如何使用python多线程_Python3如何使用多线程升程序运行速度

优化前后新老代码如下：

from git_tools.git_tool import get_collect_projects, QQNews_Git

from threading import Thread, Lock

import datetime

base_url = "http://git.xx.com"

project_members_commits_lang_info = {}

lock = Lock()

threads = []

'''

Author:zenkilan

'''

def count_time(func):

def took_up_time(*args, **kwargs):

start_time = datetime.datetime.now()

ret = func(*args, **kwargs)

end_time = datetime.datetime.now()

took_up_time = (end_time - start_time).total_seconds()

print(f"{func.__name__} execution took up time:{took_up_time}")

return ret

return took_up_time

def get_project_member_lang_code_lines(git, member, begin_date, end_date):

global project_members_commits_lang_info

global lock

member_name = member["username"]

r = git.get_user_info(member_name)

if not r["id"]:

return

user_commits_lang_info = git.get_commits_user_lang_diff_between(r["id"], begin_date, end_date)

if len(user_commits_lang_info) == 0:

return

lock.acquire()

project_members_commits_lang_info.setdefault(git.project, dict())

project_members_commits_lang_info[git.project][member_name] = user_commits_lang_info

lock.release()

def get_project_lang_code_lines(project, begin_date, end_date):

global threads

git = QQNews_Git(project[1], base_url, project[0])

project_members = git.get_project_members()

if len(project_members) == 0:

return

for member in project_members:

thread = Thread(target=get_project_member_lang_code_lines, args=(git, member, begin_date, end_date))

threads.append(thread)

thread.start()

@count_time

def get_projects_lang_code_lines(begin_date, end_date):

"""

获取项目代码行语言相关统计——新方法（提升效率）

应用多线程替代for循环

并发访问共享外部资源

:return:

"""

global project_members_commits_lang_info

global threads

for project in get_collect_projects():

thread = Thread(target=get_project_lang_code_lines, args=(project, begin_date, end_date))

threads.append(thread)

thread.start()

@count_time

def get_projects_lang_code_lines_old(begin_date, end_date):

"""

获取项目代码行语言相关统计——老方法（耗时严重）

使用最基本的思路进行编程

双层for循环嵌套并且每层都包含耗时操作

:return:

"""

project_members_commits_lang_info = {}

for project in get_collect_projects():

git = QQNews_Git(project[1], base_url, project[0])

project_members = git.get_project_members()

user_commits_lang_info_dict = {}

if len(project_members) == 0:

continue

for member in project_members:

member_name = member["username"]

r = git.get_user_info(member_name, debug=False)

if not r["id"]:

continue

try:

user_commits_lang_info = git.get_commits_user_lang_diff_between(r["id"], begin_date, end_date)

if len(user_commits_lang_info) == 0:

continue

user_commits_lang_info_dict[member_name] = user_commits_lang_info

project_members_commits_lang_info[git.project] = user_commits_lang_info_dict

except:

pass

return project_members_commits_lang_info

def test_results_equal(resultA, resultB):

"""

测试方法

:param resultA:

:param resultB:

:return:

"""

print(resultA)

print(resultB)

assert len(str(resultA)) == len(str(resultB))

if __name__ == '__main__':

from git_tools.config import begin_date, end_date

get_projects_lang_code_lines(begin_date, end_date)

for t in threads:

t.join()

old_result = get_projects_lang_code_lines_old(begin_date, end_date)

test_results_equal(old_result, project_members_commits_lang_info)

老方法里外层for循环和内层for循环里均存在耗时操作：

1）git.get_project_members()

2）git.get_user_info(member_name, debug=False)

分两步来优化，先里后外或先外后里都行。用多线程替换for循环，并发共享外部资源，加锁避免写冲突。

测试结果通过，函数运行时间装饰器显示（单位秒）：

get_projects_lang_code_lines execution took up time:1.85294

get_projects_lang_code_lines_old execution took up time:108.604177

速度提升了约58倍

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