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there's some specific tuning JVM configuration for AmazonWS/EC2 building blocks (small, large...)?

Somebody have suggestions for tuning JVM running on these machine profiles?

Regards,

And Past

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This is highly application specific, and really has little to do with EC2 specifically. The only difference on EC2 versus a regular server is that performance is not guaranteed--so pick some safe values and load test.

That being said, here are a few links to get you started:

But you'll get much better mileage if you find something specific to your Java application.

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We have a custom JVM configuration that works fine on physical machines. But, when we deploy these same options on EC2 instances, it works different. I think that configure just the application level, all issues are not solved, considering, as you said, that performance is not guaranteed. We need something new about performance over a shared CPU. These links are well known, already, when we need to optimize physical machines – apast Dec 7 '11 at 23:59
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Well, like I said, you'll need to set values and test them on EC2. What you want to look for is average performance--since you're going to see a lot of fluctuations, you'll need to figure out how many users you can expect EC2 to safely handle, and that requires load testing. – Andrew M. Dec 8 '11 at 1:28
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