Monday, 11 May 2009

JamVM on Beagle Board

I've been intending to get a Beagle Board for quite a while now, to replace a Neo1973 as the development platform for JamVM on ARM. The Neo has an ARM920T core, and I've been particularly wanting to test JamVMs code-copying JIT on a more modern implementation (the Beagle Board has a Cortex A8). But I've been waiting for the Rev C board, as this has working EHCI USB host, and 256MB RAM (previous revisions had 128MB). The board arrived 2 weeks ago, but I haven't had much time to set it up until now...

So far, the results are quite encouraging. SciMark 2.0 shows a 55% speed improvement:

While jBYTEmark shows an 82% improvement on Integer tests:

The option -Xcodestats prints out the size of the JIT code-cache when the VM exits. This shows 77K was used after running SciMark 2.0, and 178K after jBYTEmark. This is using the code-profiling introduced in JamVM 1.5.2.

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