mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-22 11:17:19 +00:00
110 lines
4.0 KiB
Plaintext
110 lines
4.0 KiB
Plaintext
.\" Copyright (c) 1983 The Regents of the University of California.
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)tests.ms 6.2 (Berkeley) 4/16/91
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.ds RH Tests
|
|
.NH
|
|
Tests
|
|
.PP
|
|
Our battery of tests consists of four programs,
|
|
read_8192, write_8192, write_4096
|
|
and rewrite_8192 originally written by [McKusick83]
|
|
to evaluate the performance of the new file system in 4.2BSD.
|
|
These programs all follow the same model and are typified by
|
|
read_8192 shown here.
|
|
.DS
|
|
#define BUFSIZ 8192
|
|
main( argc, argv)
|
|
char **argv;
|
|
{
|
|
char buf[BUFSIZ];
|
|
int i, j;
|
|
|
|
j = open(argv[1], 0);
|
|
for (i = 0; i < 1024; i++)
|
|
read(j, buf, BUFSIZ);
|
|
}
|
|
.DE
|
|
The remaining programs are included in appendix A.
|
|
.PP
|
|
These programs read, write with two different blocking factors,
|
|
and rewrite logical files in structured file system on the disk
|
|
under test.
|
|
The write programs create new files while the rewrite program
|
|
overwrites an existing file.
|
|
Each of these programs represents an important segment of the
|
|
typical UNIX file system activity with the read program
|
|
representing by far the largest class and the rewrite the smallest.
|
|
.PP
|
|
A blocking factor of 8192 is used by all programs except write_4096.
|
|
This is typical of most 4.2BSD user programs since a standard set of
|
|
I/O support routines is commonly used and these routines buffer
|
|
data in similar block sizes.
|
|
.PP
|
|
For each test run, an empty eight Kilobyte block
|
|
file system was created in the target
|
|
storage system.
|
|
Then each of the four tests was run and timed.
|
|
Each test was run three times;
|
|
the first to clear out any useful data in the cache,
|
|
and the second two to insure that the experiment
|
|
had stablized and was repeatable.
|
|
Each test operated on eight Megabytes of data to
|
|
insure that the cache did not overly influence the results.
|
|
Another file system was then initialized using a
|
|
basic blocking factor of four Kilobytes and the same tests
|
|
were run again and timed.
|
|
A command script for a run appears as follows:
|
|
.DS
|
|
#!/bin/csh
|
|
set time=2
|
|
echo "8K/1K file system"
|
|
newfs /dev/rhp0g eagle
|
|
mount /dev/hp0g /mnt0
|
|
mkdir /mnt0/foo
|
|
echo "write_8192 /mnt0/foo/tst2"
|
|
rm -f /mnt0/foo/tst2
|
|
write_8192 /mnt0/foo/tst2
|
|
rm -f /mnt0/foo/tst2
|
|
write_8192 /mnt0/foo/tst2
|
|
rm -f /mnt0/foo/tst2
|
|
write_8192 /mnt0/foo/tst2
|
|
echo "read_8192 /mnt0/foo/tst2"
|
|
read_8192 /mnt0/foo/tst2
|
|
read_8192 /mnt0/foo/tst2
|
|
read_8192 /mnt0/foo/tst2
|
|
umount /dev/hp0g
|
|
.DE
|
|
.ds RH Results
|
|
.bp
|