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mod_perl guide has memory tracking references (Score:1)
I found the old mod_perl guide informative on this topic:
http://perl.apache.org/docs/1.0/guide/performance.html#How_Shared_Is_My_Memory_ [apache.org]
One thing I've long wondered about is the effect of reference counting on memory sharing. Does all the incrementing and decrementing of refcounts unshare the entire page the object is on? Can anything be done about this, either within Perl or below?
Re:mod_perl guide has memory tracking references (Score:1)
Funny you should ask... The chart http://diotalevi.isa-geek.net/~josh/090909/memory-0.png [isa-geek.net] from http://use.perl.org/~jjore/journal/39604 [perl.org] shows that at least in that sample program, all the reference counts are tightly clustered. You can write off those pages as unshared *but* you can also likely reasonably expect they aren't taking other pages with them.
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