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A comment on The Future of the LispM. Parent comment
You may need to require read barriers if you do concurrent compaction of the heap, as a lot of the "real-time" collectors do.
But state of the art collectors like G1 can do even concurrent marking (but stop-the-world compaction) without mutator read barriers.
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.63....
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You may need to require read barriers if you do concurrent compaction of the heap, as a lot of the "real-time" collectors do.
But state of the art collectors like G1 can do even concurrent marking (but stop-the-world compaction) without mutator read barriers.
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.63....