Hi,
I've found a small example where PyPy is a *lot* slower (more than 4x)
than CPython. The example calculates all the possible groupings of a
list of values:
---/---
def allgroup(expansions, n=0, groups = []):
expgroup = [expansions[n]]
if n == len(expansions) - 1:
yield groups + [expgroup]
for i in xrange(len(groups)):
tmp = groups[i]
groups[i] = tmp + expgroup
yield groups
groups[i] = tmp
else:
for g in allgroup(expansions, n+1, groups + [expgroup]):
yield g
for i in xrange(len(groups)):
tmp = groups[i]
groups[i] = tmp + expgroup
for g in allgroup(expansions, n + 1, groups):
yield g
groups[i] = tmp
count = 0
for i in allgroup(range(13)):
count += 1
print count
---/---
time python allgroups.py
20.75s user 0.04s system 99% cpu 20.820 total
time pypy allgroups.py
97.31s user 1.07s system 99% cpu 1:38.55 total
Regards,
l.
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