89 lines
3.1 KiB
HTML
89 lines
3.1 KiB
HTML
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-->
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<html>
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<head>
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<title>bigfork</title>
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<link rel="stylesheet" type="text/css" media="all" href="../man.css">
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</head>
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<body bgcolor=#ffffff>
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<h2 align=center>bigfork</h2>
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<h4 align=center>OS/161 Reference Manual</h4>
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<h3>Name</h3>
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<p>
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bigfork - large forking test
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</p>
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<h3>Synopsis</h3>
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<p>
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<tt>/testbin/bigfork</tt>
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</p>
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<h3>Description</h3>
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<p>
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<tt>bigfork</tt> is a combination of
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the <A HREF=forktest.html>forktest</A>
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and <A HREF=parallelvm.html>parallelvm</A> tests.
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It forks geometrically like forktest, but more times (it goes six
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deep instead of four) and in between each it does some aimless matrix
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operations similar to those in parallelvm.
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It was written to try to come up with a test that generates lots of
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processes (like parallelvm) but works better as a benchmark than
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parallelvm does.
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It is only modestly successful; multiple runs of bigfork still
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typically give a moderately high variance; but as multiple runs of
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parallelvm typically exhibit a huge variance it's a step forward.
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</p>
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<p>
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It uses about 4M of memory, which is bigger than parallelvm but
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comparable to some of the other VM stress tests.
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When run in-core it also offers a limited ability to test the
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multiprocessor scalability of your VM system.
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</p>
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<h3>Requirements</h3>
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<p>
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<tt>bigfork</tt> uses the following system calls:
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<ul>
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<li><A HREF=../syscall/write.html>write</A></li>
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<li><A HREF=../syscall/fork.html>fork</A></li>
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<li><A HREF=../syscall/waitpid.html>waitpid</A></li>
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<li><A HREF=../syscall/_exit.html>_exit</A></li>
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</ul>
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</p>
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<p>
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<tt>bigfork</tt> should run correctly to completion once the VM
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assignment is complete.
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</p>
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</body>
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</html>
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