In the interest of fixing
http://trac.cython.org/cython_trac/ticket/281
I'm doing some benchmarks which are rather surprising to me.
Explanations? Unless something is wrong it seems I can safely replace
__pyx_lineno and friends with thread variables (on Python versions which
support it, haven't checked that yet).
In [12]: %timeit dagss.globalvar(1e3)
100 loops, best of 3: 6.18 ms per loop
In [13]: %timeit dagss.threadvar(1e3)
10000 loops, best of 3: 553 micros per loop
In [14]: %timeit dagss.threadvar(1e6)
10 loops, best of 3: 153 ms per loop
cdef extern from "pythread.h":
int PyThread_create_key()
void PyThread_delete_key(int)
int PyThread_set_key_value(int, void *)
void* PyThread_get_key_value(int)
void PyThread_delete_key_value(int key)
cdef int v
cdef void setvar(int x):
global v
v = x
cdef int getvar():
return v
def threadvar(N):
cdef int key = PyThread_create_key()
cdef int i
cdef void* j
for i in range(N):
PyThread_set_key_value(key, <void*>i)
j = PyThread_get_key_value(key)
def globalvar(N):
cdef int i
cdef int j
for i in range(N):
setvar(i)
j = getvar()
--
Dag Sverre
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