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by PeCaN
3504 days ago
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Generally when referring to the JVM's performance people are talking about IBM J9, Azul Zing, HotSpot, etc, while Android has its own VM. Additionally, most high-performance JVMs are optimized for long-running server applications, wile the CLR is optimized more for desktop applications (considerably better startup time, is fast without requiring lots of warmup, but doesn't do some of the very advanced optimizations JVMs tend to do). I suspect it would be easier to make the CLR performant on mobile than to make a JVM fast with constrained memory. So basically, the CLR is probably already competitive on mobile devices. Does anyone know if Windows Phone uses a stock CLR or if they reimplemented it? Seems pretty snappy. |
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The .NET CLR isn't really "fast without requiring lots of warmup". It's a much simpler design that out of the box simply compiles each method the first time it's used. It doesn't "warm up" because it doesn't do profile guided or speculative optimisations at all. The weakness of the CLR is one reason C# pushes more optimisation complexity onto the developer e.g. having to mark virtual methods explicitly instead of methods being virtual by default. With respect to memory usage I guess it's not much different.
There are JVMs designed for old candybar feature phones (J2ME etc). The issue is not "can you make a mobile JVM" as the answer is clearly yes for any type of phone, even very old ones. The issue is "how much fancy technology can you fit in that space".