In part this is because a significant amount of memory is used by hidden classes,
In this research, we optimize the hidden class graph
to minimize their memory use.
Our solution collects the hidden class graph and related
information for an application in a profiling run, and optimizes
the graph offline.
We reduce the number of hidden
classes by avoiding introducing intermediate ones, for instance when properties are added one after another.
Our optimizations allow the VM to assign the most likely final hidden class to an object at its creation.
They also minimize re-allocation of storage for property values,
and reduce the polymorphism of inline caches.
offline optimization can eliminate 61.9% of the hidden classes on average.
It also improves execution speed by
minimizing the number of hidden class transitions for an object
and reducing inline cache misses.
Mon 5 DecDisplayed time zone: Auckland, Wellington change
15:30 - 17:00
| MMTk and The Case for Modular VM Development|
Steve Blackburn Google and Australian National University
Tomoharu Ugawa University of Tokyo, Stefan Marr University of Kent, Richard Jones University of KentDOI