment of the
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typical UNIX file system activity with the read program
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representing by far the largest class and the rewrite the smallest.
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.PP
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A blocking factor of 8192 is used by all programs except write_4096.
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This is typical of most 4.2BSD user programs since a standard set of
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I/O support routines is commonly used and these routines buffer
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data in similar block sizes.
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.PP
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For each test run, an empty eight Kilobyte block
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file system was created in the target
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storage system.
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Then each of the four tests was run and timed.
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Each test was run three times;
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the first to clear out any useful data in the cache,
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and the second two to insure that the experiment
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had stablized and was repeatable.
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Each test operated on eight Megabytes of data to
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insure that the cache did not overly influence the results.
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Another file system was then initialized using a
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basic blocking factor of four Kilobytes and the same tests
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were run again and timed.
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A command script for a run appears as follows:
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.DS
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#!/bin/csh
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set time=2
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echo "8K/1K file system"
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newfs /dev/rhp0g eagle
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mount /dev/hp0g /mnt0
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mkdir /mnt0/foo
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echo "write_8192 /mnt0/foo/tst2"
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rm -f /mnt0/foo/tst2
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write_8192 /mnt0/foo/tst2
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rm -f /mnt0/foo/tst2
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write_8192 /mnt0/foo/tst2
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rm -f /mnt0/foo/tst2
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write_8192 /mnt0/foo/tst2
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echo "read_8192 /mnt0/foo/tst2"
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read_8192 /mnt0/foo/tst2
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read_8192 /mnt0/foo/tst2
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read_8192 /mnt0/foo/tst2
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umount /dev/hp0g
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.DE
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.ds RH Results
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.bp
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