Last (hopefully) Lion issue
I was getting frequent lockups - I wasn’t sure initially what was going on, but it became apparent that it was something related to Eclipse. While eclipse was building my projects, it would crawl to a halt (always at the same place on the same project). Other apps would be responsive- for a while, but eventually everything would crawl to a halt.
I think the ultimate issue was actually with the Java VM. I had two entries in my eclipse.ini: UseConcMarkSweepGC and UseCompressedOops which I had added per the ScalaIDE docs.
Once I removed these, things started behaving again. I didn’t like using the concurrent mark and sweep algorithm anyway, as I thought the pauses were worse. But something is certainly misbehaving in that algorithm (or in the VM as a whole) with Lion to allow it to lock up the entire machine.
It seems that the JDK available for Lion has at least changed some defaults (like the memory sizes I discovered earlier) and possibly some other things (memory/gc/hotspot-related).
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