[pypy-dev] Spurious dict lookups in my JIT loops

Armin Rigo arigo at tunes.org
Sun Sep 18 09:56:26 CEST 2011

Hi Boris,

All machine code instructions produced by the JIT have a place that
they code from in your RPython code.  In this case I suspect that it's
from self.compare(), but again, it's a bit hard to know without having
access to the complete source code.

Alternatively, there is a way to display where the operations come
from, but only during testing.  You might rewrite your example as a
test --- as opposed to, I suppose, a targetxxx.py.  See the infinite
amount of tiny examples in pypy/jit/metainterp/test/test_*.py, e.g.
test_ajit.py.  Write a new file in the same directory.  The point is
then that you can run the test with "python test_all.py
test_yourfile.py --viewloops".  It reports the same traces, but
organized as a call graph and with the origin shown before every

A bientôt,


More information about the pypy-dev mailing list