Standardizing RPython - it's time.

Carl Friedrich Bolz cfbolz at
Wed Oct 13 11:33:40 CEST 2010

Hi John,

John Nagle <nagle <at>> writes:

>      All attempts to make the dialect defined by CPython significantly
> faster have failed.  PyPy did not achieve much of a speed
> improvement over CPython, and is sometimes slower.

This is not true. While PyPy is indeed sometimes slower than CPython, there is a
significant speedup for many synthetic and real-life benchmarks. PyPy with a JIT
is up to 20 times faster than CPython for synthetic benchmarks like richards,
but still something like 6 times faster for Django. It also beats Psyco in
almost all benchmarks. For detailed measurements, please visit our benchmarking

All these numbers are also only the current state, PyPy is still continuously


Carl Friedrich

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