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- <html>
- <head>
- <title>malloctest</title>
- <body bgcolor=#ffffff>
- <h2 align=center>malloctest</h2>
- <h4 align=center>OS/161 Reference Manual</h4>
- <h3>Name</h3>
- malloctest - some simple tests for userlevel malloc
- <h3>Synopsis</h3>
- /testbin/malloctest [<em>test</em>...]
- <h3>Description</h3>
- malloctest contains 7 tests, 1-7. These may be run interactively or
- from the command line.
- <p>
- Test 1 checks if all the bytes we ask for actually get allocated.
- <p>
- Test 2 checks if malloc gracefully handles failing requests. This test
- assumes that malloc will eventually fail if one keeps allocating
- enough memory, instead of promising memory it can't deliver and
- then (perhaps) killing processes when it runs out. More detail
- regarding this condition can be found in comments in the source code.
- <p>
- Test 3 also checks if malloc gracefully handles failing requests, and
- thus has the same restrictions as test 2.
- <p>
- Test 4 attempts to check if malloc coalesces the free list properly.
- This test is only meant for first-fit, next-fit, or best-fit
- allocators; anything else will most likely confuse it. Running test 4
- after other tests may confuse it as well.
- <p>
- Tests 5-7 are a randomized stress test. Test 5 uses pseudorandom seed
- 0. Test 6 seeds the random generator from the
- <A HREF=../dev/random.html>random:</A> device. Test 7 prompts you for
- a specific seed.
- <p>
- <h3>Requirements</h3>
- malloctest uses the following system calls:
- <ul>
- <li> <A HREF=../syscall/open.html>open</A>
- <li> <A HREF=../syscall/read.html>read</A>
- <li> <A HREF=../syscall/write.html>write</A>
- <li> <A HREF=../syscall/close.html>close</A>
- <li> <A HREF=../syscall/_exit.html>_exit</A>
- </ul>
- malloctest also requires a user-level malloc/free implementation.
- <p>
- Your system should pass all the malloctest tests, subject to the
- conditions described above, once your user-level malloc is complete.
- </body>
- </html>
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