agent figures out how to get from one location to another before actually moving. 8Cache-friendly design 9Cache-friendly design Program design focused on optimizing code by avoiding pathological affects computer system. 10Cache-friendly design - Random person on StackOverflow Modern memory pipelines are so complex you are basically optimizing for the cache 11Cache-friendly design 12Cache-friendly design design 13Cache-friendly design 14Cache-friendly design Accessing data means accessing memory through the cache 15Cache-friendly design Accessing data means accessing memory through the cache Running

Comm Cache Db Initialization Dependencies int main(int argc, char* argv[]) { ... Comm::init(); Cache::init(); Db::init(); ... }int main(int argc, char* argv[]) { ... Comm::init(); // oops Cache::init(); Cache::init(); Db::init(); ... } Bloomberg 44 Comm Cache Db Initialization Dependencies int main(int argc, char* argv[]) { ... Db::init(); // Correct Cache::init(); Comm::init(); ... }Bloomberg 45 class class CommWrapper { public: CommWrapper(CacheWrapper& cache):cache_(cache){...}; virtual Response send(const Request& req); private: CacheWrapper& cache_; }; Initialization DependenciesBloomberg 46 CacheWrapper&

classes, placing them in the self.modifiers list menus.menu_pool.MenuPool._build_nodes() checks the cache to see if it should return cached nodes loops over the Menus in self.menus (note: by default the only djangoproject.com/en/dev/topics/cache/ In your middleware settings be sure to add django.middleware.cache.UpdateCacheMiddleware at the first and django.middleware.cache.FetchFromCacheMiddleware at the of the request set the cache=False attribute on the plugin class: Warning If you disable a plugin cache be sure to restart the server and clear the cache afterwards. Content Cache Duration Default: 60 MIDDLEWARE=[

djangoproject.com/en/dev/topics/cache/ In your middleware settings be sure to add django.middleware.cache.UpdateCacheMiddleware at the first and django.middleware.cache.FetchFromCacheMiddleware at the the last position: MIDDLEWARE=[ 'django.middleware.cache.UpdateCacheMiddleware', ... 'cms.middleware.language.LanguageCookieMiddleware', 'cms.middleware.user.CurrentUserMiddleware' CurrentPageMiddleware', 'cms.middleware.toolbar.ToolbarMiddleware', 'django.middleware.cache.FetchFromCacheMiddleware', ], Plugins New in version 3.0. Normally all plugins will be cached

djangoproject.com/en/dev/topics/cache/ In your middleware settings be sure to add django.middleware.cache.UpdateCacheMiddleware at the first and django.middleware.cache.FetchFromCacheMiddleware at the the last position: MIDDLEWARE=[ 'django.middleware.cache.UpdateCacheMiddleware', ... 'cms.middleware.language.LanguageCookieMiddleware', 'cms.middleware.user.CurrentUserMiddleware' CurrentPageMiddleware', 'cms.middleware.toolbar.ToolbarMiddleware', 'django.middleware.cache.FetchFromCacheMiddleware', ], Plugins New in version 3.0. Normally all plugins will be cached

djangoproject.com/en/dev/topics/cache/ In your middleware settings be sure to add django.middleware.cache.UpdateCacheMiddleware at the first and django.middleware.cache.FetchFromCacheMiddleware at the the last position: MIDDLEWARE=[ 'django.middleware.cache.UpdateCacheMiddleware', ... 'cms.middleware.language.LanguageCookieMiddleware', 'cms.middleware.user.CurrentUserMiddleware', 'cms.middleware.page. CurrentPageMiddleware', 'cms.middleware.toolbar.ToolbarMiddleware', 'django.middleware.cache.FetchFromCacheMiddleware', ], Plugins New in version 3.0. Normally all plugins will be cached. If you have a

classes, placing them in the self.modifiers list menus.menu_pool.MenuPool._build_nodes() checks the cache to see if it should return cached nodes loops over the Menus in self.menus (note: by default the only djangoproject.com/en/dev/topics/cache/ In your middleware settings be sure to add django.middleware.cache.UpdateCacheMiddleware at the first and django.middleware.cache.FetchFromCacheMiddleware at the of the request set the cache=False attribute on the plugin class: Warning If you disable a plugin cache be sure to restart the server and clear the cache afterwards. Content Cache Duration Default: 60 MIDDLEWARE=[

djangoproject.com/en/dev/topics/cache/ In your middleware settings be sure to add django.middleware.cache.UpdateCacheMiddleware at the first and django.middleware.cache.FetchFromCacheMiddleware at the the last position: MIDDLEWARE=[ 'django.middleware.cache.UpdateCacheMiddleware', ... 'cms.middleware.language.LanguageCookieMiddleware', 'cms.middleware.user.CurrentUserMiddleware', 'cms.middleware.page. CurrentPageMiddleware', 'cms.middleware.toolbar.ToolbarMiddleware', 'django.middleware.cache.FetchFromCacheMiddleware', ], Plugins New in version 3.0. Normally all plugins will be cached. If you have a

djangoproject.com/en/dev/topics/cache/ In your middleware settings be sure to add django.middleware.cache.UpdateCacheMiddleware at the first and django.middleware.cache.FetchFromCacheMiddleware at the the last position: MIDDLEWARE_CLASSES=[ 'django.middleware.cache.UpdateCacheMiddleware', ... 'cms.middleware.language.LanguageCookieMiddleware', 'cms.middleware.user.CurrentUserMiddleware', 'cms.middleware middleware.page.CurrentPageMiddleware', 'cms.middleware.toolbar.ToolbarMiddleware', 'django.middleware.cache.FetchFromCacheMiddleware', ], Plugins New in version 3.0. Normally all plugins will be cached. If you

Curve⽂件系统性能 ⽹易数帆科技 向东提纲 • 什么是Curve • Curve的应⽤场景及挑战 • Curve客户端⾯临问题及分析 • 什么是ebpf • 基于epbf的Curve Cache设计 • Curve社区介绍Curve是什么？ • Curve云原⽣软件定义存储 • Curve分布式块存储 • Curve分布式⽂件存储 • ⾼性能、易运维、云原⽣Curve⽂件系统框架和主要应⽤场景 Daemon⼤概10us以内 • 瓶颈在/dev/fuse通讯开销基于FUSE可能的优化点 • 降低内核与libfuse通讯延迟 • 基于⽂件属性的操作内核直接返回？ • 基于⽂件数据的操作先内核读写 cache？实现POSIX兼容API途径及问题 • 基于FUSE的实现 • curve / ceph / gluster • LD_PRELOAD重载⽂件系统系统调⽤ • vpp / f-stack 进程共享内存通信延迟10us+ • others 开销 10us+ • fuse_ll_ops开销10us-基于FUSE的优化框架 • 框架优化的要点 • 共享inode cache • 共享data cache的映射 • GETATTR流程 • ⽂件读取流程 • 相关⼯作 • extFUSE • google android12 passthrough什么是eBPF