On Wed, Jun 19, 2013 at 08:45:55AM -0700, Victor Stinner wrote:
> > 1. All memory allocated in a parallel context is localized to a
> > private heap.
>
> How do you allocate memory in this "private" heap? Did you add new
> functions to allocate memory?
Yup:
_PyHeap_Malloc():
http://hg.python.org/sandbox/trent/file/0e70a0caa1c0/Python/pyparallel.c#l2365.
All memory operations (PyObject_New/Malloc etc) get intercepted
during parallel thread execution and redirected to _PyHeap_Malloc(),
which is a very simple slab allocator. (No need for convoluted
buckets because we never free individual objects during parallel
execution; instead, we just blow everything away at the end.)
Trent.
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