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<h1>VMKit: a substrate for virtual machines</h1> | |
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<p>The VMKit project is a framework for building virtual machines. It uses | |
<a href="http://llvm.org">LLVM</a> for compiling and optimizing high-level | |
languages to machine code, and <a href="http://jikesrvm.org/MMTk">MMTk</a> | |
to manage memory. J3 is an implementation of a JVM with VMKit. | |
You can <a href="get_started.html">get and build</a> the source of J3 | |
today.</p> | |
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<h2 id="goals">Features</h2> | |
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<p>VMKit provides the following features:</p> | |
<p><b>End-User Features</a></b>:</p> | |
<ul> | |
<li>Precise garbage collection.</li> | |
<li>Just-in-Time and Ahead-of-Time compilation.</li> | |
<li>Portable on many architectures (x86, x64, ppc32, ppc64, arm).</li> | |
</ul> | |
<p><b>Developer Features</a></b>:</p> | |
<ul> | |
<li>Relatively small code base (~ 20k loc per VM)</li> | |
<li>Infrastructure for running multiple VM/applications in a single | |
process</li> | |
<li>Infrastructure for virtual machine research and development</li> | |
</ul> | |
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<h2>Why?</h2> | |
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<p>The development of VMKit was started out of a need to factorize virtual | |
machine development. The JVM and CLI virtual machine have many | |
similarities, but are too high-level to be the basis of a "universal" | |
virtual machine. The LLVM IR on the opposite is low-level enough to be | |
able to execute these VMs. VMKit is a proof of concept implementation | |
towards that direction.</p> | |
<p>Paper on the design of VMKit: | |
<ul> | |
<li><a href="publications/vmkit.html">VMKit: a Substrate for Managed Runtime Environments</a> | |
</li> | |
</ul> | |
<p>The PhD thesis that initiated VMKit: | |
<ul> | |
<li><a href="publications/thesis.html">Nicolas Geoffray's PhD thesis</a> | |
</li> | |
</ul> | |
<p>An introduction to VMKit can be found in the following video lectures: | |
<ul> | |
<li><a href="http://llvm.org/devmtg/2009-10/Geoffray_GarbageCollectionVMKit-700kbps.mov"> | |
Presentation of VMKit/MMTk at the 2009 LLVM Developer's Meeting</a> | |
</li> | |
<li><a href="http://llvm.org/devmtg/2008-08/Geoffray_VMKitProject_Lo.3gp"> | |
Presentation of VMKit at the 2008 LLVM Developer's Meeting</a> | |
</li> | |
</ul> | |
</p> | |
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<h2>Current Status</h2> | |
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<p>VMKit currently has a decent implementation of a JVM. It executes | |
large projects (e.g. OSGi Felix, Tomcat, Eclipse) and the | |
<a href="http://dacapobench.org">DaCapo benchmarks</a>. | |
</p> | |
<p>The JVM has been tested on Linux/x64, Linux/x86, Linux/ppc32, MacOSX/x64, | |
MacOSX/x86, MacOSX/ppc32. The JVM may work on ppc64. Support for | |
Windows has not been investigated. | |
</p> | |
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<h2>Get it and get involved!</h2> | |
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<p>Start by <a href="get_started.html">getting the code, building it, and | |
playing with it</a>. This will show you the sorts of things we can do | |
today.</p> | |
<p>Once you've done that, please consider <a href="get_involved.html">getting | |
involved in the VMKit community</a>. Currently, VMKit is tightly | |
integrated into the LLVM community. You can sign up for the LLVM mailing | |
list to ask and learn about how the project works.</p> | |
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