Python 如何并行化复杂的for循环
我有一个复杂的Python 如何并行化复杂的for循环,python,for-loop,parallel-processing,Python,For Loop,Parallel Processing,我有一个复杂的for循环,它包含对循环中多个记录的多个操作。循环如下所示: for i,j,k in zip(is,js,ks): #declare multiple lists.. like a = [] b = [] #... if i: for items in i: values = items['key'].split("--") #append the values to the
for
循环,它包含对循环中多个记录的多个操作。循环如下所示:
for i,j,k in zip(is,js,ks):
#declare multiple lists.. like
a = []
b = []
#...
if i:
for items in i:
values = items['key'].split("--")
#append the values to the declared lists
a.append(values[0])
b.append(values[1])
# also other operations with j and k where are is a list of dicts.
if "substring" in k:
for k, v in j["key"].items():
l = "string"
t = v
else:
for k, v in j["key2"].items():
l = k
t = v
# construct an object with all the lists/params
content = {
'sub_content': {
"a":a,
"b":b,
.
.
}
}
#form a tuple. We are interested in this tuple.
data_tuple = (content,t,l)
考虑到上面的for
循环,我如何将其并行化?我已经研究过多处理,但还没有能够并行化如此复杂的循环。我也愿意接受一些可能在这里表现更好的建议,包括OpenMP/MPI/OpenACC等并行语言范例。您可以使用Python库。如中所述,您应该确定是需要多处理还是多线程
底线:如果需要多线程,则应使用multiprocessing.dummy。如果您只执行CPU密集型任务,而没有IO/依赖项,则可以使用多处理
multiprocessing.dummy与multiprocessing模块完全相同,
而是使用线程(一个重要的区别——使用多线程)
CPU密集型任务的进程;IO(和IO期间)的线程:
设置zip对象
简单示例函数
设置多线程。
你的全部例子
您可以添加一个示例来演示相同的功能吗?@Eswar-请对此进行测试,看看return语句
return(content,t,l)
是否正确。如果my\u函数没有返回任何内容,则池是否返回一些内容?我可以运行pool.map(my_func,zip_object)吗?小心命名变量is
,因为它已经是Python语句了。我在设置测试时遇到了这个问题:-)-Guimoute我在帖子中更改的变量。否则,名称将根据其相关性而定。
#!/usr/bin/env python3
import numpy as np
n = 2000
xs = np.arange(n)
ys = np.arange(n) * 2
zs = np.arange(n) * 3
zip_obj = zip(xs, ys, zs)
def my_function(my_tuple):
iv, jv, kv = my_tuple
return f"{str(iv)}-{str(jv)}-{str(kv)}"
from multiprocessing.dummy import Pool as ThreadPool
pool = ThreadPool(4)
data_tuple = pool.map(my_function, zip_obj)
def my_function(my_tuple):
i, j, k = my_tuple
#declare multiple lists.. like
a = []
b = []
#...
if (i):
for items in i:
values = items['key'].split("--")
#append the values to the declared lists
a.append(values[0])
b.append(values[1])
#also other ooperations with j and k where are is a list of dicts.
if ("substring" in k):
for k, v in j["key"].items():
l = "string"
t = v
else:
for k, v in j["key2"].items():
l = k
t = v
#construct an object called content with all the lists/params like
content = {
'sub_content': {
"a":a,
"b":b,
.
.
}
}
#form a tuple. We are interested in this tuple.
return (content,t,l)
from multiprocessing.dummy import Pool as ThreadPool
pool = ThreadPool(4)
zip_obj = zip(is,js,ks)
data_tuple = pool.map(my_function, zip_obj)
# Do whatever you need to do w/ data_tuple here