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Channel: Ismael Juma » hotspot
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HotSpot JIT “Optimization”

I noticed Scala ticket #1377 the other day. Even though I think the bug is valid, it’s for different reasons to the ones supplied by the reporter. I had my doubts that the casts would have any...

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Local variables scope in HotSpot

Assume the following code: public void foo() { C c = new C(); bar(c.baz); // assume that baz does not reference c } I was under the impression that HotSpot would not garbage collect c before the local...

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32-bit or 64-bit JVM? How about a Hybrid?

Before x86-64 came along, the decision on whether to use 32-bit or 64-bit mode for architectures that supported both was relatively simple: use 64-bit mode if the application requires the larger...

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Load unsigned and better Compressed Oops

The HotSpot engineers are constantly working on improving performance. I noticed two interesting commits recently: Vladimir Kozlov improved Compressed Oops so that it doesn’t need to do...

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