Thanks Peter,
Very interesting... I'll experiment with the premise that if a certain
percentage of the heap is swapped, it's OK, because it will not be used anyway.
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Actually, if you allocate 1GB of heap, it will never all be used. For example,
with a young generation of 300MB, once the heap size reaches 700MB, on the next
GC a full GC will be done. Why? Because the Sun JVM makes the pessimistic
assumption that all objects in the young generation will survi
Peter,
I'm a bit confused by your answer, that if you have 1 gig of ram on a box it's
ok to set the heap to 1 gig. Through reading your other postings I know that
you have coded your own JVM based on Sun's source, so you know your stuff. And
I know that you know the heap is just the new and ten
Our rule is thumb is to not set the heap larger than the amount of RAM on the
machine. Note that the Sun JVM will never use all of the heap allocated due to
its algorithm for determining when to do a major collection, so even in a 1GB
system setting the heap to 1GB still leaves enough free RAM
