優化前后新老代碼如下：
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from git_tools.git_tool import get_collect_projects, QQNews_Gitfrom threading import Thread, Lockimport datetimebase_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_timedef 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_timedef get_projects_lang_code_lines(begin_date, end_date): """ 獲取項目代碼行語言相關統計——新方法（提升效率） 應用多線程替代for循環 并發訪問共享外部資源 :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_timedef get_projects_lang_code_lines_old(begin_date, end_date): """ 獲取項目代碼行語言相關統計——老方法（耗時嚴重） 使用最基本的思路進行編程 雙層for循環嵌套并且每層都包含耗時操作 :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_infodef test_results_equal(resultA, resultB): """ 測試方法 :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) |
老方法里外層for循環和內層for循環里均存在耗時操作：
1）git.get_project_members()
2）git.get_user_info(member_name, debug=False)
分兩步來優化，先里后外或先外后里都行。用多線程替換for循環，并發共享外部資源，加鎖避免寫沖突。
測試結果通過，函數運行時間裝飾器顯示（單位秒）：
get_projects_lang_code_lines execution took up time:1.85294
get_projects_lang_code_lines_old execution took up time:108.604177
速度提升了約58倍
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
原文鏈接：https://www.cnblogs.com/LanTianYou/p/11498525.html
