Go in Linux Desktop Environment 2015年4月 夏彬 武汉深之度 Linux桌面环境 Gnome (Gtk) KDE (Qt) Lxde (Gtk) LxQt(Qt5) Xfce (Gtk) DDE (Gtk) ....... DE组件 Windows Manager Input Method Launcher Panel (dock)

Debugging the BPF Virtual Machine Lorenzo Fontana October 28, 2020 ● Debugging is useful to understand how things work ● Sometimes, eBPF programs can’t even load ● I couldn’t find good resources on this this, so, here I am ● I break lots of eBPF programs ● The BPF Virtual machine is not easy to understand Why ? The BPF subsystem lives in the kernel AND The kernel can be debugged using gdb The need: ● A kernel image ● A root filesystem ● An eBPF program that doesn’t work ● gdb First - The environment git clone https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git /source/linux

Rud Merriam | A Journey into Non-Virtual Polymorphism 2 Who Doesn’t Recognize This?? 1990 Borland Turbo C++Cppcon 2023 | Rud Merriam | A Journey into Non-Virtual Polymorphism 3 Background ● Experience – Medium.com (https://medium.com/@rudmerriam)Cppcon 2023 | Rud Merriam | A Journey into Non-Virtual Polymorphism 4 Polymorphism ● Greek: “many forms” (Obligatory statement) ● The use of a single variableCppcon 2023 | Rud Merriam | A Journey into Non-Virtual Polymorphism 5 Polymorphic Variables ● Base class pointer to derived class – Virtual functions are not bad! ● Standard Template Library

carePhoto by Tech Nick on unsplashSimple benchmark class Base { public: int concrete() const; virtual int virt() const; }; void benchmark(Base *b, size_t num_iterations) { auto start = Clock::now(); virt_duration = end-start;There are interesting technical details and surprising conclusions that virtual functions can be actually faster. Since CPU architectures are mentioned, I'd expect to see deep nt-vs-inheritance-vs-other- ways-performanceDoes it even matter?Conclusions ● The notion that “virtual functions are slower” is flat out wrong. ○ Which is not to say they are faster ○ Some of the suggested

Go runtime related problems in TiDB production environment About me ● Arthur Mao(毛康力), Senior Engineer@PingCAP ● TiDB core developer (top3 contributor) ● GitBook about golang internals (@tiancaiamao) Memory ● OS ○ Virtual memory ■ each process has its virtual address space ○ Physical memory ■ OS divides physical memory into pages ○ memory mapping ■ page fault, built the virtual-physical mapping talking about when we talk about Memory ● TLB (translation lookaside buffer) ○ A CPU cache for virtual memory to physical addresses mapping ○ Size limited, when cache miss the memory access become slower

name, const NodeConfig& config) : SyncActionNode(name, config) {} // You must override this virtual function NodeStatus tick() override { std::cout << "Type: [ApproachEnemy]. Instance:" <<

#IstioCon Is Your Virtual Machine Really Ready-to-go with Istio? Kailun Qin, Intel Haoyuan Ge #IstioCon Quick Summary (from Google Cloud Next ’19 [1]) VM works on Istio! [1] Istio Service Mesh Hybrid and Multi Clouds #IstioCon Istio VM Integration is? A Tumultuous Odyssey… [1] Istio 1.8: A Virtual Machine Integration Odyssey, Jimmy Song #IstioCon V0.2 Mesh Expansion ● Prerequisites ○ IP connectivity the workloads themselves #IstioCon V1.6-1.8 Better VM Workload Abstraction Item Kubernetes Virtual Machine Basic schedule unit Pod WorkloadEntry Component Deployment WorkloadGroup Service registry

#IstioCon Building resilient systems inside the mesh: abstraction and automation of Virtual Service generation Vladimir Georgiev, Thought Machine #IstioCon Sync calls failures inside the mesh implement this to be language agnostic? #IstioCon Virtual Services API ● Solves our problems, but… ● All Service Owners must be aware of the Virtual Services API in order to define their SLOs. ● Potential errors when dealing with YAMLs. ● Potential drift between the state of the service API and the Virtual Service config. ● Hard to manage when having hundreds of services. #IstioCon Abstracting to proto

to emit a warning. Any address/port combination appearing in multiple virtual hosts is implicitly treated as a name-based virtual host. mod_deflate will now skip compression if it knows that the size overhead of the default error string. mod_cgi, mod_include, mod_isapi, ... Translation of headers to environment variables is more strict than before to mitigate some possible cross-site-scripting attacks via silently dropped. Environment Variables in Apache has some pointers on how to work around broken legacy clients which require such headers. (This affects all modules which use these environment variables.)

to emit a warning. Any address/port combination appearing in multiple virtual hosts is implicitly treated as a name-based virtual host. mod_deflate will now skip compression if it knows that the size overhead of the default error string. mod_cgi, mod_include, mod_isapi, ... Translation of headers to environment variables is more strict than before to mitigate some possible cross-site-scripting attacks via silently dropped. Environment Variables in Apache has some pointers on how to work around broken legacy clients which require such headers. (This affects all modules which use these environment variables.)