Dear Clojurians,
I have been trying to get a proper grip on the operation of lazy-seq
and hope somebody will have the time to clarify a point for me. The references
indicate that you should not hold onto the head of a lazy sequence as it blocks
the GC. This has lead to me to believe that a lazy sequence, even while being
active 'downstream' can be GCd 'upstream'. Is this so ?
An example: in this post
http://groups.google.com/group/clojure/browse_thread/thread/57a12f1a0dab5e1b/cb3db6e6ac94092f?#cb3db6e6ac94092f
in the first version of fibo, the call (nth (fibo) 1000000) will cause a seq to
proceed to the millionth element. If memory were tight could earlier elements
be GC'd before nth had reached the end ? My understand is that it can. I ask
because on my machine on Clojure 1.2, (nth (fibo) 1000000) causes a heap
overflow which I don't understand.
Thanks in advance,
Edmund
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