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

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

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

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 1.1.2.1 QuickStart: Table API . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 1.1.2.2 QuickStart: DataStream . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 1.3.2.1 O1: How to prepare Python Virtual Environment . . . . . . . . . . . . . . . . . . . 24 1.3.2.2 O2: How to add Python Files . . . 26 1.3.4.1 O1: Could not find any factory for identifier ‘xxx’ that implements ‘org.apache.flink.table.factories.DynamicTableFactory’ in the classpath . . . . . . . 26 1.3.4.2 O2: ClassNotFoundException:

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 1.1.2.1 QuickStart: Table API . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 1.1.2.2 QuickStart: DataStream . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 1.3.2.1 O1: How to prepare Python Virtual Environment . . . . . . . . . . . . . . . . . . . 24 1.3.2.2 O2: How to add Python Files . . . 26 1.3.4.1 O1: Could not find any factory for identifier ‘xxx’ that implements ‘org.apache.flink.table.factories.DynamicTableFactory’ in the classpath . . . . . . . 26 1.3.4.2 O2: ClassNotFoundException:

SQLite Development with Zumero SQLite Development with Zumero Copyright © 2013 Zumero LLC iii Table of Contents 1. Introduction .................................................................... ................................................................. 5 3.7. Limitations of SQLite virtual tables .......................................................................... 5 3.7.1. Indexes ........................................................ 5 3.7.2. Adding columns to an existing table .............................................................. 6 3.7.3. Incremental blob I/O ...

Algorithm 238 Relaxed Rules for Specifying Table Distribution Columns 239 Resource Groups Features 239 PL/pgSQL Procedural Language Enhancements 239 Replicated Table Data 240 Concurrency Improvements in Requirements 263 Operating System 263 Storage 263 Security 264 Amazon Web Services (AWS) 264 Virtual Machine Type 264 Compute 264 Memory 264 Network 264 Storage 264 Elastic Block Storage (EBS) Ephemeral 265 AWS Recommendations 265 Master 265 Segments 265 Google Compute Platform (GCP) 266 Virtual Machine Type 266 VMware Greenplum 6 Documentation VMware, Inc 11 Compute 266 Memory 266 Network