Jon Harrop wrote:

> 1. Shared memory and locks should be much faster for synchronization than 
> marshalling between processes.

Shared memory and locking becomes completely intractable beyond about 
10 cores and Intel is already talking about 80 cores.
 
> 2. Forking results in multiple GCs redundantly traversing the same heap and, 
> worst case, it may end up copying the entire heap in the child process in 
> order to deallocate it.

To exploit multi-process message-passing style concurrency you need to 
fork early before much has been allocated.

Erik
-- 
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Erik de Castro Lopo
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"... a discussion of C++'s strengths and flaws always sounds
like an argument about whether one should face north or east
when one is sacrificing one's goat to the rain god."
-- Thant Tessman