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#!/usr/bin/env python
"""
Create a chain of coroutines and pass a value from one end to the
other, where each coroutine will increment the value before passing it
along.
"""
import pyperf
import greenlet
def link(next_greenlet):
value = greenlet.getcurrent().parent.switch()
next_greenlet.switch(value + 1)
CHAIN_GREENLET_COUNT = 100000
def bm_chain(loops):
begin = pyperf.perf_counter()
for _ in range(loops):
start_node = greenlet.getcurrent()
for _ in range(CHAIN_GREENLET_COUNT):
g = greenlet.greenlet(link)
g.switch(start_node)
start_node = g
x = start_node.switch(0)
assert x == CHAIN_GREENLET_COUNT
end = pyperf.perf_counter()
return end - begin
GETCURRENT_INNER_LOOPS = 10
def bm_getcurrent(loops):
getcurrent = greenlet.getcurrent
getcurrent() # Factor out the overhead of creating the initial main greenlet
begin = pyperf.perf_counter()
for _ in range(loops):
# Manual unroll
getcurrent()
getcurrent()
getcurrent()
getcurrent()
getcurrent()
getcurrent()
getcurrent()
getcurrent()
getcurrent()
getcurrent()
end = pyperf.perf_counter()
return end - begin
SWITCH_INNER_LOOPS = 10000
def bm_switch(loops):
class G(greenlet.greenlet):
other = None
def run(self):
o = self.other
for _ in range(SWITCH_INNER_LOOPS):
o.switch()
begin = pyperf.perf_counter()
for _ in range(loops):
gl1 = G()
gl2 = G()
gl1.other = gl2
gl2.other = gl1
gl1.switch()
end = pyperf.perf_counter()
return end - begin
CREATE_INNER_LOOPS = 10
def bm_create(loops):
gl = greenlet.greenlet
begin = pyperf.perf_counter()
for _ in range(loops):
gl()
gl()
gl()
gl()
gl()
gl()
gl()
gl()
gl()
gl()
end = pyperf.perf_counter()
return end - begin
if __name__ == '__main__':
runner = pyperf.Runner()
runner.bench_time_func(
'create a greenlet',
bm_create,
inner_loops=CREATE_INNER_LOOPS
)
runner.bench_time_func(
'switch between two greenlets',
bm_switch,
inner_loops=SWITCH_INNER_LOOPS
)
runner.bench_time_func(
'getcurrent single thread',
bm_getcurrent,
inner_loops=GETCURRENT_INNER_LOOPS
)
runner.bench_time_func(
'chain(%s)' % CHAIN_GREENLET_COUNT,
bm_chain,
)
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