Even with a zero overhead runloop a 20 times speed improvement in running typical non-trivial Python programs is simply not possible. It's not like the Python opcodes perform no work at all:
Performance Measurements for Pystone http://zope.org/Members/jeremy/CurrentAndFutureProjects/pystone
This'll quickly head down to a "Yes, it can!" "No, it can't!" sort of argument, so it's probably not worth going much further without actual benchmarks, but I'll say that I've good reason to not be surprised at the speedup, and I don't think that it'll be at all necessary to do type inferencing to get that sort of performance gain in specialized circumstances, of which pystone definitely is.
--- Dan Sugalski <[EMAIL PROTECTED]> wrote:> inferencing and whatnot'd likely get you a larger speedup.At 10:28 PM -0800 12/23/03, Joe Wilson wrote: >In order to get the 20x speed gain you seek I assume >that Parrot would have to perform some sort of variable >type inference to distinguish, for example, when a >scalar is really just an integer and use an integer register. >Otherwise, the PMCs in Parrot would perform much the same >as the Python scalars (or whatever Python calls them).
No, actually. Most of that speedup can come from a better runloop--python's core loop's rather inefficient. Full-on type
-- Dan
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