Unexpectedly bad performance of stackless and greenlet on PyPy

test_channel_stackless.py

# according to this benchmark stackless.channel is 100x slower on PyPy compared to Stackless
"""
Stackless result:

$ stackless2.7-static test_channel_stackless.py 
1000000 send took 0.397s

Stackless version:

$ stackless2.7-static 
Python 2.7.1 Stackless 3.1b3 060516 (release27-maint, Oct 30 2011, 11:49:35) 
[GCC 4.1.2] on linux2

PyPy result:

$ ~/src/pypy-2.0-beta1/bin/pypy test_channel_stackless.py 
1000000 send took 49.354s

PyPy version:

$ ~/src/pypy-2.0-beta1/bin/pypy 
Python 2.7.3 (7e4f0faa3d51, Nov 16 2012, 16:56:51)
[PyPy 2.0.0-beta1 with GCC 4.4.3] on linux2
"""

import stackless
from time import time

N = 1000 * 1000
count = N


def func(ch):
    global count
    while count > 0:
        ch.send(ch.receive())
        count -= 1


ch = stackless.channel()
start = time()
stackless.tasklet(func)(ch)
ch.send(True)
stackless.tasklet(func)(ch)
stackless.run()
took = time() - start
assert not count, count
print '%s send took %.3fs' % (N, took)

test_switch.py

# according to this benchmark greenlet is 20x times slower on PyPy than it is on CPython
"""
CPython result:

$ python test_switch.py 
1000000 switches took 0.404s

CPython version:

$ python 
Python 2.7.3 (default, Aug  1 2012, 05:16:07) 
[GCC 4.6.3] on linux2

PyPy result:

$ ~/src/pypy-2.0-beta1/bin/pypy test_switch.py 
1000000 switches took 9.338s

PyPy version:

$ ~/src/pypy-2.0-beta1/bin/pypy 
Python 2.7.3 (7e4f0faa3d51, Nov 16 2012, 16:56:51)
[PyPy 2.0.0-beta1 with GCC 4.4.3] on linux2
"""

import greenlet
from time import time


N = 1000 * 1000
count = N


def func(next):
    global count
    while count > 0:
        next.switch()
        count -= 1


g1 = greenlet.greenlet(func)
main = greenlet.getcurrent()

start = time()
while count > 0:
    g1.switch(main)
    count -= 1

took = time() - start
assert count <= 0, count
print ('%s switches took %.3fs' % (N, took))

using pypy's jitframe-on-heap branch pypy is a bit faster on my machine:

$ ./pypy-jitframe-on-heap-2013-02-06/bin/pypy test_switch.py
1000000 switches took 0.209s
$ python test_switch.py                                     
1000000 switches took 0.361s