The future of "frozen" types as the number of CPU cores increases

Daniel Stutzbach daniel at
Wed Feb 17 12:44:49 CET 2010

On Tue, Feb 16, 2010 at 3:15 PM, John Nagle <nagle at> wrote:

> One possible implementation would be
> to have unfrozen objects managed by reference counting and locking as
> in CPython.  Frozen objects would live in a different memory space and be
> garbage collected by a concurrent garbage collector.

A concurrent garbage collector for frozen object would still need to walk
unfrozen objects, to find references to frozen objects.

Daniel Stutzbach, Ph.D.
President, Stutzbach Enterprises, LLC <>
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