135 lines
5.2 KiB
HTML
135 lines
5.2 KiB
HTML
<!--
|
|
Copyright (c) 2015
|
|
The President and Fellows of Harvard College.
|
|
|
|
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. 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 UNIVERSITY 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 UNIVERSITY 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.
|
|
-->
|
|
<html>
|
|
<head>
|
|
<title>sbrktest</title>
|
|
<link rel="stylesheet" type="text/css" media="all" href="../man.css">
|
|
</head>
|
|
<body bgcolor=#ffffff>
|
|
<h2 align=center>sbrktest</h2>
|
|
<h4 align=center>OS/161 Reference Manual</h4>
|
|
|
|
<h3>Name</h3>
|
|
<p>
|
|
sbrktest - program for testing <A HREF=../syscall/sbrk.html>sbrk</A>
|
|
</p>
|
|
|
|
<h3>Synopsis</h3>
|
|
<p>
|
|
<tt>/testbin/sbrktest</tt> [<em>test-number ...</em>]
|
|
</p>
|
|
|
|
<h3>Description</h3>
|
|
<p>
|
|
<tt>sbrktest</tt> contains a number of tests for memory allocation,
|
|
using the <A HREF=../syscall/sbrk.html>sbrk</A> low-level interface
|
|
directly instead of via <A HREF=../libc/malloc.htmlm>malloc</A>.
|
|
It is similar to <A HREF=malloctest.html>malloctest</A> in general
|
|
layout and approach, but concentrates on kernel-level memory
|
|
allocation rather than the behavior of C malloc.
|
|
</p>
|
|
|
|
<p>
|
|
There are 21 tests:
|
|
<table>
|
|
<tr><td width=5% valign=top>1</td><td>Allocate one page.</td></tr>
|
|
<tr><td valign=top>2</td><td>Allocate and free one page.</td></tr>
|
|
<tr><td valign=top>3</td><td>Allocate and free several pages.</td></tr>
|
|
<tr><td valign=top>4</td><td>Allocate several pages and free them one
|
|
at a time.</td></tr>
|
|
<tr><td valign=top>5</td><td>Check the heap end.
|
|
This test crashes intentionally.</td></tr>
|
|
<tr><td valign=top>6</td><td>Allocate and check the heap end.
|
|
This test crashes intentionally.</td></tr>
|
|
<tr><td valign=top>7</td><td>Allocate and free and check the heap end.
|
|
This test crashes intentionally.</td></tr>
|
|
<tr><td valign=top>8</td><td>Allocate several, free some, then check
|
|
the heap end.
|
|
This test crashes intentionally.</td></tr>
|
|
<tr><td valign=top>9</td><td>Allocate all memory in a big chunk.</td></tr>
|
|
<tr><td valign=top>10</td><td>Allocate all memory one page at a time.</td></tr>
|
|
<tr><td valign=top>11</td><td>Allocate a lot and intentionally leak
|
|
it.</td></tr>
|
|
<tr><td valign=top>12</td><td>Fork and then allocate.</td></tr>
|
|
<tr><td valign=top>13</td><td>Allocate and then fork.</td></tr>
|
|
<tr><td valign=top>14</td><td>Allocate and then fork and free.</td></tr>
|
|
<tr><td valign=top>15</td><td>Allocate, fork, allocate more, and
|
|
free.</td></tr>
|
|
<tr><td valign=top>16</td><td>Small stress test.</td></tr>
|
|
<tr><td valign=top>17</td><td>Randomized small stress test.</td></tr>
|
|
<tr><td valign=top>18</td><td>Small stress test with specific seed.</td></tr>
|
|
<tr><td valign=top>19</td><td>Large stress test.</td></tr>
|
|
<tr><td valign=top>20</td><td>Randomized large stress test.</td></tr>
|
|
<tr><td valign=top>21</td><td>Large stress test with specific seed.</td></tr>
|
|
</table>
|
|
</p>
|
|
|
|
<p>
|
|
One or more tests may be run specifically by giving the numbers on the
|
|
command line; otherwise, <tt>sbrktest</tt> prints the list and prompts
|
|
for a test number to run.
|
|
</p>
|
|
|
|
<p>
|
|
Note that the tests that crash intentionally should crash the
|
|
<tt>sbrktest</tt> program with an illegal memory access
|
|
(<tt>SIGSEGV</tt>) -- they should not crash your kernel.
|
|
</p>
|
|
|
|
<p>
|
|
The tests that attempt to allocate all available memory may be slow,
|
|
depending on the per-process limits you place on memory allocation (if
|
|
any) relative to the amount of available physical RAM.
|
|
</p>
|
|
|
|
<h3>Requirements</h3>
|
|
<p>
|
|
<tt>sbrktest</tt> uses the following system calls:
|
|
<ul>
|
|
<li><A HREF=../syscall/sbrk.html>sbrk</A></li>
|
|
<li><A HREF=../syscall/open.html>open</A></li>
|
|
<li><A HREF=../syscall/read.html>read</A></li>
|
|
<li><A HREF=../syscall/write.html>write</A></li>
|
|
<li><A HREF=../syscall/close.html>close</A></li>
|
|
<li><A HREF=../syscall/fork.html>fork</A></li>
|
|
<li><A HREF=../syscall/waitpid.html>waitpid</A></li>
|
|
<li><A HREF=../syscall/_exit.html>_exit</A></li>
|
|
</ul>
|
|
</p>
|
|
|
|
<p>
|
|
<tt>sbrktest</tt> should work properly once you have implemented the
|
|
sbrk system call and a virtual memory system that supports dynamic
|
|
memory allocation.
|
|
It will not work with dumbvm.
|
|
</p>
|
|
|
|
</body>
|
|
</html>
|