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V8's approach to scalability is to use generational garbage collection. The main observation behind generational garbage collection is that most objects either die very young or are long-lived. There is no need to examine long-lived objects on every garbage collection because they are likely to still be alive. Introducing generations to the garbage collector allows it to only consider newly allocated objects on most garbage collections.
Splay: A Scalability Benchmark
We have measured the impact of running the Splay benchmark with different splay tree sizes to test how well V8 performs when the working set is increased:
The graph shows that V8 scales well to large object heaps, and that increasing the working set by more than a factor of 7 leads to a performance drop of less than 17%. Even though 35 MB is more memory than most web applications use today, it is necessary to support such working sets to enable tomorrow's web applications.
Source: chromium Blog