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2011-08-27T17:21:16.320
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Yes, it looks like taking an uncontended lock is more expensive in .NET than in Java. (The results on my netbook are slightly more dramatic still.) There are various aspects to performance which will be faster on one platform than another, sometimes to this extent. The HotSpot JIT and the .NET JIT are pretty radically different in various ways - not least because the .NET JIT only runs once on IL, whereas HotSpot is able to optimize more and more as a particular piece of code is run more and more often. The important question is whether this is really significant. If your real life application spends really acquires an uncontented lock 500 million times every minute, it probably is significant - and you should probably redesign your app somewhat. If your real life application actually does real work within the lock (or between acquisitions of the lock) then it's unlikely to be a real bottleneck. I recently found two .NET gotchas (<a href="http://msmvps.com/blogs/jon_skeet/archive/2011/08/22/optimization-and-generics-part-1-the-new-constraint.aspx" rel="noreferrer">part one</a>; <a href="http://msmvps.com/blogs/jon_skeet/archive/2011/08/23/optimization-and-generics-part-2-lambda-expressions-and-reference-types.aspx" rel="noreferrer">part two</a>) which I'm having to work round as I'm writing a "system level library" and they would have made a significant difference when an application did a lot of date/time parsing - but this sort of micro-optimization is rarely worth doing.
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1. POCost of locking in .NET vs Java
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1. USJon Skeet
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1. COThanks, so it could be hat one thing is just a bit slower than another and it's not me who completely missed some obvious point.
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