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：
fromgit_tools.git_toolimportget_collect_projects,QQNews_Git
fromthreadingimportThread,Lock
importdatetime
base_url="http://git.xx.com"
project_members_commits_lang_info={}
lock=Lock()
threads=[]
'''
Author:zenkilan
'''
defcount_time(func):
deftook_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__}executiontookuptime:{took_up_time}")
returnret
returntook_up_time
defget_project_member_lang_code_lines(git,member,begin_date,end_date):
globalproject_members_commits_lang_info
globallock
member_name=member["username"]
r=git.get_user_info(member_name)
ifnotr["id"]:
return
user_commits_lang_info=git.get_commits_user_lang_diff_between(r["id"],begin_date,end_date)
iflen(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()
defget_project_lang_code_lines(project,begin_date,end_date):
globalthreads
git=QQNews_Git(project[1],base_url,project[0])
project_members=git.get_project_members()
iflen(project_members)==0:
return
formemberinproject_members:
thread=Thread(target=get_project_member_lang_code_lines,args=(git,member,begin_date,end_date))
threads.append(thread)
thread.start()
@count_time
defget_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:
"""
globalproject_members_commits_lang_info
globalthreads
forprojectinget_collect_projects():
thread=Thread(target=get_project_lang_code_lines,args=(project,begin_date,end_date))
threads.append(thread)
thread.start()
@count_time
defget_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={}
forprojectinget_collect_projects():
git=QQNews_Git(project[1],base_url,project[0])
project_members=git.get_project_members()
user_commits_lang_info_dict={}
iflen(project_members)==0:
continue
formemberinproject_members:
member_name=member["username"]
r=git.get_user_info(member_name,debug=False)
ifnotr["id"]:
continue
try:
user_commits_lang_info=git.get_commits_user_lang_diff_between(r["id"],begin_date,end_date)
iflen(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
returnproject_members_commits_lang_info
deftest_results_equal(resultA,resultB):
"""
测试方法
:paramresultA:
:paramresultB:
:return:
"""
print(resultA)
print(resultB)
assertlen(str(resultA))==len(str(resultB))
if__name__=='__main__':
fromgit_tools.configimportbegin_date,end_date
get_projects_lang_code_lines(begin_date,end_date)
fortinthreads:
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_linesexecutiontookuptime:1.85294
get_projects_lang_code_lines_oldexecutiontookuptime:108.604177
速度提升了约58倍
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